diff --git a/.github/workflows/autobuild.yaml b/.github/workflows/autobuild.yaml
index a1089f0..eb30e6c 100644
--- a/.github/workflows/autobuild.yaml
+++ b/.github/workflows/autobuild.yaml
@@ -170,7 +170,7 @@ jobs:
           grpc_cmake: >-
             "-DOPENSSL_NO_ASM=ON"
         - name: linux
-          os: ubuntu-18.04
+          os: ubuntu-20.04
           preinstall: sudo apt-get update && sudo apt-get install ninja-build libz-dev libc-ares-dev
           cflags: -O3 -gline-tables-only -DNDEBUG -include $GITHUB_WORKSPACE/.github/workflows/lib_compat.h
           cmake: >-