diff --git a/pkgs/misc/emulators/retroarch/cores.nix b/pkgs/misc/emulators/retroarch/cores.nix
index 1eca08be3b82..84a24e543e68 100644
--- a/pkgs/misc/emulators/retroarch/cores.nix
+++ b/pkgs/misc/emulators/retroarch/cores.nix
@@ -523,6 +523,7 @@ in
 
   mesen = mkLibRetroCore {
     core = "mesen";
+    version = "unstable-2021-11-22";
     description = "Port of Mesen to libretro";
     license = lib.licenses.gpl3Only;
     makefile = "Makefile";
diff --git a/pkgs/misc/emulators/retroarch/hashes.json b/pkgs/misc/emulators/retroarch/hashes.json
index 3f264a6959f1..6269cbd01aa3 100644
--- a/pkgs/misc/emulators/retroarch/hashes.json
+++ b/pkgs/misc/emulators/retroarch/hashes.json
@@ -280,10 +280,10 @@
         "fetchSubmodules": false
     },
     "mesen": {
-        "owner": "SourMesen",
+        "owner": "libretro",
         "repo": "mesen",
-        "rev": "86326e832974d984846ae078e568c023a5f76f1f",
-        "sha256": "At5rhlJ6rAnXaQrmRA1NtCCi+Ff/ytlt5dwsaXZhxXg=",
+        "rev": "094d82bf724448426acbaad45e83bc38994e32f6",
+        "sha256": "9+AqZRv8lugNNa+ZZzIPJNO87J1aBUEiOggL8aYno1M=",
         "fetchSubmodules": false
     },
     "meteor": {
diff --git a/pkgs/misc/emulators/retroarch/update.py b/pkgs/misc/emulators/retroarch/update.py
index 05d72a55115d..844a8e545955 100755
--- a/pkgs/misc/emulators/retroarch/update.py
+++ b/pkgs/misc/emulators/retroarch/update.py
@@ -50,7 +50,7 @@ CORES = {
     "mame2015": {"repo": "mame2015-libretro"},
     "mame2016": {"repo": "mame2016-libretro"},
     "melonds": {"repo": "melonds"},
-    "mesen": {"repo": "mesen", "owner": "SourMesen"},
+    "mesen": {"repo": "mesen"},
     "meteor": {"repo": "meteor-libretro"},
     "mgba": {"repo": "mgba"},
     "mupen64plus": {"repo": "mupen64plus-libretro-nx"},