diff --git a/src/rapids_pre_commit_hooks/alpha_spec.py b/src/rapids_pre_commit_hooks/alpha_spec.py
index 9d1e7d0..dd3d982 100644
--- a/src/rapids_pre_commit_hooks/alpha_spec.py
+++ b/src/rapids_pre_commit_hooks/alpha_spec.py
@@ -270,7 +270,7 @@ def __init__(self, stream) -> None:
         super().__init__(stream)
         self.document_anchors: list[dict[str, yaml.Node]] = []
 
-    def compose_document(self) -> yaml.Node:
+    def compose_document(self) -> "yaml.Node":
         # Drop the DOCUMENT-START event.
         self.get_event()
 
diff --git a/src/rapids_pre_commit_hooks/copyright.py b/src/rapids_pre_commit_hooks/copyright.py
index e282869..9c46ad4 100644
--- a/src/rapids_pre_commit_hooks/copyright.py
+++ b/src/rapids_pre_commit_hooks/copyright.py
@@ -202,7 +202,7 @@ def get_target_branch_upstream_commit(
                 key=lambda commit: commit.committed_datetime,
             )
 
-    def try_get_ref(remote: git.Remote) -> Optional[git.Reference]:
+    def try_get_ref(remote: "git.Remote") -> Optional["git.Reference"]:
         try:
             return remote.refs[target_branch_name]
         except IndexError:
@@ -242,7 +242,7 @@ def get_changed_files(
             for filename in filenames
         }
 
-    changed_files: dict[Union[str, os.PathLike[str]], Optional[git.Blob]] = {
+    changed_files: dict[Union[str, os.PathLike[str]], Optional["git.Blob"]] = {
         f: None for f in repo.untracked_files
     }
     target_branch_upstream_commit = get_target_branch_upstream_commit(repo, args)