diff --git a/techdocs/container.go b/techdocs/container.go
index a75aa908..e941d517 100644
--- a/techdocs/container.go
+++ b/techdocs/container.go
@@ -24,7 +24,7 @@ const nodeVersion = "22.23.3"
 // The base image, pinned by digest. It brings python3 + pip for mkdocs;
 // node comes from nodejs.org above. Renovate moves the digest.
 // renovate: datasource=docker depName=python
-const baseImageTag = "3.13-slim@sha256:70729b46c69b4f1e97c4822c1af3df53a1476cf5ddc6c087c0c10bc3a5678c2f"
+const baseImageTag = "3.15-slim@sha256:94d3426f1def7db4a106a232ac121bfd975393e5dfd40a619b955fae45fe7913"
 
 const defaultBaseImage = "python:" + baseImageTag
 
diff --git a/tests/python/Dockerfile b/tests/python/Dockerfile
index f1640e30..a987d1e3 100644
--- a/tests/python/Dockerfile
+++ b/tests/python/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.14-slim
+FROM python:3.15-slim
 
 ARG VERSION=dev
 ARG COMMIT=unknown