diff --git a/mk-poetry-dep.nix b/mk-poetry-dep.nix
index 867f6d985..147159e74 100644
--- a/mk-poetry-dep.nix
+++ b/mk-poetry-dep.nix
@@ -163,11 +163,13 @@ pythonPackages.callPackage
       src =
         if isGit then
           (
-            builtins.fetchGit {
+            builtins.fetchGit ({
               inherit (source) url;
               rev = source.resolved_reference or source.reference;
               ref = sourceSpec.branch or sourceSpec.rev or (if sourceSpec?tag then "refs/tags/${sourceSpec.tag}" else "HEAD");
-            }
+            } // (lib.optionalAttrs (builtins.compareVersions builtins.nixVersion "2.3" >  0) {
+              allRefs = true;
+            }))
           )
         else if isUrl then
           builtins.fetchTarball