diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index b31886999..8d35976de 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
-        rust: [ stable, nightly ]
+        rust: [ stable, nightly-2021-07-05 ]
 
     steps:
       - uses: actions/checkout@v2