diff --git a/.github/workflows/build-all-versions.yml b/.github/workflows/build-all-versions.yml
index 52db74850..df71f0ac0 100644
--- a/.github/workflows/build-all-versions.yml
+++ b/.github/workflows/build-all-versions.yml
@@ -13,16 +13,16 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macOS-latest, windows-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         cabal: ["3.2"]
         ghc:
           - "8.6.5"
           - "8.8.3"
           - "8.10.1"
         exclude:
-          - os: macOS-latest
+          - os: macos-latest
             ghc: 8.8.3
-          - os: macOS-latest
+          - os: macos-latest
             ghc: 8.6.5
           - os: windows-latest
             ghc: 8.8.3
@@ -92,4 +92,4 @@ jobs:
 
     # - name: Test
     #   run: |
-    #     stack test --system-ghc
\ No newline at end of file
+    #     stack test --system-ghc
diff --git a/.github/workflows/build-macos-package.yml b/.github/workflows/build-macos-package.yml
index c01227791..e3ed3def2 100644
--- a/.github/workflows/build-macos-package.yml
+++ b/.github/workflows/build-macos-package.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macOS-latest]
+        os: [macos-10.15]
         ghc: ["8.6.5"]
         cabal: ["2.4"]
 
@@ -27,7 +27,8 @@ jobs:
     - name: Install build tools
       run: |
         brew install \
-          automake
+          automake \
+          openjdk
         cabal v1-install alex happy
 
     - name: Build macOS package
diff --git a/.github/workflows/build-python-package.yml b/.github/workflows/build-python-package.yml
index 921da9fb5..fef31a785 100644
--- a/.github/workflows/build-python-package.yml
+++ b/.github/workflows/build-python-package.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os: [ubuntu-18.04, macos-latest]
+        os: [ubuntu-18.04, macos-10.15]
 
     steps:
     - uses: actions/checkout@v1