diff --git a/pkgs/development/python-modules/fx2/default.nix b/pkgs/development/python-modules/fx2/default.nix
index 1df4625a681..a691f3723d5 100644
--- a/pkgs/development/python-modules/fx2/default.nix
+++ b/pkgs/development/python-modules/fx2/default.nix
@@ -9,13 +9,13 @@
 
 buildPythonPackage rec {
   pname = "fx2";
-  version = "0.11";
+  version = "unstable-2023-09-20";
 
   src = fetchFromGitHub {
     owner = "whitequark";
     repo = "libfx2";
-    rev = "v${version}";
-    hash = "sha256-uJpXsUMFqJY7mjj1rtfc0XWEfNDxO1xXobgBDGFHnp4=";
+    rev = "73fa811818d56a86b82c12e07327946aeddd2b3e";
+    hash = "sha256-AGQPOVTdaUCUeVVNQTBmoNvz5CGxcBOK7+oL+X8AcIw=";
   };
 
   nativeBuildInputs = [ sdcc ];