diff --git a/.travis.yml b/.travis.yml
index 1ce50ed..11d53f0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,10 @@
 language: python
 
+addons:
+  apt:
+    packages:
+      - libsodium-dev
+
 matrix:
   include:
     - python: 3.6