diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3814a5d37..3560af4b9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,18 +1,18 @@
 image: debian:stretch-slim
 
 build_ubuntu_18_04:
   stage: build
   image: ubuntu:bionic
   #only:
   #  - merge_requests
   before_script:
     - sed -i -e 's/# deb-src/deb-src/g' /etc/apt/sources.list
     - apt-get update
     - apt-get build-dep --yes --no-install-recommends umbrello
-    - apt-get install --yes --no-install-recommends ninja-build libkf5crash-dev curl
+    - apt-get install --yes --no-install-recommends ninja-build libkf5crash-dev curl ca-certificates
   script:
     # trigger windows build
     - 'curl -H "Authorization: Token pZJ6BUtc7egASLS4VG7D17GW" -X POST https://api.opensuse.org/trigger/runservice'
     - mkdir -p build && cd build
     - cmake -G Ninja ..
     - ninja