diff --git a/pkgs/development/compilers/ghc/9.12.5.nix b/pkgs/development/compilers/ghc/9.12.5.nix
index 0e4286f39706..855f7d75b4d2 100644
--- a/pkgs/development/compilers/ghc/9.12.5.nix
+++ b/pkgs/development/compilers/ghc/9.12.5.nix
@@ -1,5 +1,5 @@
 import ./common-hadrian.nix {
-  version = "9.12.4.20260606";
-  url = "https://downloads.haskell.org/~ghc/9.12.5-rc1/ghc-9.12.4.20260606-src.tar.gz";
-  sha256 = "f78e3c6aee5c769b225f20b0ea17d03ca8df28f56e02e75d5318c60c8132753f";
+  version = "9.12.4.20260614";
+  url = "https://downloads.haskell.org/~ghc/9.12.5-rc2/ghc-9.12.4.20260614-src.tar.gz";
+  sha256 = "3ab5987e18dafff3bc8d62ea6934e2edc0dd2151454af044790cd1074070fd4b";
 }