diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 94b84f20f66..e6564dd2f84 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -24,7 +24,7 @@
     "ghcr.io/jungaretti/features/make:1": {},
     "ghcr.io/devcontainers/features/docker-in-docker:2.12.0": {},
     "ghcr.io/devcontainers/features/python:1": {
-      "version": "3.9"
+      "version": "3.11"
     },
     "ghcr.io/devcontainers-extra/features/poetry:2": {},
     "ghcr.io/devcontainers/features/node:1": {
diff --git a/backend/Dockerfile b/backend/Dockerfile
index 1d839f72e8c..87e9adaefd8 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -113,7 +113,7 @@ RUN cd /usr/local/deps/target/lib && \
     done
 
 
-FROM python:3.9-slim-bookworm as base
+FROM python:3.11-slim-bookworm as base
 
 RUN apt-get update && \
     apt-get install -y python3-dev python3-pip tar pkg-config curl libssh2-1 zlib1g libffi-dev default-libmysqlclient-dev libpq-dev tini git openssh-client corkscrew && \
diff --git a/backend/python/DevelopmentSetup.md b/backend/python/DevelopmentSetup.md
index 4bc885a96a3..c831313c8de 100644
--- a/backend/python/DevelopmentSetup.md
+++ b/backend/python/DevelopmentSetup.md
@@ -22,12 +22,12 @@ limitations under the License.
 For the Python plugin tests to run properly, the following steps must be taken:
 
 1. The following packages are required for Ubuntu: `libffi-dev default-libmysqlclient-dev libpq-dev`
-2. `python3.9` is required by the time of this document. 
-   - Try `deadsnakes` if you are using Ubuntu 22.04 or above, the `python3.9-dev` is required.
-   - Use `virtualenv` if you are having multiple python versions. `virtualenv -p python3.9 path/to/venv` and `source path/to/venv/bin/activate.sh` should do the trick
-3. both `mysql-client` and `postgresql` are required. 
+2. `python3.11` is required by the time of this document.
+   - Try `deadsnakes` if you are using Ubuntu 22.04 or above, the `python3.11-dev` is required.
+   - Use `virtualenv` if you are having multiple python versions. `virtualenv -p python3.11 path/to/venv` and `source path/to/venv/bin/activate.sh` should do the trick
+3. both `mysql-client` and `postgresql` are required.
    - `postgresql` is required for `psycopg2` to work
-4. [poetry](https://python-poetry.org/) is required. 
+4. [poetry](https://python-poetry.org/) is required.
    - run `cd backend/python/pydevlake && poetry install`
    - run `cd backend/python/plugins/azuredevops && poetry install`
 5. `sqlalchemy` won't work with `localhost` in the database connection string, use `127.0.0.1` instead
diff --git a/backend/python/plugins/azuredevops/pyproject.toml b/backend/python/plugins/azuredevops/pyproject.toml
index df7e8d2552d..74ee730f87b 100644
--- a/backend/python/plugins/azuredevops/pyproject.toml
+++ b/backend/python/plugins/azuredevops/pyproject.toml
@@ -21,7 +21,7 @@ authors = ["Hezheng Yin <hezheng@merico.dev>"]
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = "~3.9"
+python = ">=3.11,<3.12"
 pydevlake = { path = "../../pydevlake", develop = true }
 
 
diff --git a/backend/python/pydevlake/pyproject.toml b/backend/python/pydevlake/pyproject.toml
index 9f52bf821a5..c18cd9f62b3 100644
--- a/backend/python/pydevlake/pyproject.toml
+++ b/backend/python/pydevlake/pyproject.toml
@@ -22,7 +22,7 @@ license = "Apache-2.0"
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = "~3.9"
+python = ">=3.11,<3.12"
 sqlmodel = "^0.0.8"
 mysqlclient = "^2.1.1"
 requests = "^2.28.1"
diff --git a/backend/python/test/fakeplugin/pyproject.toml b/backend/python/test/fakeplugin/pyproject.toml
index 9f17ea3b30b..d72afa4f9b3 100644
--- a/backend/python/test/fakeplugin/pyproject.toml
+++ b/backend/python/test/fakeplugin/pyproject.toml
@@ -20,7 +20,7 @@ description = "Fake python plugin used only in tests"
 authors = []
 
 [tool.poetry.dependencies]
-python = "~3.9"
+python = ">=3.11,<3.12"
 pydevlake = { path = "../../pydevlake", develop = true }
 
 
diff --git a/backend/python/uv.sh b/backend/python/uv.sh
index 9e9d7696f18..b775b9787c0 100755
--- a/backend/python/uv.sh
+++ b/backend/python/uv.sh
@@ -50,7 +50,7 @@ sync_project() {
     rm -rf .venv
   fi
   if [ ! -x .venv/bin/python ]; then
-    uv venv --python "${DEVLAKE_PYTHON_VERSION:-3.9}" .venv
+    uv venv --python "${DEVLAKE_PYTHON_VERSION:-3.11}" .venv
   fi
   uv pip install --python .venv/bin/python -e .
 }