diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 046a8f650429edaef7615b7362723693ca2e5c7c..32c7a2c098a66589ecbd8bdd41aa08d43dfa6c8a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,7 +21,7 @@ before_script:
   - export SITE_PACKAGES=`pwd`/site_packages && mkdir -pv $SITE_PACKAGES
   - export PYTHONPATH=$PYTHONPATH:$SITE_PACKAGES
   - apt-get update -yq && apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y cmake libfftw3-dev
-  - apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y liblapack-dev python3.6 python3.6-dev python3-pip
+  - apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y liblapack-dev python3.5 python3.5-dev python3-pip
   - pip3 install --target=$SITE_PACKAGES scipy matplotlib nose coverage
 
 # Main build