diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 3f634ac..55461db 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-16.04, windows-latest, macOS-latest]
 
     steps:
       - uses: actions/checkout@v1