diff --git a/12/alpine/Dockerfile b/12/alpine/Dockerfile
index 72adc40aaa..965cf1fe2f 100644
--- a/12/alpine/Dockerfile
+++ b/12/alpine/Dockerfile
@@ -22,8 +22,8 @@ ENV LANG en_US.utf8
 RUN mkdir /docker-entrypoint-initdb.d
 
 ENV PG_MAJOR 12
-ENV PG_VERSION 12beta4
-ENV PG_SHA256 422f5e2ad999126f505b44c2d56abe726a08ed7e50e2d268e9906c879831805f
+ENV PG_VERSION 12rc1
+ENV PG_SHA256 40facd3280d8565f37139d2c5df2b94fe68a064c5d2784f74fceae24820543f3
 
 RUN set -ex \
 	\