diff --git a/gitlab/dbt/serverless-ci-dbt.yml b/gitlab/dbt/serverless-ci-dbt.yml
index cedc6601..a10f2a5a 100644
--- a/gitlab/dbt/serverless-ci-dbt.yml
+++ b/gitlab/dbt/serverless-ci-dbt.yml
@@ -5,6 +5,8 @@ variables:
   DAGSTER_DBT_PROJECT_NAME: $DAGSTER_DBT_LOCATION_NAME
   DAGSTER_DBT_PROJECT_DIR: "${CI_PROJECT_DIR}"
   DAGSTER_DBT_PACKAGE_DATA_DIR: "${CI_PROJECT_DIR}/$DAGSTER_DBT_PROJECT_NAME/dbt-project"
+  # Python versions 3.8 to 3.11 are supported
+  PYTHON_VERSION: '3.8'
 
 deploy-branch:
   stage: deploy
diff --git a/gitlab/serverless-ci.yml b/gitlab/serverless-ci.yml
index 1a74fddc..ee49d856 100644
--- a/gitlab/serverless-ci.yml
+++ b/gitlab/serverless-ci.yml
@@ -2,6 +2,8 @@ variables:
   DISABLE_FAST_DEPLOYS:
   DAGSTER_CLOUD_URL: $DAGSTER_CLOUD_URL
   DAGSTER_CLOUD_API_TOKEN: $DAGSTER_CLOUD_API_TOKEN
+  # Python versions 3.8 to 3.11 are supported
+  PYTHON_VERSION: '3.8'
 
 deploy-branch:
   stage: deploy
diff --git a/src/gitlab_action/deploy.py b/src/gitlab_action/deploy.py
index 8b869252..887e87c0 100755
--- a/src/gitlab_action/deploy.py
+++ b/src/gitlab_action/deploy.py
@@ -8,6 +8,9 @@
 
 
 def deploy(dagster_cloud_yaml_file, deployment=None):
+    # Use 3.8 as default version for backward compatibility
+    python_version = os.getenv("PYTHON_VERSION", "3.8")
+
     url = os.environ["DAGSTER_CLOUD_URL"]
     if not os.getenv("SERVERLESS_BASE_IMAGE_PREFIX"):
         base_image_prefix = "657821118200.dkr.ecr.us-west-2.amazonaws.com/dagster-cloud-serverless-base-"
@@ -39,6 +42,7 @@ def deploy(dagster_cloud_yaml_file, deployment=None):
                 f"--deps-cache-to={deps_cache}",
                 f"--commit-hash={commit}",
                 f"--git-url={commit_url}",
+                f"--python-version={python_version}",
             ]
             if deployment:
                 command_args.append(f"--url={url}/{deployment}")