diff --git a/cross-js.nix b/cross-js.nix
index bca06c0e..aa8fb339 100644
--- a/cross-js.nix
+++ b/cross-js.nix
@@ -79,8 +79,8 @@ pkgs.mkShell ({
         (tool "alex")
         stdenv.cc.cc.lib ]) ++ (with pkgs.buildPackages; [
     ])
-    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc980" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
-    ++ pkgs.lib.optional (withHlint && (compiler-not-in (["ghc961" "ghc962" "ghc980" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "HLint")) (tool "hlint")
+    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
+    ++ pkgs.lib.optional (withHlint && (compiler-not-in (["ghc981" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "HLint")) (tool "hlint")
     ++ pkgs.lib.optional withIOG
         (with pkgs; [ cddl cbor-diag ]
         ++ map pkgs.lib.getDev (with pkgs; [
diff --git a/cross-windows.nix b/cross-windows.nix
index 0b533be7..9bfc07f3 100644
--- a/cross-windows.nix
+++ b/cross-windows.nix
@@ -161,8 +161,8 @@ pkgs.pkgsBuildBuild.mkShell ({
         (pkgsBuildBuild.haskell-nix.tool compiler-nix-name "happy" "1.20.1.1")
         (pkgsBuildBuild.haskell-nix.tool compiler-nix-name "alex" "3.2.7.3")
         stdenv.cc.cc.lib ])
-    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc980" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
-    ++ pkgs.lib.optional (withHlint && (compiler-not-in (["ghc961" "ghc962" "ghc980" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "HLint")) (tool "hlint")
+    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
+    ++ pkgs.lib.optional (withHlint && (compiler-not-in (["ghc981" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "HLint")) (tool "hlint")
     ++ pkgs.lib.optional withIOG
         (with pkgs.pkgsBuildBuild; [ cddl cbor-diag ]
         ++ map pkgs.lib.getDev (with pkgs; [
diff --git a/dynamic.nix b/dynamic.nix
index 22a605bc..1c759bfd 100644
--- a/dynamic.nix
+++ b/dynamic.nix
@@ -85,8 +85,8 @@ pkgs.mkShell {
         ]
         ++ pkgs.lib.optional pkgs.stdenv.hostPlatform.isLinux systemd
     )
-    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc980" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
-    ++ pkgs.lib.optional (withHlint && (compiler-not-in (["ghc961" "ghc962" "ghc980" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "HLint")) (tool "hlint")
+    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
+    ++ pkgs.lib.optional (withHlint && (compiler-not-in (["ghc981" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "HLint")) (tool "hlint")
     ++ pkgs.lib.optional withIOG
         (with pkgs; [
             cddl
diff --git a/flake.nix b/flake.nix
index d68cb153..bea5863a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -77,7 +77,7 @@
                       "ghc928"
                       "ghc947"
                       "ghc962"
-                      "ghc980"
+                      "ghc981"
                       "ghc99"] (compiler-nix-name:
                    pkgs.haskell-nix.compiler.${
                      (pkgs.haskell-nix.cabalProject' { inherit compiler-nix-name; }).args.compiler-nix-name});
diff --git a/static.nix b/static.nix
index 60a0dba9..52c1f29c 100644
--- a/static.nix
+++ b/static.nix
@@ -134,8 +134,8 @@ pkgs.mkShell (rec {
         (pkgs.pkg-config or pkgconfig)
         stdenv.cc.cc.lib ]) ++ (with pkgs.buildPackages; [
     ])
-    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc980" "ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
-    ++ pkgs.lib.optional (withHlint && (compiler-not-in ["ghc961" "ghc962" "ghc980" "ghc99" "ghc902"] "HLint")) (tool "hlint")
+    ++ pkgs.lib.optional (withHLS && (compiler-not-in (["ghc99"] ++ pkgs.lib.optional (pkgs.stdenv.hostPlatform.isDarwin && pkgs.stdenv.hostPlatform.isAarch64) "ghc902") "Haskell Language Server")) (tool "haskell-language-server")
+    ++ pkgs.lib.optional (withHlint && (compiler-not-in ["ghc981" "ghc99" "ghc902"] "HLint")) (tool "hlint")
     ++ pkgs.lib.optional withIOG (with pkgs; [ cddl cbor-diag ])
     ;
 })
diff --git a/tool-map.nix b/tool-map.nix
index ec005bdb..53f4ac93 100644
--- a/tool-map.nix
+++ b/tool-map.nix
@@ -8,10 +8,24 @@ compiler-nix-name: tool: {
   # HLS release. Therefore we rely on the HLS upstream repository to provide the proper configuration information.
   haskell-language-server = {pkgs, ...}: rec {
       # Use the github source of HLS that is tested with haskell.nix CI
-      src = pkgs.haskell-nix.sources."hls-2.0";
+      src = pkgs.haskell-nix.sources."hls-2.4";
       # `tool` normally ignores the `cabal.project` (if there is one in the hackage source).
       # We need to use the github one (since it has settings to make hls build).
       cabalProject = __readFile (src + "/cabal.project");
+      cabalProjectLocal = ''
+        repository head.hackage.ghc.haskell.org
+          url: https://ghc.gitlab.haskell.org/head.hackage/
+          secure: True
+          key-threshold: 3
+          root-keys:
+             f76d08be13e9a61a377a85e2fb63f4c5435d40f8feb3e12eb05905edb8cdea89
+             26021a13b401500c8eb2761ca95c61f2d625bfef951b939a8124ed12ecf07329
+             7541f32a4ccca4f97aea3b22f5e593ba2c0267546016b992dfadcd2fe944e55d
+          --sha256: sha256-aVI93DtHziicNn2mGli0YE+bC5BeT7mOQQETp2Thi68=
+
+        if impl(ghc < 9.7)
+          active-repositories: hackage.haskell.org
+      '';
       # sha256 for a `source-repository-package` in the `cabal.project` file.
       sha256map."https://github.com/pepeiborra/ekg-json"."7a0af7a8fd38045fd15fb13445bdcc7085325460" = "sha256-fVwKxGgM0S4Kv/4egVAAiAjV7QB5PBqMVMCfsv7otIQ=";
   };