diff --git a/cmd/cloud-run/signifysecretrotator/Dockerfile b/cmd/cloud-run/signifysecretrotator/Dockerfile
index c2dd8951de18..10167fc4f5e9 100644
--- a/cmd/cloud-run/signifysecretrotator/Dockerfile
+++ b/cmd/cloud-run/signifysecretrotator/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.12.7-alpine3.20
+FROM python:3.13.1-alpine3.21
 
 # Allow statements and log messages to immediately appear in the Knative logs
 ENV PYTHONUNBUFFERED True
diff --git a/cmd/cloud-run/slack-message-sender/Dockerfile b/cmd/cloud-run/slack-message-sender/Dockerfile
index 5236ed89587e..6328d1d7c452 100644
--- a/cmd/cloud-run/slack-message-sender/Dockerfile
+++ b/cmd/cloud-run/slack-message-sender/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.13.1-alpine3.20
+FROM python:3.13.1-alpine3.21
 
 # Allow statements and log messages to immediately appear in the Knative logs
 ENV PYTHONUNBUFFERED True