diff --git a/.travis.yml b/.travis.yml
index dc3f978..753186e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,15 +7,10 @@ rust:
 
 env:
   - TEST_COMMAND=test FEATURES=''
+  - TEST_COMMAND=test FEATURES=--features="serde"
 
 matrix:
   include:
-    - rust: stable
-      env: TEST_COMMAND=test FEATURES=--features="serde"
-    - rust: beta
-      env: TEST_COMMAND=test FEATURES=--features="serde"
-    - rust: nightly
-      env: TEST_COMMAND=test FEATURES=--features="serde"
     - rust: nightly
       env: TEST_COMMAND=build FEATURES="--no-default-features --features=u32_backend"
     - rust: nightly