diff --git a/contrib/pgstattuple/Makefile b/contrib/pgstattuple/Makefile
index 6083dabefd..e732680dea 100644
--- a/contrib/pgstattuple/Makefile
+++ b/contrib/pgstattuple/Makefile
@@ -4,7 +4,9 @@ MODULE_big	= pgstattuple
 OBJS		= pgstattuple.o pgstatindex.o pgstatapprox.o $(WIN32RES)
 
 EXTENSION = pgstattuple
-DATA = pgstattuple--1.3.sql pgstattuple--1.2--1.3.sql pgstattuple--1.1--1.2.sql pgstattuple--1.0--1.1.sql pgstattuple--unpackaged--1.0.sql
+DATA = pgstattuple--1.4.sql pgstattuple--1.3--1.4.sql \
+	pgstattuple--1.2--1.3.sql pgstattuple--1.1--1.2.sql \
+	pgstattuple--1.0--1.1.sql pgstattuple--unpackaged--1.0.sql
 PGFILEDESC = "pgstattuple - tuple-level statistics"
 
 REGRESS = pgstattuple
diff --git a/contrib/pgstattuple/pgstattuple--1.3--1.4.sql b/contrib/pgstattuple/pgstattuple--1.3--1.4.sql
new file mode 100644
index 0000000000..913065026f
--- /dev/null
+++ b/contrib/pgstattuple/pgstattuple--1.3--1.4.sql
@@ -0,0 +1,13 @@
+/* contrib/pgstattuple/pgstattuple--1.3--1.4.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pgstattuple UPDATE TO '1.4'" to load this file. \quit
+
+ALTER FUNCTION pgstattuple(text) PARALLEL SAFE;
+ALTER FUNCTION pgstatindex(text) PARALLEL SAFE;
+ALTER FUNCTION pg_relpages(text) PARALLEL SAFE;
+ALTER FUNCTION pgstatginindex(regclass) PARALLEL SAFE;
+ALTER FUNCTION pgstattuple(regclass) PARALLEL SAFE;
+ALTER FUNCTION pgstatindex(regclass) PARALLEL SAFE;
+ALTER FUNCTION pg_relpages(regclass) PARALLEL SAFE;
+ALTER FUNCTION pgstattuple_approx(regclass) PARALLEL SAFE;
diff --git a/contrib/pgstattuple/pgstattuple--1.3.sql b/contrib/pgstattuple/pgstattuple--1.4.sql
similarity index 92%
rename from contrib/pgstattuple/pgstattuple--1.3.sql
rename to contrib/pgstattuple/pgstattuple--1.4.sql
index f3996e74a8..69f2002566 100644
--- a/contrib/pgstattuple/pgstattuple--1.3.sql
+++ b/contrib/pgstattuple/pgstattuple--1.4.sql
@@ -14,7 +14,7 @@ CREATE FUNCTION pgstattuple(IN relname text,
     OUT free_space BIGINT,		-- free space in bytes
     OUT free_percent FLOAT8)		-- free space in %
 AS 'MODULE_PATHNAME', 'pgstattuple'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FUNCTION pgstatindex(IN relname text,
     OUT version INT,
@@ -28,12 +28,12 @@ CREATE FUNCTION pgstatindex(IN relname text,
     OUT avg_leaf_density FLOAT8,
     OUT leaf_fragmentation FLOAT8)
 AS 'MODULE_PATHNAME', 'pgstatindex'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FUNCTION pg_relpages(IN relname text)
 RETURNS BIGINT
 AS 'MODULE_PATHNAME', 'pg_relpages'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 /* New stuff in 1.1 begins here */
 
@@ -42,7 +42,7 @@ CREATE FUNCTION pgstatginindex(IN relname regclass,
     OUT pending_pages INT4,
     OUT pending_tuples BIGINT)
 AS 'MODULE_PATHNAME', 'pgstatginindex'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 /* New stuff in 1.2 begins here */
 
@@ -57,7 +57,7 @@ CREATE FUNCTION pgstattuple(IN reloid regclass,
     OUT free_space BIGINT,		-- free space in bytes
     OUT free_percent FLOAT8)		-- free space in %
 AS 'MODULE_PATHNAME', 'pgstattuplebyid'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FUNCTION pgstatindex(IN relname regclass,
     OUT version INT,
@@ -71,12 +71,12 @@ CREATE FUNCTION pgstatindex(IN relname regclass,
     OUT avg_leaf_density FLOAT8,
     OUT leaf_fragmentation FLOAT8)
 AS 'MODULE_PATHNAME', 'pgstatindexbyid'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FUNCTION pg_relpages(IN relname regclass)
 RETURNS BIGINT
 AS 'MODULE_PATHNAME', 'pg_relpagesbyid'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 /* New stuff in 1.3 begins here */
 
@@ -92,4 +92,4 @@ CREATE FUNCTION pgstattuple_approx(IN reloid regclass,
     OUT approx_free_space BIGINT,       -- estimated free space in bytes
     OUT approx_free_percent FLOAT8)     -- free space in % (based on estimate)
 AS 'MODULE_PATHNAME', 'pgstattuple_approx'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
diff --git a/contrib/pgstattuple/pgstattuple.control b/contrib/pgstattuple/pgstattuple.control
index c03b180143..fa328fd664 100644
--- a/contrib/pgstattuple/pgstattuple.control
+++ b/contrib/pgstattuple/pgstattuple.control
@@ -1,5 +1,5 @@
 # pgstattuple extension
 comment = 'show tuple-level statistics'
-default_version = '1.3'
+default_version = '1.4'
 module_pathname = '$libdir/pgstattuple'
 relocatable = true