diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 70f8d1a2..3e0bde90 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -48,6 +48,7 @@ jobs:
           # Cargo.toml rust-version
           - { os: ubuntu-22.04,   rust-version: "1.85",  target: 'x86_64-unknown-linux-gnu'}
           # rust versions
+          - { os: ubuntu-22.04, rust-version: "1.77", target: 'x86_64-unknown-linux-gnu'} 
           - { os: ubuntu-22.04,   rust-version: beta,    target: 'x86_64-unknown-linux-gnu'}
           - { os: ubuntu-22.04,   rust-version: nightly, target: 'x86_64-unknown-linux-gnu', miri: true, components: "miri"} 
     defaults: