Try #1779:

Author: iohk-bors[bot]

ci.nix

@@ -54,7 +54,8 @@
         ghc884 = false; # Native version is used to boot 9.0.1
         ghc8107 = true;
         ghc902 = false;
-        ghc924 = true;
+        ghc924 = false;
+        ghc925 = true;
       }));
   crossSystems = nixpkgsName: nixpkgs: compiler-nix-name:
     # We need to use the actual nixpkgs version we're working with here, since the values
@@ -65,10 +66,10 @@
        || (system == "x86_64-darwin" && __elem compiler-nix-name ["ghc8107"]))) {
     inherit (lib.systems.examples) ghcjs;
   } // lib.optionalAttrs (nixpkgsName == "unstable"
-      && ((system == "x86_64-linux"  && __elem compiler-nix-name ["ghc8107" "ghc902" "ghc924"])
+      && ((system == "x86_64-linux"  && __elem compiler-nix-name ["ghc8107" "ghc902" "ghc925"])
        || (system == "x86_64-darwin" && __elem compiler-nix-name []))) { # TODO add ghc versions when we have more darwin build capacity
     inherit (lib.systems.examples) mingwW64;
-  } // lib.optionalAttrs (system == "x86_64-linux" && nixpkgsName == "unstable" && __elem compiler-nix-name ["ghc8107" "ghc902" "ghc922" "ghc923" "ghc924"]) {
+  } // lib.optionalAttrs (system == "x86_64-linux" && nixpkgsName == "unstable" && __elem compiler-nix-name ["ghc8107" "ghc902" "ghc922" "ghc923" "ghc924" "ghc925"]) {
     # Musl cross only works on linux
     # aarch64 cross only works on linux
     inherit (lib.systems.examples) musl64 aarch64-multiplatform;

docs/tutorials/development/default.nix

@@ -26,5 +26,5 @@ in pkgs.haskell-nix.project {
     src = ./.;
   };
   # Specify the GHC version to use.
-  compiler-nix-name = "ghc924"; # Not required for `stack.yaml` based projects.
-}
+  compiler-nix-name = "ghc925"; # Not required for `stack.yaml` based projects.
+}

docs/tutorials/getting-started-flakes/flake.nix

@@ -12,7 +12,7 @@
           helloProject =
             final.haskell-nix.project' {
               src = ./.;
-              compiler-nix-name = "ghc924";
+              compiler-nix-name = "ghc925";
               # This is used by `nix develop .` to open a shell for use with
               # `cabal`, `hlint` and `haskell-language-server`
               shell.tools = {
@@ -38,4 +38,4 @@
       # Built by `nix build .`
       packages.default = flake.packages."hello:exe:hello";
     });
-}
+}

docs/tutorials/getting-started/default.nix

@@ -26,5 +26,5 @@ in pkgs.haskell-nix.project {
     src = ./.;
   };
   # Specify the GHC version to use.
-  compiler-nix-name = "ghc924"; # Not required for `stack.yaml` based projects.
-}
+  compiler-nix-name = "ghc925"; # Not required for `stack.yaml` based projects.
+}

flake.nix

@@ -61,7 +61,7 @@
   };
 
   outputs = { self, nixpkgs, nixpkgs-unstable, nixpkgs-2105, nixpkgs-2111, nixpkgs-2205, flake-utils, tullia, ... }@inputs:
-    let compiler = "ghc924";
+    let compiler = "ghc925";
       config = import ./config.nix;
     in {
       inherit config;