Disable testing against stable
diff --git a/.travis.yml b/.travis.yml
index ae444c8..6768c49 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: dart
 
 dart:
-  - 2.10.0-0
+  # TODO(#308): re-enable testing against stable after 2.10 release.
+  # - 2.10.0
   - dev
 
 dart_task: