diff --git a/k8s-tools/Dockerfile b/k8s-tools/Dockerfile
index bd3b4ec..d4ae073 100644
--- a/k8s-tools/Dockerfile
+++ b/k8s-tools/Dockerfile
@@ -1,7 +1,7 @@
 #
 # Base image
 #
-FROM --platform=linux/amd64 debian:bullseye
+FROM --platform=linux/amd64 debian:bullseye-20260610@sha256:68cf0d859b046494f3c4288171bc477580e424f981d08f2a77742b982c32a38f
 
 ARG http_proxy=${http_proxy:-}
 ARG https_proxy=${https_proxy:-}