diff --git a/flake.nix b/flake.nix
index 6bec9b29a6d..dbecdfb10f9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -49,6 +49,9 @@
             llvmPackages_15.llvm
             libxml2
             libffi
+
+            # Test runner
+            cargo-nextest
           ];
           runtimeDependencies = with pkgs; [ ];