diff --git a/3.9/Dockerfile b/3.9/Dockerfile
index abce41d..544e3b0 100644
--- a/3.9/Dockerfile
+++ b/3.9/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9.6-slim-buster@sha256:172385ddb94fa7244e263f86e363c57812effe13216fca59169a2fb143d91dc8
+FROM python:3.9.6-slim-buster@sha256:8ffb28a4fca06fc0914dac67e801cf447df0225ea23ee1b42685de02f2555235
 
 # renovate: datasource=pypi depName=poetry versioning=semver
 ENV POETRY_VERSION 1.1.7