diff --git a/nix/ext/pg_cron.nix b/nix/ext/pg_cron.nix
index 468cc9834..5c546c797 100644
--- a/nix/ext/pg_cron.nix
+++ b/nix/ext/pg_cron.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation rec {
   pname = "pg_cron";
-  version = "1.6.2";
+  version = "1.6.4";
 
   buildInputs = [ postgresql ];
 
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     owner  = "citusdata";
     repo   = pname;
     rev    = "v${version}";
-    hash = "sha256-/dD1gX0+RRsBFIjSV9TVk+ppPw0Jrzssl+rRZ2qAp4w=";
+    hash = "sha256-t1DpFkPiSfdoGG2NgNT7g1lkvSooZoRoUrix6cBID40=";
   };
 
   installPhase = ''