diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 987b0005..bf001666 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04]
+        os: [ubuntu-18.04, ubuntu-20.04]
         build_type: [Release, Debug]
         compiler: [{
           "cc": "gcc",