diff --git a/src/copier_templates_extensions/_internal/context.py b/src/copier_templates_extensions/_internal/context.py
index 8fb8333..c9d84be 100644
--- a/src/copier_templates_extensions/_internal/context.py
+++ b/src/copier_templates_extensions/_internal/context.py
@@ -59,7 +59,7 @@ def __init__(
 
         environment.context_class = ContextClass
 
-    def hook(self, context: dict) -> dict:
+    def hook(self, context: dict[str, Any]) -> dict[str, Any] | None:
         """Abstract hook. Does nothing.
 
         Override this method to either return