diff --git a/.drone.yml b/.drone.yml
index 47edf59..e89959e 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -30,7 +30,11 @@ steps:
   commands:
   - rm /etc/apt/apt.conf.d/docker-clean
   - apt-get update -q
-  - apt-get install -qq g++-6 clang-7 cmake pkg-config
+  - echo "APT::Default-Release \"stretch\";" >> /etc/apt/apt.conf.d/00default_release
+  - echo "deb http://deb.debian.org/debian stretch-backports main" >> /etc/apt/sources.list.d/stretch.list
+  - apt-get update -q
+  - apt-get install -qq -t stretch-backports cmake
+  - apt-get install -qq g++-6 clang-7 pkg-config
   - apt-get install -qq libcrypto++-dev libmagick++-dev libxdg-basedir-dev
   - dpkg -i identiconpp_stretch.deb
   - rm -rf build && mkdir -p build && cd build