diff --git a/.travis.yml b/.travis.yml
index 33f2db9..41dadfd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,8 +33,9 @@ jobs:
       rust: stable
       # <1.24 doesn't work because of lazy-static 1.2.0
       # <1.26.2 doesn't work because of nom 4.1.1
+      # <1.31.1 doesn't work because of rename-dependency
     - <<: *check # also test oldest known-good stable
-      rust: 1.26.2
+      rust: 1.31.1
     - stage: test
       rust: stable
       os: osx