diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0a89c8bb..f1709971 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -117,16 +117,18 @@ jobs:
         uses: "actions/checkout@v2"
       - name: "Setup environment"
         uses: "networktocode/gh-action-setup-poetry-environment@v2"
-      - name: "Cache Docker images"
-        uses: "actions/cache@v2"
-        id: "cached-docker-images"
-        with:
-          path: "/tmp/docker"
-          key: "${{ runner.os }}-docker-${{ matrix.python-version }}-${{ hashFiles('./Dockerfile') }}"
-      - name: "Load docker image"
-        run: "docker load < /tmp/docker/netutils-py${{ matrix.python-version }}.tar"
-      - name: "Show docker images"
-        run: "docker image ls"
+      # - name: "Cache Docker images"
+      #   uses: "actions/cache@v2"
+      #   id: "cached-docker-images"
+      #   with:
+      #     path: "/tmp/docker"
+      #     key: "${{ runner.os }}-docker-${{ matrix.python-version }}-${{ hashFiles('./Dockerfile') }}"
+      # - name: "Load docker image"
+      #   run: "docker load < /tmp/docker/netutils-py${{ matrix.python-version }}.tar"
+      # - name: "Show docker images"
+      #   run: "docker image ls"
+      - name: "Build Container"
+        run: "poetry run invoke build"
       - name: "Linting: Pylint"
         run: "poetry run invoke pylint"
     needs:
@@ -144,14 +146,18 @@ jobs:
         uses: "actions/checkout@v2"
       - name: "Setup environment"
         uses: "networktocode/gh-action-setup-poetry-environment@v2"
-      - name: "Cache Docker images"
-        uses: "actions/cache@v2"
-        id: "cached-docker-images"
-        with:
-          path: "/tmp/docker"
-          key: "${{ runner.os }}-docker-${{ matrix.python-version }}-${{ hashFiles('./Dockerfile') }}"
-      - name: "Load docker image"
-        run: "docker load < /tmp/docker/netutils-py${{ matrix.python-version }}.tar"
+      # - name: "Cache Docker images"
+      #   uses: "actions/cache@v2"
+      #   id: "cached-docker-images"
+      #   with:
+      #     path: "/tmp/docker"
+      #     key: "${{ runner.os }}-docker-${{ matrix.python-version }}-${{ hashFiles('./Dockerfile') }}"
+      # - name: "Load docker image"
+      #   run: "docker load < /tmp/docker/netutils-py${{ matrix.python-version }}.tar"
+      - name: "Build Container"
+        run: "poetry run invoke build"
+      - name: "Linting: Pylint"
+        run: "poetry run invoke pylint"
       - name: "Run Tests"
         run: "poetry run invoke pytest"
     needs:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 551293b0..419327bc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Changelog
 
+## v0.2.4 - 2021-11
+
+### Added
+
+- #33 Add interface range compress function
+- #53 Add get peer address function
+- #59 Add bandwidth converting function
+- #65 Added Docker caching
+- #68 Add Fortinet Fortios Parser support
+
+### Changed
+
+- #64 CI implementation on GitHub actions
+
+### Fixed
+
+- #52 Update pyproject.toml build-server 
+- #55 update version in toml and init files
+- #63 Fix lack of zero padding on ip to binary conversion
+- #70 Fix lack of zero padding on ip to hex conversion
+- #68 Update Black pinning
+
 ## v0.2.3 - 2021-09
 
 ### Added
diff --git a/docs/source/sphinxext/exec.py b/docs/source/sphinxext/exec.py
index f6929b15..6cdf5b26 100644
--- a/docs/source/sphinxext/exec.py
+++ b/docs/source/sphinxext/exec.py
@@ -33,7 +33,7 @@ def run(self):
             return [
                 nodes.error(
                     None,
-                    nodes.paragraph(text="Unable to execute python code at %s:%d:" % (basename(source), self.lineno)),
+                    nodes.paragraph(text=f"Unable to execute python code at {basename(source)}:{self.lineno}:"),
                     nodes.paragraph(text=str(sys.exc_info()[1])),
                 )
             ]
diff --git a/netutils/__init__.py b/netutils/__init__.py
index 2c1b8acd..41c1aec3 100644
--- a/netutils/__init__.py
+++ b/netutils/__init__.py
@@ -1,3 +1,3 @@
 """Initialization file for library."""
 
-__version__ = "0.2.3"
+__version__ = "0.2.4"
diff --git a/netutils/config/compliance.py b/netutils/config/compliance.py
index 84bac72d..5a0257fe 100644
--- a/netutils/config/compliance.py
+++ b/netutils/config/compliance.py
@@ -99,7 +99,7 @@ def _is_feature_ordered_compliant(feature_intended_cfg, feature_actual_cfg):
 def _open_file_config(cfg_path):
     """Open config file from local disk."""
     try:
-        with open(cfg_path) as filehandler:
+        with open(cfg_path, encoding="utf-8") as filehandler:
             device_cfg = filehandler.read()
     except IOError:
         return False
@@ -168,7 +168,7 @@ def compliance(features, backup, intended, network_os, cfg_type="file"):
         backup_cfg = backup
         intended_cfg = intended
 
-    compliance_results = dict()
+    compliance_results = {}
 
     for feature in features:
         backup_str = section_config(feature, backup_cfg, network_os)
@@ -207,7 +207,7 @@ def config_section_not_parsed(features, device_cfg, network_os):
         {'remaining_cfg': '!\naccess-list 1 permit 10.10.10.10\naccess-list 1 permit 10.10.10.11', 'section_not_found': []}
     """
     remaining_cfg = device_cfg
-    section_not_found = list()
+    section_not_found = []
     for feature in features:
         feature_cfg = section_config(feature, device_cfg, network_os)
         if not feature_cfg:
@@ -357,7 +357,7 @@ def find_unordered_cfg_lines(intended_cfg, actual_cfg):
     """
     intended_lines = intended_cfg.splitlines()
     actual_lines = actual_cfg.splitlines()
-    unordered_lines = list()
+    unordered_lines = []
     if len(intended_lines) == len(actual_lines):
         # Process to find actual lines that are misordered
         unordered_lines = [(e1, e2) for e1, e2 in zip(intended_lines, actual_lines) if e1 != e2]
diff --git a/netutils/config/parser.py b/netutils/config/parser.py
index ef466b61..cfa7990f 100644
--- a/netutils/config/parser.py
+++ b/netutils/config/parser.py
@@ -172,7 +172,7 @@ def _remove_parents(self, line, current_spaces):
                 previous_parent = self._current_parents[-deindent_level]
                 previous_indent = self.get_leading_space_count(previous_parent)
         except IndexError:
-            raise IndexError("\nValidate the first line does not begin with a space" "\n{}\n".format(line))
+            raise IndexError(f"\nValidate the first line does not begin with a space\n{line}\n")
         parents = self._current_parents[:-deindent_level] or (self._current_parents[0],)
         return parents
 
diff --git a/netutils/constants.py b/netutils/constants.py
index f49cfec9..3089369f 100644
--- a/netutils/constants.py
+++ b/netutils/constants.py
@@ -4,8 +4,8 @@
 from netutils import __file__ as netutils_file
 
 # Load the PROTOCOLS json file.
-with open("/".join([dirname(netutils_file), "protocols.json"])) as f:
-    PROTOCOLS = json.loads(f.read())
+with open("/".join([dirname(netutils_file), "protocols.json"]), encoding="utf-8") as fh:
+    PROTOCOLS = json.loads(fh.read())
 
 # This variable provides mapping for known interface variants, to the associated long form.
 BASE_INTERFACES = {
diff --git a/netutils/interface.py b/netutils/interface.py
index 9e2e33b2..d0579261 100644
--- a/netutils/interface.py
+++ b/netutils/interface.py
@@ -2,7 +2,7 @@
 import itertools
 import re
 import typing as t
-from abc import ABC, abstractmethod, abstractproperty
+from abc import ABC, abstractmethod
 from functools import total_ordering
 from operator import itemgetter
 from .constants import BASE_INTERFACES, REVERSE_MAPPING
@@ -253,7 +253,8 @@ def __lt__(self, other) -> bool:  # noqa: D105
     def __eq__(self, other) -> bool:  # noqa: D105
         return self.weight == other.weight and self.val == other.val
 
-    @abstractproperty
+    @property
+    @abstractmethod
     def weight(self) -> int:
         """Weight property."""
         ...
diff --git a/netutils/ip.py b/netutils/ip.py
index 95de4ff6..b7ecaa5b 100644
--- a/netutils/ip.py
+++ b/netutils/ip.py
@@ -15,10 +15,11 @@ def ip_to_hex(ip):
     Example:
         >>> from netutils.ip import ip_to_hex
         >>> ip_to_hex("10.100.100.100")
-        'a646464'
+        '0a646464'
         >>>
     """
-    return str(hex(int(ipaddress.ip_address(ip))))[2:]
+    ip_obj = ipaddress.ip_address(ip)
+    return str(hex(int(ip_obj)))[2:].zfill(int(ip_obj.max_prefixlen / 4))
 
 
 def ip_addition(ip, val):
@@ -243,7 +244,7 @@ def get_first_usable(ip_network):
         >>>
     """
     net = ipaddress.ip_network(ip_network)
-    if net.prefixlen == 31 or net.prefixlen == 127:
+    if net.prefixlen in [31, 127]:
         return str(net[0])
     return str(net[1])
 
@@ -302,7 +303,7 @@ def get_usable_range(ip_network):
         >>>
     """
     net = ipaddress.ip_network(ip_network)
-    if net.prefixlen == 31 or net.prefixlen == 127:
+    if net.prefixlen in [31, 127]:
         lower_bound = str(net[0])
         upper_bound = str(net[1])
     else:
diff --git a/netutils/password.py b/netutils/password.py
index 5ee58285..814eaf6c 100644
--- a/netutils/password.py
+++ b/netutils/password.py
@@ -185,7 +185,7 @@ def encrypt_type5(unencrypted_password, salt=None, salt_len=4):
     if not salt:
         salt = "".join(secrets.choice(ALPHABET) for i in range(salt_len))
     elif not set(salt) <= set(ALPHABET):
-        raise ValueError("type5_pw salt used inproper characters, must be one of %s" % (ALPHABET))
+        raise ValueError(f"type5_pw salt used inproper characters, must be one of {ALPHABET}")
     return crypt.crypt(unencrypted_password, f"$1${salt}$")
 
 
@@ -207,9 +207,10 @@ def encrypt_type7(unencrypted_password, salt=None):
     """
     if not salt:
         salt = random.randrange(0, 15)  # nosec
-    encrypted_password = "%02x" % salt
+    encrypted_password = "%02x" % salt  # pylint: disable=consider-using-f-string
     for i, _ in enumerate(unencrypted_password):
-        encrypted_password += "%02x" % (ord(unencrypted_password[i]) ^ XLAT[salt])
+        hex_password = "%02x" % (ord(unencrypted_password[i]) ^ XLAT[salt])  # pylint: disable=consider-using-f-string
+        encrypted_password += hex_password
         salt += 1
         if salt == 51:
             salt = 0
@@ -233,5 +234,5 @@ def get_hash_salt(encrypted_password):
     """
     split_password = encrypted_password.split("$")
     if len(split_password) != 4:
-        raise ValueError("Could not parse salt out password correctly from {0}".format(encrypted_password))
+        raise ValueError(f"Could not parse salt out password correctly from {encrypted_password}")
     return split_password[2]
diff --git a/netutils/vlan.py b/netutils/vlan.py
index fec89a27..a937ca6a 100644
--- a/netutils/vlan.py
+++ b/netutils/vlan.py
@@ -31,12 +31,12 @@ def vlanlist_to_config(vlan_list, first_line_len=48, other_line_len=44):
         raise ValueError("Valid VLAN range is 1-4094")
 
     # Group consecutive VLANs
-    vlan_groups = list()
+    vlan_groups = []
     for _, vlan in groupby(enumerate(clean_vlan_list), lambda vlan: vlan[0] - vlan[1]):
         vlan_groups.append(list(map(itemgetter(1), vlan)))
 
     # Create VLAN portion of config
-    vlan_strings = list()
+    vlan_strings = []
     for group in vlan_groups:
         if len(group) == 1:
             vlan_strings.append(f"{group[0]}")
diff --git a/pyproject.toml b/pyproject.toml
index f50f26f4..2acfb75d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "netutils"
-version = "0.2.3"
+version = "0.2.4"
 description = "Common helper functions useful in network automation."
 authors = ["Network to Code, LLC <opensource@networktocode.com>"]
 license = "Apache-2.0"
@@ -78,6 +78,7 @@ good-names="i,ip,j,k,ex,Run,_"
 disable = """,
     line-too-long,
     bad-continuation,
+    consider-iterating-dictionary,
     """
 
 [tool.pylint.miscellaneous]
diff --git a/tests/unit/conftest.py b/tests/unit/conftest.py
index d9a11011..059e4710 100644
--- a/tests/unit/conftest.py
+++ b/tests/unit/conftest.py
@@ -19,7 +19,7 @@ def _method(_file):
         Returns:
             dict: The data structure from the JSON file.
         """
-        with open(_file) as file:
+        with open(_file, encoding="utf-8") as file:
             data = json.load(file)
         return data
 
@@ -39,7 +39,7 @@ def _method(_file):
         Returns:
             str: The data structure from the text file.
         """
-        with open(_file) as file:
+        with open(_file, encoding="utf-8") as file:
             data = file.read()
         return data
 
diff --git a/tests/unit/test_docs.py b/tests/unit/test_docs.py
index e2f90808..3d5a7ffa 100644
--- a/tests/unit/test_docs.py
+++ b/tests/unit/test_docs.py
@@ -54,7 +54,7 @@
 ]
 
 
-with open("README.md", "r") as file:
+with open("README.md", "r", encoding="utf-8") as file:
     README_LIST = file.readlines()
 README_LIST.insert(0, "")
 
diff --git a/tests/unit/test_ip.py b/tests/unit/test_ip.py
index a1f69080..c6b8b49b 100644
--- a/tests/unit/test_ip.py
+++ b/tests/unit/test_ip.py
@@ -6,7 +6,7 @@
 IP_TO_HEX = [
     {
         "sent": {"ip": "10.1.1.1"},
-        "received": "a010101",
+        "received": "0a010101",
     },
     {
         "sent": {"ip": "2001:db8:3333:4444:5555:6666:7777:8888"},