diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 56f5f3d..39b5b47 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,6 +18,7 @@ jobs:
     strategy:
       matrix:
         rust:
+          - 1.56
           - stable
           - nightly
         os: