diff --git a/.github/check_entitlements.sh b/.github/check_entitlements.sh
index 401f7bf..58590ac 100755
--- a/.github/check_entitlements.sh
+++ b/.github/check_entitlements.sh
@@ -17,7 +17,6 @@ echo ""
 
 get_token() {
     curl -k --location "$TOKEN_URL" \
-    --header "X-VirtruPubKey;" \
     --header "Content-Type: application/x-www-form-urlencoded" \
     --data-urlencode "grant_type=client_credentials" \
     --data-urlencode "client_id=$OTDF_CLIENT" \
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 620ed7d..677eb43 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -34,7 +34,7 @@ repos:
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: v0.12.12
+    rev: v0.13.1
     hooks:
       # Run the linter.
       - id: ruff-check
diff --git a/README.md b/README.md
index 60be913..719a221 100644
--- a/README.md
+++ b/README.md
@@ -95,8 +95,6 @@ decrypted_data = tdf_reader.payload
 with open("decrypted.txt", "wb") as f:
     f.write(decrypted_data)
 
-# Don't forget to close the SDK when done
-sdk.close()
 ```
 
 ## Project Structure
diff --git a/otdf-python-proto/README.md b/otdf-python-proto/README.md
index 2e4c102..4e04f07 100644
--- a/otdf-python-proto/README.md
+++ b/otdf-python-proto/README.md
@@ -17,7 +17,7 @@ See [CONNECT_RPC.md](../docs/CONNECT_RPC.md) for additional information.
 ## Structure
 
 - `proto-files/`: Contains the raw .proto files downloaded from the OpenTDF platform
-- `generated/`: Contains the generated Python protobuf and Connect RPC client files
+- `src/otdf_python_proto/`: Contains the generated Python protobuf and Connect RPC client files
 - `scripts/`: Contains build scripts for generating protobuf and Connect RPC files
 - `buf.yaml`: Buf configuration for proto validation and management
 - `buf.gen.yaml`: Buf generation configuration for Connect RPC and protobuf
@@ -40,10 +40,10 @@ Or use the convenience script:
 ```
 
 This generates:
-- `generated/*_connect.py` - Connect RPC clients (preferred)
-- `generated/*_pb2.py` - Standard protobuf classes
-- `generated/*_pb2.pyi` - Type stubs for better IDE support
-- `generated/legacy_grpc/*_pb2_grpc.py` - Legacy gRPC clients (backward compatibility)
+- `src/otdf_python_proto/**/*_connect.py` - Connect RPC clients (preferred)
+- `src/otdf_python_proto/**/*_pb2.py` - Standard protobuf classes
+- `src/otdf_python_proto/**/*_pb2.pyi` - Type stubs for better IDE support
+- `src/otdf_python_proto/legacy_grpc/**/*_pb2_grpc.py` - Legacy gRPC clients (backward compatibility)
 
 ### Legacy gRPC Generation
 
diff --git a/otdf-python-proto/scripts/generate_connect_proto.py b/otdf-python-proto/scripts/generate_connect_proto.py
index ff0d0d8..111cd81 100644
--- a/otdf-python-proto/scripts/generate_connect_proto.py
+++ b/otdf-python-proto/scripts/generate_connect_proto.py
@@ -96,10 +96,10 @@ def copy_opentdf_proto_files(proto_gen_dir: Path) -> bool:
                     print(f"  Copying {relative_path}...")
 
                     # Copy the file content
-                    with open(proto_file) as src:
+                    with proto_file.open() as src:
                         content = src.read()
 
-                    with open(dest_path, "w") as dst:
+                    with dest_path.open("w") as dst:
                         dst.write(content)
 
                     copied_files += 1
@@ -155,7 +155,7 @@ def run_buf_generate(proto_gen_dir: Path) -> bool:
 
         # Update buf.gen.yaml with the correct path
         buf_gen_path = proto_gen_dir / "buf.gen.yaml"
-        with open(buf_gen_path) as f:
+        with buf_gen_path.open() as f:
             content = f.read()
 
         # Replace the local plugin path
@@ -163,7 +163,7 @@ def run_buf_generate(proto_gen_dir: Path) -> bool:
             "- local: protoc-gen-connect_python", f"- local: {connect_plugin_path}"
         )
 
-        with open(buf_gen_path, "w") as f:
+        with buf_gen_path.open("w") as f:
             f.write(updated_content)
 
         # Run buf generate
@@ -221,7 +221,7 @@ def _fix_ignore_if_default_value(proto_files_dir):
     # Iterate all .proto files in the directory
     for proto_file in proto_files_dir.glob("**/*.proto"):
         try:
-            with open(proto_file, "r") as file:  # noqa: UP015
+            with proto_file.open("r") as file:
                 content = file.read()
 
             # Replace the old enum value with the new one
@@ -230,7 +230,7 @@ def _fix_ignore_if_default_value(proto_files_dir):
             )
 
             # Write the updated content back to the file
-            with open(proto_file, "w") as file:
+            with proto_file.open("w") as file:
                 file.write(updated_content)
 
             print(f"Updated {proto_file.name} to use IGNORE_IF_ZERO_VALUE")
diff --git a/pyproject.toml b/pyproject.toml
index 5a7cb92..e82c17e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,6 +73,7 @@ lint.select = [
     "I",
     # Performance-related rules
     "PERF",      # Ruff's performance rules
+    "PTH",       # pathlib (path handling)
     # Additional useful rules
     "UP",        # pyupgrade (modern Python features)
     "SIM",       # flake8-simplify (simplifications)
diff --git a/src/otdf_python/cli.py b/src/otdf_python/cli.py
index 48a1019..863d006 100644
--- a/src/otdf_python/cli.py
+++ b/src/otdf_python/cli.py
@@ -88,7 +88,7 @@ def load_client_credentials(creds_file_path: str) -> tuple[str, str]:
                 "CRITICAL", f"Credentials file does not exist: {creds_file_path}"
             )
 
-        with open(creds_path) as f:
+        with creds_path.open() as f:
             creds = json.load(f)
 
         client_id = creds.get("clientId")
@@ -223,13 +223,13 @@ def cmd_encrypt(args):
 
     try:
         # Read input file
-        with open(input_path, "rb") as input_file:
+        with input_path.open("rb") as input_file:
             payload = input_file.read()
 
         # Determine output
         if args.output:
             output_path = Path(args.output)
-            with open(output_path, "wb") as output_file:
+            with output_path.open("wb") as output_file:
                 try:
                     # Create appropriate config based on container type
                     container_type = getattr(args, "container_type", "tdf")
@@ -247,7 +247,7 @@ def cmd_encrypt(args):
                         logger.debug("Creating TDF")
                         config = create_tdf_config(sdk, args)
                         output_stream = BytesIO()
-                        manifest, size, _ = sdk.create_tdf(
+                        _manifest, size, _ = sdk.create_tdf(
                             BytesIO(payload), config, output_stream
                         )
                         output_file.write(output_stream.getvalue())
@@ -274,7 +274,7 @@ def cmd_encrypt(args):
                 logger.debug("Creating TDF")
                 config = create_tdf_config(sdk, args)
                 output_stream = BytesIO()
-                manifest, size, _ = sdk.create_tdf(
+                _manifest, size, _ = sdk.create_tdf(
                     BytesIO(payload), config, output_stream
                 )
                 output_file.write(output_stream.getvalue())
@@ -296,13 +296,13 @@ def cmd_decrypt(args):
 
     try:
         # Read encrypted file
-        with open(input_path, "rb") as input_file:
+        with input_path.open("rb") as input_file:
             encrypted_data = input_file.read()
 
         # Determine output
         if args.output:
             output_path = Path(args.output)
-            with open(output_path, "wb") as output_file:
+            with output_path.open("wb") as output_file:
                 try:
                     # Try to determine if it's a NanoTDF or regular TDF
                     # NanoTDFs have a specific header format, regular TDFs are ZIP files
@@ -359,7 +359,7 @@ def cmd_inspect(args):
 
         try:
             # Read encrypted file
-            with open(input_path, "rb") as input_file:
+            with input_path.open("rb") as input_file:
                 encrypted_data = input_file.read()
 
             if encrypted_data.startswith(b"PK"):
@@ -400,7 +400,7 @@ def cmd_inspect(args):
     except Exception as e:
         # If we can't inspect due to auth issues, show what we can
         logger.warning(f"Limited inspection due to: {e}")
-        with open(input_path, "rb") as input_file:
+        with input_path.open("rb") as input_file:
             encrypted_data = input_file.read()
 
         file_type = "TDF" if encrypted_data.startswith(b"PK") else "NanoTDF"
diff --git a/src/otdf_python/header.py b/src/otdf_python/header.py
index df7186d..2f6654d 100644
--- a/src/otdf_python/header.py
+++ b/src/otdf_python/header.py
@@ -51,7 +51,7 @@ def peek_length(buffer: bytes) -> int:
         # MAGIC_NUMBER_AND_VERSION (3 bytes)
         offset += 3
         # ResourceLocator
-        kas_locator, kas_size = ResourceLocator.from_bytes_with_size(buffer[offset:])
+        _kas_locator, kas_size = ResourceLocator.from_bytes_with_size(buffer[offset:])
         offset += kas_size
         # ECC mode (1 byte)
         ecc_mode = ECCMode(buffer[offset])
@@ -59,7 +59,7 @@ def peek_length(buffer: bytes) -> int:
         # Payload config (1 byte)
         offset += 1
         # PolicyInfo
-        policy_info, policy_size = PolicyInfo.from_bytes_with_size(
+        _policy_info, policy_size = PolicyInfo.from_bytes_with_size(
             buffer[offset:], ecc_mode
         )
         offset += policy_size
diff --git a/src/otdf_python/nanotdf.py b/src/otdf_python/nanotdf.py
index d8a063e..15d7725 100644
--- a/src/otdf_python/nanotdf.py
+++ b/src/otdf_python/nanotdf.py
@@ -300,7 +300,7 @@ def create_nano_tdf(
         iv, ciphertext = self._encrypt_payload(payload, key)
 
         # Wrap key if needed
-        wrapped_key, kas_public_key = self._wrap_key_if_needed(key, config)
+        wrapped_key, _kas_public_key = self._wrap_key_if_needed(key, config)
 
         # Compose the complete NanoTDF: [IV][CIPHERTEXT][WRAPPED_KEY][WRAPPED_KEY_LEN]
         if wrapped_key:
diff --git a/src/otdf_python/sdk_builder.py b/src/otdf_python/sdk_builder.py
index ead42f5..9f4f5e4 100644
--- a/src/otdf_python/sdk_builder.py
+++ b/src/otdf_python/sdk_builder.py
@@ -4,9 +4,9 @@
 """
 
 import logging
-import os
 import ssl
 from dataclasses import dataclass
+from pathlib import Path
 from typing import Any
 
 import httpx
@@ -77,9 +77,10 @@ def ssl_context_from_directory(self, certs_dir_path: str) -> "SDKBuilder":
         self.cert_paths = []
 
         # Find all .pem and .crt files in the directory
-        for filename in os.listdir(certs_dir_path):
-            if filename.endswith(".pem") or filename.endswith(".crt"):
-                self.cert_paths.append(os.path.join(certs_dir_path, filename))
+        certs_path = Path(certs_dir_path)
+        for cert_file in certs_path.iterdir():
+            if cert_file.suffix in (".pem", ".crt"):
+                self.cert_paths.append(str(cert_file))
 
         # Create SSL context with these certificates
         if self.cert_paths:
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index 88525ef..8cf0d77 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -20,7 +20,7 @@ def temp_credentials_file():
     with tempfile.TemporaryDirectory() as temp_dir:
         creds_file = Path(temp_dir) / "creds.json"
         creds_data = {"clientId": "opentdf", "clientSecret": "secret"}
-        with open(creds_file, "w") as f:
+        with creds_file.open("w") as f:
             json.dump(creds_data, f)
         yield creds_file
 
diff --git a/tests/integration/otdfctl_only/test_otdfctl_generated_fixtures.py b/tests/integration/otdfctl_only/test_otdfctl_generated_fixtures.py
index ccff47c..112d804 100644
--- a/tests/integration/otdfctl_only/test_otdfctl_generated_fixtures.py
+++ b/tests/integration/otdfctl_only/test_otdfctl_generated_fixtures.py
@@ -48,7 +48,7 @@ def test_sample_file_contents(sample_input_files):
     # Check text file has content
     text_file = sample_input_files["text"]
     assert text_file.exists(), f"Text file should exist: {text_file}"
-    with open(text_file) as f:
+    with text_file.open() as f:
         content = f.read()
     assert "Hello, World!" in content
     assert len(content) > 0
@@ -66,7 +66,7 @@ def test_sample_file_contents(sample_input_files):
     # Check attributes file has content
     attr_file = sample_input_files["with_attributes"]
     assert attr_file.exists(), f"Attributes file should exist: {attr_file}"
-    with open(attr_file) as f:
+    with attr_file.open() as f:
         content = f.read()
     assert "Classification: SECRET" in content
 
diff --git a/tests/integration/otdfctl_to_python/test_cli_comparison.py b/tests/integration/otdfctl_to_python/test_cli_comparison.py
index d5d428a..cc7fd54 100644
--- a/tests/integration/otdfctl_to_python/test_cli_comparison.py
+++ b/tests/integration/otdfctl_to_python/test_cli_comparison.py
@@ -32,7 +32,7 @@ def test_otdfctl_encrypt_python_decrypt(
         # Create input file
         input_file = temp_path / "input.txt"
         input_content = "Hello, World! This is a test for otdfctl decrypt comparison."
-        with open(input_file, "w") as f:
+        with input_file.open("w") as f:
             f.write(input_content)
 
         # Define TDF file created by otdfctl
@@ -115,7 +115,7 @@ def test_otdfctl_encrypt_otdfctl_decrypt(collect_server_logs, temp_credentials_f
         input_content = (
             "Hello, World! This is a test for otdfctl roundtrip encryption/decryption."
         )
-        with open(input_file, "w") as f:
+        with input_file.open("w") as f:
             f.write(input_content)
 
         # Define TDF file and decrypted output
diff --git a/tests/integration/otdfctl_to_python/test_tdf_reader_integration.py b/tests/integration/otdfctl_to_python/test_tdf_reader_integration.py
index 5ff6118..457b25f 100644
--- a/tests/integration/otdfctl_to_python/test_tdf_reader_integration.py
+++ b/tests/integration/otdfctl_to_python/test_tdf_reader_integration.py
@@ -33,7 +33,7 @@ def test_read_otdfctl_created_tdf_structure(
             # Create input file
             input_file = temp_path / "input.txt"
             input_content = "Hello, World! This is test data for TDFReader integration."
-            with open(input_file, "w") as f:
+            with input_file.open("w") as f:
                 f.write(input_content)
 
             # Define output files
@@ -60,7 +60,7 @@ def test_read_otdfctl_created_tdf_structure(
             assert otdfctl_output.stat().st_size > 0, "otdfctl created empty TDF file"
 
             # Test that TDFReader can open and read the structure
-            with open(otdfctl_output, "rb") as f:
+            with otdfctl_output.open("rb") as f:
                 tdf_data = f.read()
 
             # Initialize TDFReader
@@ -116,7 +116,7 @@ def test_read_otdfctl_tdf_with_attributes(
             # Create input file
             input_file = temp_path / "input.txt"
             input_content = "This is input data for testing attributes."
-            with open(input_file, "w") as f:
+            with input_file.open("w") as f:
                 f.write(input_content)
 
             # Define output file
@@ -143,7 +143,7 @@ def test_read_otdfctl_tdf_with_attributes(
             assert otdfctl_output.exists(), "otdfctl did not create TDF file"
 
             # Test that TDFReader can read the file with attributes
-            with open(otdfctl_output, "rb") as f:
+            with otdfctl_output.open("rb") as f:
                 tdf_data = f.read()
 
             reader = TDFReader(io.BytesIO(tdf_data))
@@ -209,10 +209,10 @@ def test_read_multiple_otdfctl_files(
                 # Create input file
                 input_file = temp_path / f"{test_case['name']}.txt"
                 if isinstance(test_case["content"], bytes):
-                    with open(input_file, "wb") as f:
+                    with input_file.open("wb") as f:
                         f.write(test_case["content"])
                 else:
-                    with open(input_file, "w") as f:
+                    with input_file.open("w") as f:
                         f.write(test_case["content"])
 
                 # Define output file
@@ -235,7 +235,7 @@ def test_read_multiple_otdfctl_files(
                 )
 
                 # Test TDFReader on this file
-                with open(output_file, "rb") as f:
+                with output_file.open("rb") as f:
                     tdf_data = f.read()
 
                 reader = TDFReader(io.BytesIO(tdf_data))
diff --git a/tests/integration/test_cli_integration.py b/tests/integration/test_cli_integration.py
index 9201e8e..f830e69 100644
--- a/tests/integration/test_cli_integration.py
+++ b/tests/integration/test_cli_integration.py
@@ -35,7 +35,7 @@ def test_cli_decrypt_otdfctl_tdf(
         # Create input file
         input_file = temp_path / "input.txt"
         input_content = "Hello, World! This is a test for decryption."
-        with open(input_file, "w") as f:
+        with input_file.open("w") as f:
             f.write(input_content)
 
         # Define TDF file created by otdfctl
@@ -99,7 +99,7 @@ def test_otdfctl_decrypt_comparison(
         # Create input file
         input_file = temp_path / "input.txt"
         input_content = "Hello, World! This is a test for otdfctl decrypt comparison."
-        with open(input_file, "w") as f:
+        with input_file.open("w") as f:
             f.write(input_content)
 
         # Define TDF file created by otdfctl
@@ -183,7 +183,7 @@ def test_otdfctl_encrypt_decrypt_roundtrip(collect_server_logs, temp_credentials
         input_content = (
             "Hello, World! This is a test for otdfctl roundtrip encryption/decryption."
         )
-        with open(input_file, "w") as f:
+        with input_file.open("w") as f:
             f.write(input_content)
 
         # Define TDF file and decrypted output
@@ -258,7 +258,7 @@ def test_cli_encrypt_integration(
         # Create input file
         input_file = temp_path / "input.txt"
         input_content = "Hello, World"
-        with open(input_file, "w") as f:
+        with input_file.open("w") as f:
             f.write(input_content)
 
         # Define output files
diff --git a/tests/integration/test_cli_tdf_validation.py b/tests/integration/test_cli_tdf_validation.py
index ff6dfd5..c484cca 100644
--- a/tests/integration/test_cli_tdf_validation.py
+++ b/tests/integration/test_cli_tdf_validation.py
@@ -28,7 +28,7 @@
 def _create_test_input_file(temp_path: Path, content: str) -> Path:
     """Create a test input file with the given content."""
     input_file = temp_path / "input.txt"
-    with open(input_file, "w") as f:
+    with input_file.open("w") as f:
         f.write(content)
     return input_file
 
@@ -471,7 +471,7 @@ def test_different_content_types(
             # Create input file
             input_file = temp_path / filename
             # Use binary mode for consistent handling of all content types
-            with open(input_file, "w", encoding="utf-8") as f:
+            with input_file.open("w", encoding="utf-8") as f:
                 f.write(content)
 
             # Test with Python CLI
@@ -528,7 +528,7 @@ def test_different_content_types_empty(
             # Create input file
             input_file = temp_path / filename
             # Use binary mode for consistent handling of all content types
-            with open(input_file, "w", encoding="utf-8") as f:
+            with input_file.open("w", encoding="utf-8") as f:
                 f.write(content)
 
             # Test with Python CLI
diff --git a/tests/integration/test_pe_interaction.py b/tests/integration/test_pe_interaction.py
index e9828a3..3758811 100644
--- a/tests/integration/test_pe_interaction.py
+++ b/tests/integration/test_pe_interaction.py
@@ -22,7 +22,7 @@
 
 def decrypt(input_path: Path, output_path: Path, sdk: SDK):
     # Determine output
-    with open(input_path, "rb") as infile, open(output_path, "wb") as outfile:
+    with input_path.open("rb") as infile, output_path.open("wb") as outfile:
         try:
             logger.debug("Decrypting TDF")
             tdf_reader = sdk.load_tdf(infile.read())
@@ -57,7 +57,7 @@ def test_single_attribute_encryption_decryption():
         input_path = Path(INPUT_FILE)
 
         output_path = input_path.with_suffix(input_path.suffix + ".tdf")
-        with open(input_path, "rb") as infile, open(output_path, "wb") as outfile:
+        with input_path.open("rb") as infile, output_path.open("wb") as outfile:
             sdk.create_tdf(infile.read(), config, output_stream=outfile)
 
         TDF_FILE = output_path
@@ -69,7 +69,7 @@ def test_single_attribute_encryption_decryption():
         DECRYPTED_FILE_SDK.touch()  # Ensure the file exists
 
         decrypt(TDF_FILE, DECRYPTED_FILE_SDK, sdk)
-        with open(INPUT_FILE, "rb") as f1, open(DECRYPTED_FILE_SDK, "rb") as f2:
+        with INPUT_FILE.open("rb") as f1, DECRYPTED_FILE_SDK.open("rb") as f2:
             assert f1.read() == f2.read(), "SDK decrypted output does not match input"
 
         # # Decrypt with otdfctl
diff --git a/tests/support_common.py b/tests/support_common.py
index c3bcf5c..153cf9e 100644
--- a/tests/support_common.py
+++ b/tests/support_common.py
@@ -55,7 +55,7 @@ def validate_tdf3_file(tdf_path: Path, tool_name: str) -> None:
     assert zipfile.is_zipfile(tdf_path), f"{tool_name} output is not a valid ZIP file"
 
     # Verify TDF file has correct ZIP signature
-    with open(tdf_path, "rb") as f:
+    with tdf_path.open("rb") as f:
         tdf_header = f.read(4)
     assert tdf_header == b"PK\x03\x04", f"{tool_name} output is not a valid ZIP file"
     assert tdf_path.suffix == ".tdf", f"File should have .tdf extension: {tdf_path}"
@@ -68,7 +68,7 @@ def validate_plaintext_file_created(
     assert path.exists(), f"{scenario=} did not create decrypted file"
     assert path.stat().st_size > 0, f"{scenario=} created empty decrypted file"
     # Verify scenario produces the expected decrypted content
-    with open(path) as f:
+    with path.open() as f:
         decrypted_content = f.read()
 
     assert decrypted_content == expected_content, (
diff --git a/tests/test_cli.py b/tests/test_cli.py
index abd8cc3..b1d8b4d 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -2,7 +2,6 @@
 Test CLI functionality
 """
 
-import os
 import subprocess
 import sys
 import tempfile
@@ -37,7 +36,7 @@ def test_cli_version(project_root):
     assert result.returncode == 0
     assert "OpenTDF Python SDK" in result.stdout
 
-    with open(Path(__file__).parent.parent / "pyproject.toml", "rb") as f:
+    with (Path(__file__).parent.parent / "pyproject.toml").open("rb") as f:
         # Use tomli for Python < 3.11, tomllib for 3.11+
         if sys.version_info < (3, 11):
             import tomli
@@ -110,7 +109,7 @@ def test_cli_encrypt_missing_auth(project_root):
         assert "Authentication required" in result.stderr
         assert "--with-client-creds-file" in result.stderr
     finally:
-        os.unlink(temp_file)
+        Path(temp_file).unlink()
 
 
 def test_cli_encrypt_missing_creds_file(project_root):
@@ -137,7 +136,7 @@ def test_cli_encrypt_missing_creds_file(project_root):
         assert result.returncode == 1
         assert "Credentials file does not exist" in result.stderr
     finally:
-        os.unlink(temp_file)
+        Path(temp_file).unlink()
 
 
 def test_cli_encrypt_invalid_creds_file(project_root):
@@ -168,8 +167,8 @@ def test_cli_encrypt_invalid_creds_file(project_root):
         assert result.returncode == 1
         assert "must contain 'clientId' and 'clientSecret' fields" in result.stderr
     finally:
-        os.unlink(temp_file)
-        os.unlink(creds_file)
+        Path(temp_file).unlink()
+        Path(creds_file).unlink()
 
 
 def test_cli_decrypt_missing_file(project_root):
diff --git a/tests/test_crypto_utils.py b/tests/test_crypto_utils.py
index 2a802f5..c495208 100644
--- a/tests/test_crypto_utils.py
+++ b/tests/test_crypto_utils.py
@@ -27,7 +27,7 @@ def test_ec_keypair(self):
         self.assertIn("BEGIN PRIVATE KEY", priv_pem)
 
     def test_rsa_key_type_check(self):
-        priv, pub = CryptoUtils.generate_rsa_keypair()
+        _priv, _pub = CryptoUtils.generate_rsa_keypair()
         with self.assertRaises(ValueError):
             CryptoUtils.get_rsa_public_key_pem("notakey")
         with self.assertRaises(ValueError):
diff --git a/tests/test_manifest_format.py b/tests/test_manifest_format.py
index 674aa26..7be368d 100644
--- a/tests/test_manifest_format.py
+++ b/tests/test_manifest_format.py
@@ -24,7 +24,7 @@ def test_manifest_field_format():
     test_data = b"Hello World"
     tdf_instance = TDF()
     config.policy_object = {"uuid": "test-uuid", "body": {"dissem": ["test"]}}
-    manifest, size, output_stream = tdf_instance.create_tdf(
+    manifest, _size, _output_stream = tdf_instance.create_tdf(
         payload=test_data, config=config
     )
 
@@ -82,7 +82,7 @@ def test_manifest_roundtrip_serialization():
     test_data = b"Hello World"
     tdf_instance = TDF()
     config.policy_object = {"uuid": "test-uuid", "body": {"dissem": ["test"]}}
-    manifest, size, output_stream = tdf_instance.create_tdf(
+    manifest, _size, _output_stream = tdf_instance.create_tdf(
         payload=test_data, config=config
     )
 
diff --git a/tests/test_sdk_builder.py b/tests/test_sdk_builder.py
index 0e9f835..0fae7ae 100644
--- a/tests/test_sdk_builder.py
+++ b/tests/test_sdk_builder.py
@@ -2,8 +2,8 @@
 Tests for the SDKBuilder class.
 """
 
-import os
 import tempfile
+from pathlib import Path
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -103,10 +103,11 @@ def test_ssl_context_from_directory():
     # Create temporary directory with cert files
     with tempfile.TemporaryDirectory() as tmpdirname:
         # Create dummy cert files
+        tmpdir_path = Path(tmpdirname)
         with (
-            open(os.path.join(tmpdirname, "cert1.pem"), "w") as f1,
-            open(os.path.join(tmpdirname, "cert2.crt"), "w") as f2,
-            open(os.path.join(tmpdirname, "not_a_cert.txt"), "w") as f3,
+            (tmpdir_path / "cert1.pem").open("w") as f1,
+            (tmpdir_path / "cert2.crt").open("w") as f2,
+            (tmpdir_path / "not_a_cert.txt").open("w") as f3,
         ):
             f1.write("dummy cert")
             f2.write("dummy cert")
diff --git a/tests/test_sdk_tdf_integration.py b/tests/test_sdk_tdf_integration.py
index eaedafe..85b2a85 100644
--- a/tests/test_sdk_tdf_integration.py
+++ b/tests/test_sdk_tdf_integration.py
@@ -14,7 +14,7 @@ def test_sdk_create_tdf_with_builder():
     from otdf_python.kas_info import KASInfo
 
     # Generate key pair for testing
-    kas_private_key, kas_public_key = generate_rsa_keypair()
+    _kas_private_key, kas_public_key = generate_rsa_keypair()
 
     # Create SDK with builder
     sdk = SDKBuilder().set_platform_endpoint("https://example.kas.com").build()
@@ -37,7 +37,7 @@ def test_sdk_create_tdf_with_builder():
     output = io.BytesIO()
 
     # This should not raise an AttributeError or ValueError
-    manifest, size, out_stream = sdk.create_tdf(payload, config, output_stream=output)
+    _manifest, size, out_stream = sdk.create_tdf(payload, config, output_stream=output)
 
     # Basic validations
     assert size > 0
@@ -50,7 +50,7 @@ def test_validate_otdf_python_script():
     from otdf_python.kas_info import KASInfo
 
     # Generate key pair for testing
-    kas_private_key, kas_public_key = generate_rsa_keypair()
+    _kas_private_key, kas_public_key = generate_rsa_keypair()
 
     # Create SDK with builder
     sdk = SDKBuilder().set_platform_endpoint("https://default.kas.example.com").build()
@@ -74,7 +74,7 @@ def test_validate_otdf_python_script():
     output = io.BytesIO()
 
     # This should not raise an AttributeError or ValueError
-    manifest, size, out_stream = sdk.create_tdf(payload, config, output_stream=output)
+    _manifest, size, out_stream = sdk.create_tdf(payload, config, output_stream=output)
 
     # Basic validations
     assert size > 0
diff --git a/tests/test_tdf.py b/tests/test_tdf.py
index 699ba32..1dcc8c9 100644
--- a/tests/test_tdf.py
+++ b/tests/test_tdf.py
@@ -49,7 +49,7 @@ def test_tdf_multi_kas_roundtrip():
     kas2 = KASInfo(url="https://kas2.example.com", public_key=pub2, kid="kas2")
 
     config = TDFConfig(kas_info_list=[kas1, kas2])
-    manifest, size, out = tdf.create_tdf(payload, config)
+    _manifest, _size, out = tdf.create_tdf(payload, config)
     data = out.getvalue() if hasattr(out, "getvalue") else out.read()
     # Should be able to decrypt with either KAS private key
     for priv in (priv1, priv2):
diff --git a/tests/test_tdf_reader.py b/tests/test_tdf_reader.py
index 5e7c634..663ccea 100644
--- a/tests/test_tdf_reader.py
+++ b/tests/test_tdf_reader.py
@@ -78,7 +78,7 @@ def test_init_no_payload(self, mock_zip_reader):
 
     def test_manifest(self, mock_zip_reader):
         """Test getting the manifest content."""
-        mock_reader, manifest_data, _ = mock_zip_reader
+        mock_reader, _manifest_data, _ = mock_zip_reader
         manifest_content = json.dumps({"test": "manifest"})
 
         reader = TDFReader(io.BytesIO(b"fake tdf data"))
@@ -108,7 +108,7 @@ def test_read_payload_bytes(self, mock_zip_reader):
     @patch("otdf_python.tdf_reader.Manifest")
     def test_read_policy_object(self, mock_manifest, mock_zip_reader):
         """Test reading the policy object from the manifest."""
-        mock_reader, manifest_data, _ = mock_zip_reader
+        mock_reader, _manifest_data, _ = mock_zip_reader
 
         # Create a realistic manifest with a base64 encoded policy
         import base64
diff --git a/tests/test_url_normalization.py b/tests/test_url_normalization.py
index 6c6eab9..a5757fc 100644
--- a/tests/test_url_normalization.py
+++ b/tests/test_url_normalization.py
@@ -6,12 +6,6 @@
 the use_plaintext setting when converting URLs.
 """
 
-# Allow importing from src directory
-import os
-import sys
-
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
-
 from src.otdf_python.kas_client import KASClient
 
 
diff --git a/tests/test_validate_otdf_python.py b/tests/test_validate_otdf_python.py
index 369b40f..1ac0818 100644
--- a/tests/test_validate_otdf_python.py
+++ b/tests/test_validate_otdf_python.py
@@ -40,7 +40,7 @@ def encrypt_file(input_path: Path) -> Path:
     sdk, tdf_config = _get_sdk_and_tdf_config()
 
     output_path = input_path.with_suffix(input_path.suffix + ".tdf")
-    with open(input_path, "rb") as infile, open(output_path, "wb") as outfile:
+    with input_path.open("rb") as infile, output_path.open("wb") as outfile:
         sdk.create_tdf(infile.read(), tdf_config, output_stream=outfile)
     return output_path
 
@@ -50,7 +50,7 @@ def decrypt_file(encrypted_path: Path) -> Path:
     sdk = get_sdk()
 
     output_path = encrypted_path.with_suffix(".decrypted")
-    with open(encrypted_path, "rb") as infile, open(output_path, "wb") as outfile:
+    with encrypted_path.open("rb") as infile, output_path.open("wb") as outfile:
         # Use KAS client for key unwrapping
         reader = sdk.load_tdf(infile.read())
         # TDFReader is a dataclass with payload attribute
@@ -140,9 +140,9 @@ def verify_encrypt_decrypt_file() -> None:
                 assert decrypted_path.exists()
 
                 # Validate content
-                with open(input_file, "rb") as f:
+                with input_file.open("rb") as f:
                     original = f.read()
-                with open(decrypted_path, "rb") as f:
+                with decrypted_path.open("rb") as f:
                     decrypted = f.read()
                 assert original == decrypted, "Decrypted content doesn't match original"
 
diff --git a/tests/test_zip_reader.py b/tests/test_zip_reader.py
index 11af01c..cde645e 100644
--- a/tests/test_zip_reader.py
+++ b/tests/test_zip_reader.py
@@ -1,6 +1,7 @@
 import io
 import random
 import unittest
+from pathlib import Path
 
 from otdf_python.zip_reader import ZipReader
 from otdf_python.zip_writer import ZipWriter
@@ -33,7 +34,7 @@ def test_extract(self):
         reader = ZipReader(io.BytesIO(data))
         with tempfile.TemporaryDirectory() as tmpdir:
             out_path = reader.extract("baz.txt", tmpdir)
-            with open(out_path, "rb") as f:
+            with Path(out_path).open("rb") as f:
                 self.assertEqual(f.read(), b"baz")
         reader.close()
 
diff --git a/uv.lock b/uv.lock
index dce9354..9367acb 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1063,28 +1063,28 @@ wheels = [
 
 [[package]]
 name = "ruff"
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+version = "0.13.1"
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