diff --git a/.github/workflows/flutter-nightly.yml b/.github/workflows/flutter-nightly.yml
index 6a6fae7bc..5e677c4db 100644
--- a/.github/workflows/flutter-nightly.yml
+++ b/.github/workflows/flutter-nightly.yml
@@ -91,7 +91,7 @@ jobs:
           # - { target: i686-unknown-linux-gnu      , os: ubuntu-20.04, use-cross: true }
           # - { target: i686-unknown-linux-musl     , os: ubuntu-20.04, use-cross: true }
           # - { target: x86_64-apple-darwin         , os: macos-10.15                   }
-          - { target: x86_64-unknown-linux-gnu    , os: ubuntu-20.04 }
+          - { target: x86_64-unknown-linux-gnu    , os: ubuntu-18.04 }
           # - { target: x86_64-unknown-linux-musl   , os: ubuntu-20.04, use-cross: true }
     steps:
       - name: Checkout source code