diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3b70f427d74ca86cde1735ea2556f8ca73f1ab87..9b9fefe1ab1547abf4598d2f7bf404df7f37b0ec 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,8 +1,6 @@
 before_script:
-    - echo "deb http://ftp.us.debian.org/debian unstable main contrib non-free" >> /etc/apt/sources.list.d/unstable.list
     - apt-get update
-    - apt-get install -y -qq make cmake libboost-test-dev gem
-    - apt-get install g++-5
+    - apt-get install -y -qq make cmake libboost-test-dev gem g++-7
     - gem install funit
     - ./build.sh