diff --git a/onnxscript/_thirdparty/asciichartpy.py b/onnxscript/_thirdparty/asciichartpy.py
index 68def718a9..88c46202ca 100644
--- a/onnxscript/_thirdparty/asciichartpy.py
+++ b/onnxscript/_thirdparty/asciichartpy.py
@@ -198,8 +198,8 @@ def plot(series, *, bin_edges=None, cfg=None):
     height = cfg.get("height", interval)
     ratio = height / interval if interval > 0 else 1
 
-    min2 = int(floor(minimum * ratio))
-    max2 = int(ceil(maximum * ratio))
+    min2 = floor(minimum * ratio)
+    max2 = ceil(maximum * ratio)
 
     def clamp(n):
         return min(max(n, minimum), maximum)
diff --git a/onnxscript/converter.py b/onnxscript/converter.py
index 2f9b690c96..a565cacfdb 100644
--- a/onnxscript/converter.py
+++ b/onnxscript/converter.py
@@ -1239,14 +1239,14 @@ def _translate_loop_stmt(self, loop_stmt: Union[ast.For, ast.While]) -> None:
                 if i != len(loop_stmt.body) - 1:
                     self.fail(s, "Instruction break must be the last one of the loop.")
 
-                _current_scope = self._current_scope()
-                if s.test.id not in _current_scope:
+                current_scope = self._current_scope()
+                if s.test.id not in current_scope:
                     self.fail(
                         loop_stmt,
                         f"Unable to find condition variable {s.test.id!r} in known "
-                        f"variables {list(_current_scope)!r}.",
+                        f"variables {list(current_scope)!r}.",
                     )
-                condition_name = _current_scope[s.test.id].value
+                condition_name = current_scope[s.test.id].value
                 operator_name = "Not"
                 continue
             self._translate_stmt(s)
@@ -1255,14 +1255,14 @@ def _translate_loop_stmt(self, loop_stmt: Union[ast.For, ast.While]) -> None:
 
         if cond_while is not None:
             # Loop while
-            _current_scope = self._current_scope()
-            if cond_while not in _current_scope:
+            current_scope = self._current_scope()
+            if cond_while not in current_scope:
                 self.fail(
                     loop_stmt,
                     f"Unable to find condition variable {cond_while!r} in known "
-                    f"variables {list(_current_scope)!r}.",
+                    f"variables {list(current_scope)!r}.",
                 )
-            o_cond_var = _current_scope[cond_while].value
+            o_cond_var = current_scope[cond_while].value
 
         self.emit(
             [o_cond_out],
diff --git a/onnxscript/evaluator.py b/onnxscript/evaluator.py
index 6020f9e785..ba235a5e41 100644
--- a/onnxscript/evaluator.py
+++ b/onnxscript/evaluator.py
@@ -290,16 +290,16 @@ def eval_function(
         has_array = False
         for arg, param_schema in tagged_args:
             if param_schema.is_input:
-                adapted_arg, _has_array = _adapt_to_eager_mode(arg)
-                has_array = has_array or _has_array
+                adapted_arg, has_array_ = _adapt_to_eager_mode(arg)
+                has_array = has_array or has_array_
                 adapted_args.append(adapted_arg)
             else:
                 adapted_args.append(arg)
 
         for key, (arg, param_schema) in tagged_kwargs.items():
             if param_schema.is_input:
-                adapted_arg, _has_array = _adapt_to_eager_mode(arg)
-                has_array = has_array or _has_array
+                adapted_arg, has_array_ = _adapt_to_eager_mode(arg)
+                has_array = has_array or has_array_
                 adapted_kwargs[key] = adapted_arg
             else:
                 adapted_kwargs[key] = arg
diff --git a/onnxscript/function_libs/tools/torch_lib/deduce_type_constraints.py b/onnxscript/function_libs/tools/torch_lib/deduce_type_constraints.py
index 20b3436973..c5b87898c9 100644
--- a/onnxscript/function_libs/tools/torch_lib/deduce_type_constraints.py
+++ b/onnxscript/function_libs/tools/torch_lib/deduce_type_constraints.py
@@ -210,15 +210,15 @@ def type_constraints(self, signature_only: bool = True) -> OnnxFunctionTypeConst
         )
 
         # Rename type constraints to T0, T1, T2, ...
-        _seen_type_constraints: Set[TypeConstraint] = set()
+        seen_type_constraints: Set[TypeConstraint] = set()
         for type_constraint in (
             *input_type_constraints.values(),
             *output_type_constraints.values(),
             *intermediate_type_constraints.values(),
         ):
-            if type_constraint is not None and type_constraint not in _seen_type_constraints:
-                type_constraint.name = f"T{len(_seen_type_constraints)}"
-                _seen_type_constraints.add(type_constraint)
+            if type_constraint is not None and type_constraint not in seen_type_constraints:
+                type_constraint.name = f"T{len(seen_type_constraints)}"
+                seen_type_constraints.add(type_constraint)
 
         return OnnxFunctionTypeConstraints(
             input_type_constraints, output_type_constraints, intermediate_type_constraints
diff --git a/onnxscript/function_libs/tools/torch_lib/generate_aten_signatures.py b/onnxscript/function_libs/tools/torch_lib/generate_aten_signatures.py
index 44c3980668..eb2d8015a4 100644
--- a/onnxscript/function_libs/tools/torch_lib/generate_aten_signatures.py
+++ b/onnxscript/function_libs/tools/torch_lib/generate_aten_signatures.py
@@ -283,7 +283,7 @@ def main(args: argparse.Namespace) -> None:
             functions[module_name] = {}
         op_name = get_op_name(func)
         if op_name in functions[module_name]:
-            logging.warning(
+            logging.warning(  # noqa: LOG015
                 "Duplicated function: %s, overload: %s", op_name, func.func.name.overload_name
             )
             continue
diff --git a/onnxscript/function_libs/tools/torch_lib/generate_prims_signatures.py b/onnxscript/function_libs/tools/torch_lib/generate_prims_signatures.py
index e96d24ed4a..ebbdd43bd8 100644
--- a/onnxscript/function_libs/tools/torch_lib/generate_prims_signatures.py
+++ b/onnxscript/function_libs/tools/torch_lib/generate_prims_signatures.py
@@ -258,7 +258,7 @@ def _get_func_schema_in_namespace(namespaces: List[_OpNamespace]) -> Dict[str, F
             # to "resize(Tensor a, SymInt[] shape) -> Tensor"
             if "!" in op_overload_packet.schema:
                 op_overload_packet.schema = re.sub(  # type: ignore[attr-defined]
-                    "[(][A-Za-z]![)]", "", op_overload_packet.schema
+                    r"[(][A-Za-z]![)]", "", op_overload_packet.schema
                 )
 
             # FIXME: remove below code if the issue below is fixed.
@@ -283,7 +283,7 @@ def main(args: argparse.Namespace) -> None:
         if module_name not in functions:
             functions[module_name] = {}
         if op_name in functions[module_name]:
-            logging.warning(
+            logging.warning(  # noqa: LOG015
                 "Duplicated function: %s, overload: %s",
                 op_name,
                 func_schema.name.overload_name,
diff --git a/onnxscript/ir/serde.py b/onnxscript/ir/serde.py
index 2d3a9849ea..079963df74 100644
--- a/onnxscript/ir/serde.py
+++ b/onnxscript/ir/serde.py
@@ -1071,7 +1071,7 @@ def format_name(value_name: str) -> str:
 
     for input in function.inputs:
         if not input.name:
-            logging.warning(
+            logger.warning(
                 "Function '%s': Value name not set for function input: %s",
                 function_qualified_name,
                 input,
@@ -1084,7 +1084,7 @@ def format_name(value_name: str) -> str:
     for node in function:
         for node_output in node.outputs:
             if not node_output.name:
-                logging.warning(
+                logger.warning(
                     "Function '%s': Value name not set for node output: %s",
                     function_qualified_name,
                     node_output,
diff --git a/onnxscript/rewriter/onnxruntime/xformers/_smollm_1layer.py b/onnxscript/rewriter/onnxruntime/xformers/_smollm_1layer.py
index c5bf35046e..730d3b614a 100644
--- a/onnxscript/rewriter/onnxruntime/xformers/_smollm_1layer.py
+++ b/onnxscript/rewriter/onnxruntime/xformers/_smollm_1layer.py
@@ -71,7 +71,7 @@ def main_graph(
         val_191 = opset18.Transpose(slice_scatter, perm=[1, 0, 2, 3])
         slice_scatter_1 = opset18.Transpose(val_191, perm=[1, 0, 2, 3])
         unsqueeze_6 = opset18.Unsqueeze(input2, 1)
-        _to_copy_1 = opset18.Cast(unsqueeze_6, to=1)
+        to_copy_1 = opset18.Cast(unsqueeze_6, to=1)
         view_1 = opset18.Constant(
             value=make_tensor(
                 "value",
@@ -113,7 +113,7 @@ def main_graph(
                 ],
             )
         )
-        view_2 = opset18.Reshape(_to_copy_1, [1, 1, 10], allowzero=0)
+        view_2 = opset18.Reshape(to_copy_1, [1, 1, 10], allowzero=0)
         bmm = view_1 @ view_2
         view_3 = opset18.Reshape(bmm, [1, 32, 10], allowzero=0)
         transpose = opset18.Transpose(view_3, perm=[0, 2, 1])
@@ -199,8 +199,8 @@ def main_graph(
         mul_13 = model_norm_weight * mul_12
         t_7 = opset18.Transpose(lm_head_weight, perm=[1, 0])
         view_23 = mul_13 @ t_7
-        _to_copy_12 = opset18.Identity(view_23)
-        return _to_copy_12, add_3, transpose_3
+        to_copy_12 = opset18.Identity(view_23)
+        return to_copy_12, add_3, transpose_3
 
     model = main_graph.to_model_proto()
     return model
diff --git a/onnxscript/rewriter/pattern.py b/onnxscript/rewriter/pattern.py
index b9d5d002a7..f2faf77c3f 100644
--- a/onnxscript/rewriter/pattern.py
+++ b/onnxscript/rewriter/pattern.py
@@ -411,7 +411,7 @@ def clone(self, node_map: dict[NodePattern, NodePattern]) -> ValuePattern:
     def name(self) -> str | None:
         return self._name
 
-    def producer(self) -> None | NodePattern:
+    def producer(self) -> NodePattern | None:
         return None
 
     def uses(self) -> Sequence[tuple[NodePattern, int]]:
diff --git a/onnxscript/tools/benchmark/benchmark_helpers.py b/onnxscript/tools/benchmark/benchmark_helpers.py
index 08951b39ed..f9a46c8f5d 100644
--- a/onnxscript/tools/benchmark/benchmark_helpers.py
+++ b/onnxscript/tools/benchmark/benchmark_helpers.py
@@ -108,7 +108,7 @@ def _cmd_line(script_name: str, **kwargs: dict[str, Any]) -> list[str]:
 
 
 def _extract_metrics(text: str) -> dict[str, str]:
-    reg = re.compile(":(.*?),(.*.?);")
+    reg = re.compile(r":(.*?),(.*.?);")
     res = reg.findall(text)
     if len(res) == 0:
         return {}
diff --git a/onnxscript/tools/benchmark/benchmark_run.py b/onnxscript/tools/benchmark/benchmark_run.py
index abae04b4cd..f961b9b320 100644
--- a/onnxscript/tools/benchmark/benchmark_run.py
+++ b/onnxscript/tools/benchmark/benchmark_run.py
@@ -45,7 +45,7 @@ def _cmd_line(script_name: str, **kwargs: dict[str, str | int | float]) -> list[
 
 
 def _extract_metrics(text: str) -> dict[str, str]:
-    reg = re.compile(":(.*?),(.*.?);")
+    reg = re.compile(r":(.*?),(.*.?);")
     res = reg.findall(text)
     if len(res) == 0:
         return {}
diff --git a/pyproject.toml b/pyproject.toml
index a9fc662c35..e96c2ddc31 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -194,6 +194,7 @@ ignore = [
     "PYI041", # int | float is more clear
     "RUF022", # We don't need to sort __all__ for elements to be grouped
     "RUF031", # Parentheses for tuple in subscripts is more readable
+    "RUF052", # Variables with `_` prefix may not be dummy variables in all cases
     "SIM102", # Collapible if statements are not always more readable
     "SIM108", # We don't always encourage ternary operators
     "SIM114", # Don't always combine if branches for debugability
diff --git a/requirements/lintrunner/requirements.txt b/requirements/lintrunner/requirements.txt
index c912ac2118..e6adda625e 100644
--- a/requirements/lintrunner/requirements.txt
+++ b/requirements/lintrunner/requirements.txt
@@ -1,7 +1,7 @@
 # This file is auto updated by dependabot
 lintrunner-adapters>=0.8.0
 # RUFF, RUFF-FIX
-ruff==0.7.3
+ruff==0.8.4
 # MYPY
 mypy==1.10.1
 types-PyYAML==6.0.12.20240808
diff --git a/tests/function_libs/torch_lib/ops_test_data.py b/tests/function_libs/torch_lib/ops_test_data.py
index 55e78593a8..73060623c8 100644
--- a/tests/function_libs/torch_lib/ops_test_data.py
+++ b/tests/function_libs/torch_lib/ops_test_data.py
@@ -254,10 +254,8 @@ def _embedding_input_wrangler(
     args: list[Any], kwargs: dict[str, Any]
 ) -> tuple[list[Any], dict[str, Any]]:
     """Remove arguments not present in the aten op signature."""
-    if "max_norm" in kwargs:
-        del kwargs["max_norm"]
-    if "norm_type" in kwargs:
-        del kwargs["norm_type"]
+    kwargs.pop("max_norm", None)
+    kwargs.pop("norm_type", None)
     return args, kwargs
 
 
@@ -265,8 +263,7 @@ def _empty_input_wrangler(
     args: list[Any], kwargs: dict[str, Any]
 ) -> tuple[list[Any], dict[str, Any]]:
     """Remove arguments not present in the aten op signature."""
-    if "requires_grad" in kwargs:
-        del kwargs["requires_grad"]
+    kwargs.pop("requires_grad", None)
     return args, kwargs
 
 
@@ -325,8 +322,7 @@ def _max_pool_input_wrangler(
     args: list[Any], kwargs: dict[str, Any]
 ) -> tuple[list[Any], dict[str, Any]]:
     # Remove return_indices argument because this op doesn't accept it
-    if "return_indices" in kwargs:
-        del kwargs["return_indices"]
+    kwargs.pop("return_indices", None)
     return args, kwargs
 
 
@@ -364,8 +360,7 @@ def _nll_loss_input_wrangler(
 def _nonzero_input_wrangler(
     args: list[Any], kwargs: dict[str, Any]
 ) -> tuple[list[Any], dict[str, Any]]:
-    if "as_tuple" in kwargs:
-        del kwargs["as_tuple"]
+    kwargs.pop("as_tuple", None)
     return args, kwargs
 
 
@@ -421,8 +416,7 @@ def _roll_input_wrangler(
 def _scalar_tensor_input_wrangler(
     args: list[Any], kwargs: dict[str, Any]
 ) -> tuple[list[Any], dict[str, Any]]:
-    if "requires_grad" in kwargs:
-        del kwargs["requires_grad"]
+    kwargs.pop("requires_grad", None)
     return args, kwargs