diff --git a/hacking/nix/rust-utils/build-sysroot.nix b/hacking/nix/rust-utils/build-sysroot.nix
index 8f7d1e589..e1ac6e0d4 100644
--- a/hacking/nix/rust-utils/build-sysroot.nix
+++ b/hacking/nix/rust-utils/build-sysroot.nix
@@ -36,7 +36,9 @@ let
 
   manifest = crateUtils.toTOMLFile "Cargo.toml" (crateUtils.clobber [
     {
-      inherit package;
+      package = package // {
+        edition = "2021";
+      };
       lib.path = crateUtils.dummyLibWithoutStdInSrc;
     }
     extraManifest