diff --git a/.travis.yml b/.travis.yml
index 56157b6a..379a03a5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,5 +3,6 @@ python:
         - "3.6.4"
 # install dependencies
 install:
+        - apt install gpg
         - pip install -r requirements.txt
 script: ./test.sh