diff --git a/.travis.yml b/.travis.yml
index 2a7a7c3..ca585bb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ env:
 - ARGS=""
 - ARGS="--resolver lts-2"
 - ARGS="--resolver lts-3"
+- ARGS="--resolver lts-4"
 - ARGS="--resolver lts"
 - ARGS="--resolver nightly"