diff --git a/.travis.yml b/.travis.yml
index 72be880..97ca3b1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: crystal
+before_install: apt-key adv --keyserver keys.gnupg.net --recv-keys A4EBAC6667697DD2
 crystal:
   - latest
 deploy: