diff --git a/.github/workflows/install.yml b/.github/workflows/install.yml
index 1c76344..10ef035 100644
--- a/.github/workflows/install.yml
+++ b/.github/workflows/install.yml
@@ -23,7 +23,7 @@ jobs:
       run: cmake -Htest -Bbuild -DTEST_INSTALLED_VERSION=1
 
     - name: build
-      run: cmake --build build --config Debug
+      run: cmake --build build --config Debug -j4
 
     - name: test
       run: |
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 2399869..2a25d07 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -14,10 +14,10 @@ jobs:
     - uses: actions/checkout@v1
     
     - name: configure
-      run: cmake -Htest -Bbuild -GNinja
+      run: cmake -Htest -Bbuild
 
     - name: build
-      run: cmake --build build --config Debug
+      run: cmake --build build --config Debug -j4
 
     - name: test
       run: |
diff --git a/.github/workflows/standalone.yml b/.github/workflows/standalone.yml
index 97e2991..5e0c02c 100644
--- a/.github/workflows/standalone.yml
+++ b/.github/workflows/standalone.yml
@@ -11,10 +11,10 @@ jobs:
     - uses: actions/checkout@v1
     
     - name: configure
-      run: cmake -Hstandalone -Bbuild -GNinja
+      run: cmake -Hstandalone -Bbuild
 
     - name: build
-      run: cmake --build build
+      run: cmake --build build -j4
 
     - name: run
       run: ./build/Greeter
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 5f37bcc..8b64f5e 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -15,10 +15,10 @@ jobs:
     - uses: actions/checkout@v1
     
     - name: configure
-      run: cmake -Htest -Bbuild -DENABLE_TEST_COVERAGE=1 -GNinja
+      run: cmake -Htest -Bbuild -DENABLE_TEST_COVERAGE=1
 
     - name: build
-      run: cmake --build build --config Debug
+      run: cmake --build build --config Debug -j4
 
     - name: test
       run: |