diff --git a/contrib/pg_buffercache/Makefile b/contrib/pg_buffercache/Makefile
index 065d3d690a9..497dbeb2297 100644
--- a/contrib/pg_buffercache/Makefile
+++ b/contrib/pg_buffercache/Makefile
@@ -4,7 +4,8 @@ MODULE_big = pg_buffercache
 OBJS = pg_buffercache_pages.o $(WIN32RES)
 
 EXTENSION = pg_buffercache
-DATA = pg_buffercache--1.1.sql pg_buffercache--1.0--1.1.sql pg_buffercache--unpackaged--1.0.sql
+DATA = pg_buffercache--1.2.sql pg_buffercache--1.1--1.2.sql \
+	pg_buffercache--1.0--1.1.sql pg_buffercache--unpackaged--1.0.sql
 PGFILEDESC = "pg_buffercache - monitoring of shared buffer cache in real-time"
 
 ifdef USE_PGXS
diff --git a/contrib/pg_buffercache/pg_buffercache--1.1--1.2.sql b/contrib/pg_buffercache/pg_buffercache--1.1--1.2.sql
new file mode 100644
index 00000000000..5997aad29c1
--- /dev/null
+++ b/contrib/pg_buffercache/pg_buffercache--1.1--1.2.sql
@@ -0,0 +1,6 @@
+/* contrib/pg_buffercache/pg_buffercache--1.1--1.2.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pg_buffercache UPDATE TO '1.2'" to load this file. \quit
+
+ALTER FUNCTION pg_buffercache_pages() PARALLEL SAFE;
diff --git a/contrib/pg_buffercache/pg_buffercache--1.1.sql b/contrib/pg_buffercache/pg_buffercache--1.2.sql
similarity index 90%
rename from contrib/pg_buffercache/pg_buffercache--1.1.sql
rename to contrib/pg_buffercache/pg_buffercache--1.2.sql
index f3b6482fa62..6ee5d8435bd 100644
--- a/contrib/pg_buffercache/pg_buffercache--1.1.sql
+++ b/contrib/pg_buffercache/pg_buffercache--1.2.sql
@@ -1,4 +1,4 @@
-/* contrib/pg_buffercache/pg_buffercache--1.1.sql */
+/* contrib/pg_buffercache/pg_buffercache--1.2.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION pg_buffercache" to load this file. \quit
@@ -7,7 +7,7 @@
 CREATE FUNCTION pg_buffercache_pages()
 RETURNS SETOF RECORD
 AS 'MODULE_PATHNAME', 'pg_buffercache_pages'
-LANGUAGE C;
+LANGUAGE C PARALLEL SAFE;
 
 -- Create a view for convenient access.
 CREATE VIEW pg_buffercache AS
diff --git a/contrib/pg_buffercache/pg_buffercache.control b/contrib/pg_buffercache/pg_buffercache.control
index 5494e2fae52..a4d664f3fa7 100644
--- a/contrib/pg_buffercache/pg_buffercache.control
+++ b/contrib/pg_buffercache/pg_buffercache.control
@@ -1,5 +1,5 @@
 # pg_buffercache extension
 comment = 'examine the shared buffer cache'
-default_version = '1.1'
+default_version = '1.2'
 module_pathname = '$libdir/pg_buffercache'
 relocatable = true