diff --git a/vllm/pooling_params.py b/vllm/pooling_params.py
index 5c3dfa8ac9cbc..d1aab98c274e1 100644
--- a/vllm/pooling_params.py
+++ b/vllm/pooling_params.py
@@ -57,7 +57,7 @@ class PoolingParams(
     ## Internal use only
     task: PoolingTask | None = None
     requires_token_ids: bool = False
-    skip_reading_prefix_cache: bool = None
+    skip_reading_prefix_cache: bool | None = None
     extra_kwargs: dict[str, Any] | None = None
     output_kind: RequestOutputKind = RequestOutputKind.FINAL_ONLY
 
diff --git a/vllm/sampling_params.py b/vllm/sampling_params.py
index 142853ff0ff0e..8de961e62db1b 100644
--- a/vllm/sampling_params.py
+++ b/vllm/sampling_params.py
@@ -238,7 +238,7 @@ class SamplingParams(
     generated token can complete the sequence."""
     _bad_words_token_ids: list[list[int]] | None = None
 
-    skip_reading_prefix_cache: bool = None
+    skip_reading_prefix_cache: bool | None = None
 
     @staticmethod
     def from_optional(