diff --git a/rmbuilder/Dockerfile b/rmbuilder/Dockerfile
index 487e80a..5b61dea 100644
--- a/rmbuilder/Dockerfile
+++ b/rmbuilder/Dockerfile
@@ -2,7 +2,7 @@
 
 ARG REDIS_VER=6.2.7
 ARG OSNICK=bullseye
-ARG OS=debian:bullseye-slim
+ARG OS=debian:11.6-slim
 
 # ARCH=x64|arm64v8|arm32v7
 ARG ARCH=x64