diff --git a/Dockerfile b/Dockerfile
index f6fc1499..e8c4b3d2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
  # 3.1.3-buster
-FROM ruby@sha256:55cd5fab4140db7a04f46921eafcd941be95f6c5687b01154d43e75479ba0fe9
+FROM ruby@sha256:45ca46a37e16d4f0b383ff6f400edc7e096361ac05c91ead86481ecc332e665e
 
 EXPOSE 4567:4567
 EXPOSE 35729:35729