diff --git a/pkgs/by-name/sd/sdcc/package.nix b/pkgs/by-name/sd/sdcc/package.nix
index eaac606fbdb7..e8c20ac045c3 100644
--- a/pkgs/by-name/sd/sdcc/package.nix
+++ b/pkgs/by-name/sd/sdcc/package.nix
@@ -18,11 +18,11 @@ assert lib.subtractLists [
 ] excludePorts == [];
 stdenv.mkDerivation (finalAttrs: {
   pname = "sdcc";
-  version = "4.2.0";
+  version = "4.4.0";
 
   src = fetchurl {
     url = "mirror://sourceforge/sdcc/sdcc-src-${finalAttrs.version}.tar.bz2";
-    hash = "sha256-tJuuHSO81gV6gsT/5WE/nNDLz9HpQOnYTEv+nfCowFM=";
+    hash = "sha256-rowSFl6xdoDf9EsyjYh5mWMGtyQe+jqDsuOy0veQanU=";
   };
 
   outputs = [ "out" "doc" "man" ];
diff --git a/pkgs/development/python-modules/fx2/default.nix b/pkgs/development/python-modules/fx2/default.nix
index f89334f8f60e..6991c3f4ab1b 100644
--- a/pkgs/development/python-modules/fx2/default.nix
+++ b/pkgs/development/python-modules/fx2/default.nix
@@ -9,14 +9,14 @@
 
 buildPythonPackage rec {
   pname = "fx2";
-  version = "unstable-2023-09-20";
+  version = "0.13";
   format = "setuptools";
 
   src = fetchFromGitHub {
     owner = "whitequark";
     repo = "libfx2";
-    rev = "73fa811818d56a86b82c12e07327946aeddd2b3e";
-    hash = "sha256-AGQPOVTdaUCUeVVNQTBmoNvz5CGxcBOK7+oL+X8AcIw=";
+    rev = "v${version}";
+    hash = "sha256-PtWxjT+97+EeNMN36zOT1+ost/w3lRRkaON3Cl3dpp4=";
   };
 
   nativeBuildInputs = [ sdcc ];