diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index ee9693f..76d6beb 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -2,7 +2,7 @@ name: ci
 on: push
 jobs:
   build-OSX:
-    runs-on: macos-10.15
+    runs-on: macos-11
     env:
       LDFLAGS: -L/usr/local/opt/qt@5/lib
       CPPFLAGS: -I/usr/local/opt/qt@5/include
@@ -26,6 +26,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
+      - run: sudo apt-get update
       - run: sudo apt-get install -y build-essential
       - run: sudo apt-get install -y ninja-build
       - run: make -f Makefile.linux clean