diff --git a/packages/@aws-cdk/aws-lambda-python-alpha/lib/Dockerfile b/packages/@aws-cdk/aws-lambda-python-alpha/lib/Dockerfile
index 334b2a80ac4d9..3152f0f30cf14 100644
--- a/packages/@aws-cdk/aws-lambda-python-alpha/lib/Dockerfile
+++ b/packages/@aws-cdk/aws-lambda-python-alpha/lib/Dockerfile
@@ -6,6 +6,8 @@ FROM $IMAGE
 ARG PIP_INDEX_URL
 ARG PIP_EXTRA_INDEX_URL
 ARG HTTPS_PROXY
+# pipenv 2022.4.8 is the last version with Python 3.6 support
+ARG PIPENV_VERSION=2022.4.8
 ARG POETRY_VERSION=1.5.1
 
 # Add virtualenv path
@@ -31,8 +33,8 @@ RUN \
     mkdir /tmp/poetry-cache && \
 # Ensure all users can write to poetry cache
     chmod -R 777 /tmp/poetry-cache && \
-# pipenv 2022.4.8 is the last version with Python 3.6 support
-    pip install pipenv==2022.4.8 poetry==$POETRY_VERSION && \
+# Install pipenv and poetry
+    pip install pipenv==$PIPENV_VERSION poetry==$POETRY_VERSION && \
 # Ensure no temporary files remain in the caches
     rm -rf /tmp/pip-cache/* /tmp/poetry-cache/*