diff --git a/.travis.yml b/.travis.yml
index 7b28180ff..fe71e1600 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -53,6 +53,7 @@ addons:
     - python3-mock
     - python3-pyicu
     - python3-coverage
+    - python3-jsonschema
     # lxml dependencies.  for merge_ref_test to work
     # - libxml2-dev
     # - libxslt1-dev