diff --git a/Dockerfile b/Dockerfile
index 093269a..d8f8e55 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM thallian/confd-env:latest
+FROM docker.io/thallian/confd-env:3.16
 
 RUN apk add --no-cache \
     postfix \