diff --git a/Dockerfile b/Dockerfile
index f6fc1499..27a8e17e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
  # 3.1.3-buster
-FROM ruby@sha256:55cd5fab4140db7a04f46921eafcd941be95f6c5687b01154d43e75479ba0fe9
+FROM ruby@sha256:7738097e604fac41fd39eb0030ea0ed5b40968f89c6268911bc96e58c32e31fd
 
 EXPOSE 4567:4567
 EXPOSE 35729:35729