diff --git a/.travis.yml b/.travis.yml
index c39f61c..2d871ed 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,11 @@ compiler: g++
 
 addons:
   apt:
+    update: true
     sources:
       - george-edison55-precise-backports
       - ubuntu-toolchain-r-test
-      - timsc
+      - sourceline: 'ppa:timsc/opencv-3.4'
     packages:
       - cmake-data
       - cmake