Try #1566:

Author: iohk-bors[bot]

build.nix

@@ -34,7 +34,7 @@ in rec {
             "ghc884" = "3.3.6";
           }.compiler-nix-name or "latest";
       };
-    } // pkgs.lib.optionalAttrs (!__elem compiler-nix-name ["ghc921" "ghc922" "ghc923"]) {
+    } // pkgs.lib.optionalAttrs (!__elem compiler-nix-name ["ghc921" "ghc922" "ghc923" "ghc924"]) {
       hls-latest = tool compiler-nix-name "haskell-language-server" { inherit evalPackages; };
     })
   );

ci.nix

@@ -41,7 +41,7 @@
       ghc884 = false; # Native version is used to boot 9.0.1
       ghc8107 = true;
       ghc902 = true;
-      ghc923 = true;
+      ghc924 = true;
     });
   systems = nixpkgsName: nixpkgs: compiler-nix-name: nixpkgs.lib.genAttrs (
     nixpkgs.lib.filter (v:
@@ -62,14 +62,14 @@
     # of 'lib.systems.examples' are not understood between all versions
     let lib = nixpkgs.lib;
     in lib.optionalAttrs (nixpkgsName == "unstable"
-      && ((system == "x86_64-linux"  && __elem compiler-nix-name ["ghc865" "ghc884" "ghc8107"]) 
+      && ((system == "x86_64-linux"  && __elem compiler-nix-name ["ghc865" "ghc884" "ghc8107"])
        || (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" "ghc923"]) 
+      && ((system == "x86_64-linux"  && __elem compiler-nix-name ["ghc8107" "ghc902" "ghc924"])
        || (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"]) {
+  } // lib.optionalAttrs (system == "x86_64-linux" && nixpkgsName == "unstable" && __elem compiler-nix-name ["ghc8107" "ghc902" "ghc922" "ghc923" "ghc924"]) {
     # Musl cross only works on linux
     # aarch64 cross only works on linux
     inherit (lib.systems.examples) musl64 aarch64-multiplatform;

docs/reference/supported-ghc-versions.md

@@ -27,7 +27,7 @@ really should use an instance of Nixpkgs provided by `haskell.nix` itself.
 | unstable         | `nixpkgs-unstable` | 8.8.4       | `ghc884`              | No            |
 | unstable         | `nixpkgs-unstable` | 8.10.7      | `ghc8107`             | Yes           |
 | unstable         | `nixpkgs-unstable` | 9.0.2       | `ghc902`              | Yes           |
-| unstable         | `nixpkgs-unstable` | 9.2.3       | `ghc923`              | Yes           |
+| unstable         | `nixpkgs-unstable` | 9.2.4       | `ghc924`              | Yes           |
 
 See [ci.nix](https://github.com/input-output-hk/haskell.nix/blob/master/ci.nix)
 for the source of truth about what is built and tested (in the off chance this

flake.nix

@@ -60,7 +60,7 @@
   };
 
   outputs = { self, nixpkgs, nixpkgs-unstable, nixpkgs-2105, nixpkgs-2111, nixpkgs-2205, flake-utils, ... }@inputs:
-    let compiler = "ghc923";
+    let compiler = "ghc924";
       config = import ./config.nix;
     in {
       inherit config;