diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8ac0dea..1035cef 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        rust: [nightly]
+        rust: [nightly-2019-09-03]
 
     steps:
     - uses: hecrj/setup-rust-action@master