diff --git a/.travis.yml b/.travis.yml
index 1e6f82b5..4263a323 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ python:
   - "3.6"
 
 before_script:
-  - if [[ $TRAVIS_PYTHON_VERSION == '3.4'* ]]; then sudo apt-get -y install python3-pyqt5 python3-numpy python3-psutil; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == '3.4'* ]]; then sudo apt-get update && sudo apt-get -y install python3-pyqt5 python3-numpy python3-psutil; fi
   - sudo apt-get install -qq libegl1-mesa
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start