diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5fb7473dd..f974fbecc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -261,6 +261,7 @@ jobs:
         submodules: true
     - name: Bootstrap
       run: |
+        brew update
         brew install automake m4 ninja
         [ ${{ matrix.CC }} != clang ] || brew install llvm
     - name: Build
diff --git a/.github/workflows/posix.yml b/.github/workflows/posix.yml
index 5f91bc3d1..4dcfe91a1 100644
--- a/.github/workflows/posix.yml
+++ b/.github/workflows/posix.yml
@@ -52,6 +52,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Bootstrap
       run: |
+        brew update
         brew install ninja
     - name: Run RCP Mode
       run: |
@@ -296,6 +297,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Bootstrap
       run: |
+        brew update
         brew install ninja socat
     - name: Build
       run: |