diff --git a/flake.lock b/flake.lock
index 05bfa0f6d4..a6c12959ae 100644
--- a/flake.lock
+++ b/flake.lock
@@ -452,11 +452,11 @@
     },
     "nixpkgs-2411": {
       "locked": {
-        "lastModified": 1748037224,
-        "narHash": "sha256-92vihpZr6dwEMV6g98M5kHZIttrWahb9iRPBm1atcPk=",
+        "lastModified": 1751290243,
+        "narHash": "sha256-kNf+obkpJZWar7HZymXZbW+Rlk3HTEIMlpc6FCNz0Ds=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f09dede81861f3a83f7f06641ead34f02f37597f",
+        "rev": "5ab036a8d97cb9476fbe81b09076e6e91d15e1b6",
         "type": "github"
       },
       "original": {
@@ -468,11 +468,11 @@
     },
     "nixpkgs-2505": {
       "locked": {
-        "lastModified": 1757716134,
-        "narHash": "sha256-OYoZLWvmCnCTCJQwaQlpK1IO5nkLnLLoUW8wwmPmrfU=",
+        "lastModified": 1762303001,
+        "narHash": "sha256-6Q5fx8I7kI+uHL97pdpUnTm1Uu+OazpHfnv+DCAihtE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e85b5aa112a98805a016bbf6291e726debbc448a",
+        "rev": "139de9c2cb757650424fe8aa2a980eaa93a9e733",
         "type": "github"
       },
       "original": {
@@ -484,11 +484,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1759070547,
-        "narHash": "sha256-JVZl8NaVRYb0+381nl7LvPE+A774/dRpif01FKLrYFQ=",
+        "lastModified": 1762286042,
+        "narHash": "sha256-OD5HsZ+sN7VvNucbrjiCz7CHF5zf9gP51YVJvPwYIH8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "647e5c14cbd5067f44ac86b74f014962df460840",
+        "rev": "12c1f0253aa9a54fdf8ec8aecaafada64a111e24",
         "type": "github"
       },
       "original": {
diff --git a/lib/call-cabal-project-to-nix.nix b/lib/call-cabal-project-to-nix.nix
index 34dec9b988..2c65c5240f 100644
--- a/lib/call-cabal-project-to-nix.nix
+++ b/lib/call-cabal-project-to-nix.nix
@@ -89,7 +89,7 @@ let
       #
       # > The option `packages.Win32.package.identifier.name' is used but not defined.
       #
-      (compilerSelection pkgs)."${compiler-nix-name}";
+      (compilerSelection pkgs.buildPackages)."${compiler-nix-name}";
 
 in let
   ghc = if ghc' ? latestVersion
diff --git a/overlays/bootstrap.nix b/overlays/bootstrap.nix
index 2da240b20f..ba124fb5be 100644
--- a/overlays/bootstrap.nix
+++ b/overlays/bootstrap.nix
@@ -867,8 +867,9 @@ in {
 
                 bootPkgs = bootPkgsGhc94 // {
                   ghc = if final.stdenv.buildPlatform != final.stdenv.targetPlatform
-                    then final.buildPackages.buildPackages.haskell-nix.compiler.ghc966
-                    else final.buildPackages.buildPackages.haskell.compiler.ghc966
+                    then final.buildPackages.buildPackages.haskell-nix.compiler.ghc967
+                    else final.buildPackages.buildPackages.haskell.compiler.ghc967
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
                           or final.buildPackages.buildPackages.haskell.compiler.ghc963
@@ -893,8 +894,9 @@ in {
 
                 bootPkgs = bootPkgsGhc94 // {
                   ghc = if final.stdenv.buildPlatform != final.stdenv.targetPlatform
-                    then final.buildPackages.buildPackages.haskell-nix.compiler.ghc966
-                    else final.buildPackages.buildPackages.haskell.compiler.ghc966
+                    then final.buildPackages.buildPackages.haskell-nix.compiler.ghc967
+                    else final.buildPackages.buildPackages.haskell.compiler.ghc967
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
                           or final.buildPackages.buildPackages.haskell.compiler.ghc963
@@ -920,7 +922,8 @@ in {
                 bootPkgs = bootPkgsGhc94 // {
                   ghc = if final.stdenv.buildPlatform != final.stdenv.targetPlatform
                     then final.buildPackages.buildPackages.haskell-nix.compiler.ghc983
-                    else final.buildPackages.buildPackages.haskell.compiler.ghc966
+                    else final.buildPackages.buildPackages.haskell.compiler.ghc967
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
                           or final.buildPackages.buildPackages.haskell.compiler.ghc963
@@ -946,7 +949,8 @@ in {
                 bootPkgs = bootPkgsGhc94 // {
                   ghc = if final.stdenv.buildPlatform != final.stdenv.targetPlatform
                     then final.buildPackages.buildPackages.haskell-nix.compiler.ghc984
-                    else final.buildPackages.buildPackages.haskell.compiler.ghc966
+                    else final.buildPackages.buildPackages.haskell.compiler.ghc967
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
                           or final.buildPackages.buildPackages.haskell.compiler.ghc963
@@ -977,6 +981,7 @@ in {
                          # or final.buildPackages.buildPackages.haskell.compiler.ghc983
                              final.buildPackages.buildPackages.haskell.compiler.ghc982
                           or final.buildPackages.buildPackages.haskell.compiler.ghc981
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc967
                           or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
@@ -1008,6 +1013,7 @@ in {
                          # or final.buildPackages.buildPackages.haskell.compiler.ghc983
                              final.buildPackages.buildPackages.haskell.compiler.ghc982
                           or final.buildPackages.buildPackages.haskell.compiler.ghc981
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc967
                           or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
@@ -1040,6 +1046,7 @@ in {
                           or final.buildPackages.buildPackages.haskell.compiler.ghc983
                           or final.buildPackages.buildPackages.haskell.compiler.ghc982
                           or final.buildPackages.buildPackages.haskell.compiler.ghc981
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc967
                           or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
@@ -1073,6 +1080,7 @@ in {
                           or final.buildPackages.buildPackages.haskell.compiler.ghc983
                           or final.buildPackages.buildPackages.haskell.compiler.ghc982
                           or final.buildPackages.buildPackages.haskell.compiler.ghc981
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc967
                           or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
@@ -1114,6 +1122,7 @@ in {
                           or final.buildPackages.buildPackages.haskell.compiler.ghc983
                           or final.buildPackages.buildPackages.haskell.compiler.ghc982
                           or final.buildPackages.buildPackages.haskell.compiler.ghc981
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc967
                           or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
@@ -1138,8 +1147,9 @@ in {
             } // final.lib.optionalAttrs (builtins.compareVersions version "9.7" <0) {
                 bootPkgs = bootPkgsGhc94 // {
                   ghc = if final.stdenv.buildPlatform != final.stdenv.targetPlatform
-                    then final.buildPackages.buildPackages.haskell-nix.compiler.ghc966
-                    else final.buildPackages.buildPackages.haskell.compiler.ghc966
+                    then final.buildPackages.buildPackages.haskell-nix.compiler.ghc967
+                    else final.buildPackages.buildPackages.haskell.compiler.ghc967
+                          or final.buildPackages.buildPackages.haskell.compiler.ghc966
                           or final.buildPackages.buildPackages.haskell.compiler.ghc965
                           or final.buildPackages.buildPackages.haskell.compiler.ghc964
                           or final.buildPackages.buildPackages.haskell.compiler.ghc963