diff --git a/flake.nix b/flake.nix
index 33cb1c3b65762b..a3d5b283c8f6d1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -47,7 +47,7 @@
             lastModifiedDate = self.lastModifiedDate;
           };
           packages.hhvm_clang = packages.hhvm.override {
-            stdenv = pkgs.llvmPackages_12.libcxxStdenv;
+            stdenv = pkgs.llvmPackages_14.stdenv;
           };
           packages.default = packages.hhvm;