diff --git a/.travis.yml b/.travis.yml
index 31a7398..ce88bd6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,10 @@ rust:
     - "1.46.0"
     - "1.47.0"
     - "1.48.0"
+    - "1.49.0"
+    - "1.50.0"
+    - "1.51.0"
+    - "1.52.1"
     - "stable"
     - "beta"
     - "nightly"