diff --git a/pkgs/by-name/gp/gpredict-unstable/package.nix b/pkgs/by-name/gp/gpredict-unstable/package.nix
index b048563a747b..7d8f43238c06 100644
--- a/pkgs/by-name/gp/gpredict-unstable/package.nix
+++ b/pkgs/by-name/gp/gpredict-unstable/package.nix
@@ -10,8 +10,7 @@
   goocanvas2 = goocanvas3;
 }).overrideAttrs
   (finalAttrs: {
-    # Next version is 2.4.0
-    version = "2.4.0-unstable-2024-09-17";
+    version = "2.2.1-unstable-2024-09-17";
 
     src = fetchFromGitHub {
       owner = "csete";