diff --git a/pkgs/by-name/mo/mopac/package.nix b/pkgs/by-name/mo/mopac/package.nix
index 4e8e29c993e1..44d3f690604b 100644
--- a/pkgs/by-name/mo/mopac/package.nix
+++ b/pkgs/by-name/mo/mopac/package.nix
@@ -12,13 +12,13 @@ assert blas.isILP64 == lapack.isILP64;
 
 stdenv.mkDerivation rec {
   pname = "mopac";
-  version = "22.1.1";
+  version = "23.0.0";
 
   src = fetchFromGitHub {
     owner = "openmopac";
     repo = pname;
     rev = "v${version}";
-    hash = "sha256-tdVb/u89EBggfG3Ofz1ICBE2ug4fbMsUWAILwJP9Ito=";
+    hash = "sha256-5Ybhnq99609mb1BCf7SfBOu14VfG54aF1bEf96yhbVI=";
   };
 
   nativeBuildInputs = [ gfortran cmake ];