diff --git a/docker/Dockerfile.amd64 b/docker/Dockerfile.amd64
index c785b42..e83d721 100644
--- a/docker/Dockerfile.amd64
+++ b/docker/Dockerfile.amd64
@@ -1,4 +1,4 @@
-FROM amd64/docker:20.10-dind
+FROM amd64/docker:20.10-dind@sha256:12521ff42db0d1e1d99f89c7dea6aa6e2d028c20cb42dad8285503735ddf678d
 
 LABEL maintainer="Robert Kaussow <mail@thegeeklab.de>"
 LABEL org.opencontainers.image.authors="Robert Kaussow <mail@thegeeklab.de>"
diff --git a/docker/Dockerfile.arm64 b/docker/Dockerfile.arm64
index 2a99ac5..317d2cd 100644
--- a/docker/Dockerfile.arm64
+++ b/docker/Dockerfile.arm64
@@ -1,4 +1,4 @@
-FROM arm64v8/docker:20.10-dind
+FROM arm64v8/docker:20.10-dind@sha256:009bdea1b7cf4de7f5f7febf8cce1f322b92598927318c78cd2c012d8c0dc866
 
 LABEL maintainer="Robert Kaussow <mail@thegeeklab.de>"
 LABEL org.opencontainers.image.authors="Robert Kaussow <mail@thegeeklab.de>"