diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 503267f..093cf39 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        rust: [stable, beta, nightly]
+        rust: [1.66.0, stable, beta, nightly]
 
     steps:
     - uses: actions/checkout@v3