diff --git a/9.6/alpine/Dockerfile b/9.6/alpine/Dockerfile
index 9878023ba5..d1bf30514e 100644
--- a/9.6/alpine/Dockerfile
+++ b/9.6/alpine/Dockerfile
@@ -22,8 +22,8 @@ ENV LANG en_US.utf8
 RUN mkdir /docker-entrypoint-initdb.d
 
 ENV PG_MAJOR 9.6
-ENV PG_VERSION 9.6.3
-ENV PG_SHA256 1645b3736901f6d854e695a937389e68ff2066ce0cde9d73919d6ab7c995b9c6
+ENV PG_VERSION 9.6.4
+ENV PG_SHA256 2b3ab16d82e21cead54c08b95ce3ac480696944a68603b6c11b3205b7376ce13
 
 RUN set -ex \
 	\