diff --git a/sagemaker-core/src/sagemaker/core/workflow/utilities.py b/sagemaker-core/src/sagemaker/core/workflow/utilities.py
index c07a31c51e..a74ce0c6d9 100644
--- a/sagemaker-core/src/sagemaker/core/workflow/utilities.py
+++ b/sagemaker-core/src/sagemaker/core/workflow/utilities.py
@@ -210,6 +210,9 @@ def get_processing_code_hash(code: str, source_dir: str, dependencies: List[str]
         str: A hash string representing the unique code artifact(s) for the step
     """
 
+    dependencies = dependencies or []
+
+
     # FrameworkProcessor
     if source_dir:
         source_dir_url = urlparse(source_dir)
@@ -245,6 +248,9 @@ def get_training_code_hash(
     Returns:
         str: A hash string representing the unique code artifact(s) for the step
     """
+    dependencies = dependencies or []
+
+
     from sagemaker.core.workflow import is_pipeline_variable
 
     if not is_pipeline_variable(source_dir) and not is_pipeline_variable(entry_point):
diff --git a/sagemaker-core/tests/unit/workflow/test_utilities.py b/sagemaker-core/tests/unit/workflow/test_utilities.py
index 5e9ed7bbbd..e6541b155c 100644
--- a/sagemaker-core/tests/unit/workflow/test_utilities.py
+++ b/sagemaker-core/tests/unit/workflow/test_utilities.py
@@ -325,6 +325,64 @@ def test_get_training_code_hash_pipeline_variable(self):
 
             assert result is None
 
+    def test_get_training_code_hash_with_none_dependencies_source_dir(self):
+        """Test get_training_code_hash with source_dir and dependencies=None does not raise TypeError"""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            entry_file = Path(temp_dir, "train.py")
+            entry_file.write_text("print('training')")
+
+            result = get_training_code_hash(
+                entry_point=str(entry_file), source_dir=temp_dir, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
+
+    def test_get_training_code_hash_with_entry_point_only_and_none_dependencies(self):
+        """Test get_training_code_hash with entry_point only and dependencies=None returns valid hash"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
+            f.write("print('training')")
+            temp_file = f.name
+
+        try:
+            result = get_training_code_hash(
+                entry_point=temp_file, source_dir=None, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
+        finally:
+            os.unlink(temp_file)
+
+    def test_get_processing_code_hash_with_none_dependencies_source_dir(self):
+        """Test get_processing_code_hash with source_dir and dependencies=None does not raise TypeError"""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            code_file = Path(temp_dir, "script.py")
+            code_file.write_text("print('hello')")
+
+            result = get_processing_code_hash(
+                code=str(code_file), source_dir=temp_dir, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
+
+    def test_get_processing_code_hash_with_none_dependencies_code_only(self):
+        """Test get_processing_code_hash with code only and dependencies=None does not raise TypeError"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
+            f.write("print('hello')")
+            temp_file = f.name
+
+        try:
+            result = get_processing_code_hash(
+                code=temp_file, source_dir=None, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
+        finally:
+            os.unlink(temp_file)
+
     def test_validate_step_args_input_valid(self):
         """Test validate_step_args_input with valid input"""
         step_args = _StepArguments(