diff --git a/.travis.yml b/.travis.yml
index ef2dfef..491e777 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,9 +6,9 @@ python:
   - "3.5"
   - "3.6"
 before_script:
-  - wget https://github.com/google/protobuf/releases/download/v3.3.0/protoc-3.3.0-linux-x86_64.zip -O /tmp/protoc.tar.gz
-  - unzip -o /tmp/protoc.tar.gz -d protoc-3.3.0
-  - export PATH=$PATH:$PWD/protoc-3.3.0/bin
+  - wget https://github.com/google/protobuf/releases/download/v3.6.1/protoc-3.6.1-linux-x86_64.zip -O /tmp/protoc.tar.gz
+  - unzip -o /tmp/protoc.tar.gz -d protoc-3.6.1
+  - export PATH=$PATH:$PWD/protoc-3.6.1/bin
   - git clone https://github.com/googleapis/googleapis.git
 install: pip install codecov tox-travis
 script: tox test/test_plugin_baseline.py