diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a5e33e2..ac9fbda 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,13 +29,6 @@ jobs:
             cxxflags: "cxxflags=--coverage -fsanitize=address,leak,undefined -fno-sanitize-recover=undefined"
             linkflags: "linkflags=--coverage -lasan -lubsan"
             gcov_tool: "gcov-10"
-          - toolset: clang
-            compiler: clang++-9
-            cxxstd: "03,11,14,17,2a"
-            os: ubuntu-20.04
-            cxxflags: "cxxflags=--coverage"
-            linkflags: "linkflags=--coverage"
-            gcov_tool: "llvm-cov-9 gcov"
           - toolset: clang
             compiler: clang++-10
             cxxstd: "03,11,14,17,2a"