diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 08b1243..161ea48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
           - nightly
         include:
           - rust: 1.45.0          
-            test_features: "--all-features"
+            test_features: "--features impl_json_schema"
             allow_failure: false
           - rust: stable
             test_features: "--all-features"