diff --git a/pkgs/by-name/al/algol68g/package.nix b/pkgs/by-name/al/algol68g/package.nix
index dbfb3c658df4..9784fa820839 100644
--- a/pkgs/by-name/al/algol68g/package.nix
+++ b/pkgs/by-name/al/algol68g/package.nix
@@ -15,12 +15,12 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "algol68g";
-  version = "3.12.0";
+  version = "3.12.1";
 
   src = fetchurl {
     # Uses archive.org because the original site removes older versions.
-    url = "https://web.archive.org/web/20260503173638/https://algol68genie.nl/algol68g-3.12.0.tar.gz";
-    hash = "sha256-fYjuivr6AKRK4Nn45Q+oglpTMnp+PhO6KOkGZjwVKn0=";
+    url = "https://web.archive.org/web/20260515052918/https://algol68genie.nl/algol68g-3.12.1.tar.gz";
+    hash = "sha256-Mdoca6W1Wyyv7WrmzaAW/fn0uLkXy6MwSDImVwB+mBk";
   };
 
   outputs = [