diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 35a315f..e60444e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,13 +11,8 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-2019, ubuntu-latest, windows-latest]
+        os: [ubuntu-latest, windows-latest]
         include:
-          - os: ubuntu-20.04
-            cc: clang-10
-            cxx: clang++-10
-          - os: windows-2019
-            cc: msvc
           - os: ubuntu-latest
             cc: clang
             cxx: clang++