diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 78f845c5e3..72795cdd0a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,12 +6,12 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[ci skip]')"
     strategy:
       matrix:
-        os: [ubuntu-18.04, windows-2019, macOS-10.15]
+        os: [ubuntu-20.04, windows-2019, macOS-11]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v1
     - name: Install dependencies (Ubuntu)
-      if: matrix.os == 'ubuntu-18.04'
+      if: matrix.os == 'ubuntu-20.04'
       run: |
         sudo apt-get update
         sudo apt-get install build-essential bison flex libfreetype6-dev libgl1-mesa-dev libjpeg-dev libode-dev libopenal-dev libpng-dev libssl-dev libvorbis-dev libx11-dev libxcursor-dev libxrandr-dev nvidia-cg-toolkit zlib1g-dev