diff --git a/9.4/alpine/Dockerfile b/9.4/alpine/Dockerfile
index 572176ec8c..0a7538232f 100644
--- a/9.4/alpine/Dockerfile
+++ b/9.4/alpine/Dockerfile
@@ -22,8 +22,8 @@ ENV LANG en_US.utf8
 RUN mkdir /docker-entrypoint-initdb.d
 
 ENV PG_MAJOR 9.4
-ENV PG_VERSION 9.4.20
-ENV PG_SHA256 eeb1d8ddb2854c9e4d8b5cbd65665260c0ae8cbcb911003f24c2d82ccb97f87f
+ENV PG_VERSION 9.4.21
+ENV PG_SHA256 0049b4d239a00654e792997aff32a0be7a6bdd922b5ca97f1a06797cd4d06006
 
 RUN set -ex \
 	\