diff --git a/kokoro/docs/publish-python.sh b/kokoro/docs/publish-python.sh
index 3ccd7b63d9..1314598af1 100755
--- a/kokoro/docs/publish-python.sh
+++ b/kokoro/docs/publish-python.sh
@@ -14,7 +14,7 @@ sudo apt-get -y install software-properties-common
 sudo add-apt-repository universe
 sudo apt-get update
 sudo apt-get -y install unzip
-wget https://github.com/protocolbuffers/protobuf/releases/download/v3.15.8/protoc-3.15.8-linux-x86_64.zip
+wget https://github.com/protocolbuffers/protobuf/releases/download/v21.0-rc1/protoc-21.0-rc-1-linux-x86_64.zip
 unzip protoc-21.0-rc-1-linux-x86_64.zip bin/protoc
 mv bin/protoc ../src/protoc
 python3 -m venv venv