diff --git a/gke-deploy/doc/app/Dockerfile b/gke-deploy/doc/app/Dockerfile
index 58aefc766..7b79ac396 100644
--- a/gke-deploy/doc/app/Dockerfile
+++ b/gke-deploy/doc/app/Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM python:3.7-slim
+FROM python:3.13-slim
 RUN pip install flask
 WORKDIR /app
 COPY app.py /app/app.py