diff --git a/java/requirements.txt b/java/requirements.txt
index 5cf1708..d8e69d5 100644
--- a/java/requirements.txt
+++ b/java/requirements.txt
@@ -1,3 +1,3 @@
 mypy-protobuf==1.12
-protobuf==3.9.0
+protobuf==3.15.0
 six==1.12.0