diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 6eb4298f..4438d3f2 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -7,7 +7,7 @@ jobs:
   unix-testing:
     strategy:
       matrix:
-        os: [ubuntu-20.04, ubuntu-18.04, ubuntu-16.04, macos-10.15]
+        os: [ubuntu-20.04, ubuntu-18.04, macos-10.15]
         cc: [gcc, clang]
         buildsys: [make, cmake]
         include: