diff --git a/pkgs/by-name/mo/mopac/package.nix b/pkgs/by-name/mo/mopac/package.nix
index 2b9973a6b8a4..e9b4e90cf1ba 100644
--- a/pkgs/by-name/mo/mopac/package.nix
+++ b/pkgs/by-name/mo/mopac/package.nix
@@ -13,13 +13,13 @@ assert blas.isILP64 == lapack.isILP64;
 
 stdenv.mkDerivation rec {
   pname = "mopac";
-  version = "23.1.1";
+  version = "23.1.2";
 
   src = fetchFromGitHub {
     owner = "openmopac";
     repo = pname;
     rev = "v${version}";
-    hash = "sha256-sQoxLPVjxkLVaZWl/1pda5kgJI/X6msgCblKzV4EB6o=";
+    hash = "sha256-guMPXz7nQWxnmY4f+CGIAf3MBiV00GxSEdsZQ2fAjh4=";
   };
 
   nativeBuildInputs = [