diff --git a/google/cloud/pubsublite/internal/b64_utils.py b/google/cloud/pubsublite/internal/b64_utils.py
deleted file mode 100644
index 1a5dd15c..00000000
--- a/google/cloud/pubsublite/internal/b64_utils.py
+++ /dev/null
@@ -1,11 +0,0 @@
-import base64
-import pickle
-
-
-def to_b64_string(src: object) -> str:
-  return base64.b64encode(pickle.dumps(src)).decode('utf-8')
-
-
-def from_b64_string(src: str) -> object:
-  return pickle.loads(base64.b64decode(src.encode('utf-8')))
-