diff --git a/requirements/dev.txt b/requirements/dev.txt
index e449c5e919..9c4ec1d816 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -8,7 +8,7 @@ pytest-cov==5.0.0
 # type checking and related stubs
 # mypy adds new rules in new minor versions, which could cause our PR check to fail
 # here we fix its version and upgrade it manually in the future
-mypy==1.11.2
+mypy==1.13.0
 types-pywin32==308.0.0.20241029
 types-PyYAML==6.0.12.20240917
 types-chevron==0.14.2.20240310
diff --git a/samcli/hook_packages/terraform/hooks/prepare/resource_linking.py b/samcli/hook_packages/terraform/hooks/prepare/resource_linking.py
index 7b1e339644..d5ca491af2 100644
--- a/samcli/hook_packages/terraform/hooks/prepare/resource_linking.py
+++ b/samcli/hook_packages/terraform/hooks/prepare/resource_linking.py
@@ -357,7 +357,7 @@ def _link_using_linking_fields(self, cfn_resource: Dict) -> None:
             child_resources_linking_attributes_logical_id_mapping,
         )
 
-        dest_resources = [
+        dest_resources: List[ReferenceType] = [
             (
                 LogicalIdReference(
                     value=child_resources_linking_attributes_logical_id_mapping[value][0],
diff --git a/samcli/lib/build/workflow_config.py b/samcli/lib/build/workflow_config.py
index 4725aece49..1fe489c38b 100644
--- a/samcli/lib/build/workflow_config.py
+++ b/samcli/lib/build/workflow_config.py
@@ -240,7 +240,7 @@ def get_workflow_config(
         ) from ex
 
 
-def supports_specified_workflow(specified_workflow: str) -> bool:
+def supports_specified_workflow(specified_workflow: Optional[str]) -> bool:
     """
     Given a specified workflow, returns whether it is supported in container builds,
     can be used to overwrite runtime and get docker image or not
diff --git a/samcli/lib/sync/flows/layer_sync_flow.py b/samcli/lib/sync/flows/layer_sync_flow.py
index a8e60f0c09..5d094b1db5 100644
--- a/samcli/lib/sync/flows/layer_sync_flow.py
+++ b/samcli/lib/sync/flows/layer_sync_flow.py
@@ -409,8 +409,8 @@ def sync(self) -> None:
             return
 
         # Check function uses layer
-        old_layer_arn = [layer_arn for layer_arn in layer_arns if layer_arn.startswith(self._layer_arn)]
-        old_layer_arn = old_layer_arn[0] if len(old_layer_arn) == 1 else None
+        old_layer_arns = [layer_arn for layer_arn in layer_arns if layer_arn.startswith(self._layer_arn)]
+        old_layer_arn = old_layer_arns[0] if len(old_layer_arns) == 1 else None
         if not old_layer_arn:
             LOG.warning(
                 "%sLambda Function (%s) does not have layer (%s).%s",