diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e93909a2610296d5707513597f766893dafdf5aa..d7bf375c07517cdf7842a8642a2b9707954702f2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -49,7 +49,7 @@ test-py3.7:
   script:
   - apt-get update -qy
   - apt-get install -y python3-pip wget zlib1g-dev
-  - apt-get install libssl-dev openssl
+  - apt-get install libssl-dev openssl libffi-dev
   - wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz
   - tar xzvf Python-3.7.0.tgz
   - cd Python-3.7.0