diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e483ace01..4fa09ee98 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,16 +14,16 @@ on:
       - created
 jobs:
   build:
-    runs-on: macos-10.15
+    runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: Install dependencies
         run: |
            date -u
            mkdir build
            date +%s > build/stamp
            brew uninstall --ignore-dependencies libtiff
-           brew install libtiff gtk+3 gtkmm3 gtk-mac-integration adwaita-icon-theme libsigc++ little-cms2 libiptcdata fftw lensfun expat pkgconfig libomp shared-mime-info | tee -a depslog
+           brew install libtiff gtk+3 gtkmm3 gtk-mac-integration adwaita-icon-theme libsigc++@2 little-cms2 libiptcdata fftw lensfun expat pkgconfig libomp shared-mime-info | tee -a depslog
            date -u
            echo "----====Pourage====----"
            cat depslog | grep Pouring
@@ -82,11 +82,11 @@ jobs:
           echo "=== artifact: ${ARTIFACT}"
           # defining environment variables for next step as per
           # https://github.com/actions/starter-workflows/issues/68
-          echo "::set-env name=ARTIFACT_PATH::${GITHUB_WORKSPACE}/build/${ARTIFACT}"
-          echo "::set-env name=ARTIFACT_FILE::${ARTIFACT}"
+          echo "ARTIFACT_PATH=${GITHUB_WORKSPACE}/build/${ARTIFACT}" >> $GITHUB_ENV
+          echo "ARTIFACT_FILE=${ARTIFACT}" >> $GITHUB_ENV
           zsh -c 'echo "Bundled in $(printf "%0.2f" $(($[$(date +%s)-$(cat bundlestamp)]/$((60.))))) minutes"'
           exit
-      - uses: actions/upload-artifact@v1
+      - uses: actions/upload-artifact@v2
         with:
           name: ${{env.ARTIFACT_FILE}}
           path: ${{env.ARTIFACT_PATH}}