diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b6f9f12..bd76556 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.13"]
+        python-version: ["3.11","3.12","3.13","3.14"]
 
     steps:
     - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
diff --git a/pyproject.toml b/pyproject.toml
index 639274c..290834b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,14 +7,17 @@ name = "aws-durable-execution-sdk-python"
 dynamic = ["version"]
 description = 'This the Python SDK for AWS Lambda Durable Functions.'
 readme = "README.md"
-requires-python = ">=3.13"
+requires-python = ">=3.11"
 license = "Apache-2.0"
 keywords = []
 authors = [{ name = "yaythomas", email = "tgaigher@amazon.com" }]
 classifiers = [
   "Development Status :: 4 - Beta",
   "Programming Language :: Python",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
 ]
diff --git a/src/aws_durable_execution_sdk_python/lambda_service.py b/src/aws_durable_execution_sdk_python/lambda_service.py
index 8769eca..5afdb5d 100644
--- a/src/aws_durable_execution_sdk_python/lambda_service.py
+++ b/src/aws_durable_execution_sdk_python/lambda_service.py
@@ -22,10 +22,10 @@
 
     from aws_durable_execution_sdk_python.identifier import OperationIdentifier
 
-ReplayChildren: TypeAlias = bool  # noqa UP040 ignore due to python3.11 minimum version
-OperationPayload: TypeAlias = str  # noqa UP040 ignore due to python3.11 minimum version
-TimeoutSeconds: TypeAlias = int  # noqa UP040 ignore due to python3.11 minimum version
-
+# Replace with `type` it when dropping support to Python 3.11
+ReplayChildren: TypeAlias = bool
+OperationPayload: TypeAlias = str
+TimeoutSeconds: TypeAlias = int
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/aws_durable_execution_sdk_python/serdes.py b/src/aws_durable_execution_sdk_python/serdes.py
index 24a0fae..d589629 100644
--- a/src/aws_durable_execution_sdk_python/serdes.py
+++ b/src/aws_durable_execution_sdk_python/serdes.py
@@ -415,10 +415,14 @@ def deserialize(self, data: str, context: SerDesContext | None = None) -> Any:
         if not (isinstance(obj, dict) and TYPE_TOKEN in obj and VALUE_TOKEN in obj):
             msg = 'Malformed envelope: missing "t" or "v" at root.'
             raise SerDesError(msg)
-        if obj[TYPE_TOKEN] not in TypeTag:
+        # Python 3.11 compatibility: Using try-except instead of 'in' operator
+        # because checking 'str in EnumType' raises TypeError in Python 3.11
+        try:
+            tag = TypeTag(obj[TYPE_TOKEN])
+        except ValueError:
             msg = f'Unknown type tag: "{obj[TYPE_TOKEN]}"'
-            raise SerDesError(msg)
-        tag = TypeTag(obj[TYPE_TOKEN])
+            raise SerDesError(msg) from None
+
         return self._codec.decode(tag, obj[VALUE_TOKEN])
 
     def _to_json_serializable(self, obj: Any) -> Any: