diff --git a/modules/dream2nix/WIP-python-pdm/default.nix b/modules/dream2nix/WIP-python-pdm/default.nix
index 269c2aa7cc..b434d04687 100644
--- a/modules/dream2nix/WIP-python-pdm/default.nix
+++ b/modules/dream2nix/WIP-python-pdm/default.nix
@@ -75,6 +75,7 @@ in {
       buildPackages
       curl
       jq
+      mkShell
       runCommand
       stdenvNoCC
       stdenv
@@ -100,6 +101,12 @@ in {
       # all packages attrs prefixed with version
       (lib.attrValues config.groups.default.packages);
   };
+  public.devShell = let
+    interpreter = config.deps.python.withPackages (ps: config.mkDerivation.propagatedBuildInputs);
+  in
+    config.deps.mkShell {
+      packages = [interpreter];
+    };
   groups = let
     groupNames = lib.attrNames groups_with_deps;
     populateGroup = groupname: let
@@ -131,7 +138,7 @@ in {
             (dream2nix.overrides.python.${name} or {})
           ];
           inherit name;
-          version = pkg.version;
+          version = lib.mkDefault pkg.version;
           buildPythonPackage = {
             format = lib.mkDefault (
               if lib.hasSuffix ".whl" source.file
diff --git a/modules/dream2nix/core/lock/default.nix b/modules/dream2nix/core/lock/default.nix
index 58b5d4bb89..9d4c128e67 100644
--- a/modules/dream2nix/core/lock/default.nix
+++ b/modules/dream2nix/core/lock/default.nix
@@ -27,7 +27,7 @@
 
     repo_path = Path(subprocess.run(
         ['${config.paths.findRoot}'],  # noqa: E501
-        check=True, text=True, capture_output=True
+        check=True, text=True, stdout=subprocess.PIPE
     ).stdout.strip())
     lock_path_rel = Path('${config.paths.package}/${config.paths.lockFile}')  # noqa: E501
     lock_path = repo_path / lock_path_rel.relative_to(lock_path_rel.anchor)