diff --git a/.github/workflows/documentation.yaml b/.github/workflows/documentation.yaml
index 3ee6d30..767bbce 100644
--- a/.github/workflows/documentation.yaml
+++ b/.github/workflows/documentation.yaml
@@ -12,6 +12,11 @@ jobs:
     steps:
       - uses: actions/checkout@v1
 
+      - uses: actions/cache@v2
+        with:
+          path: '**/cpm_modules'
+          key: cpm-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
+
       - name: Install dependencies
         run: |
           brew install doxygen
@@ -19,7 +24,7 @@ jobs:
 
       - name: Build
         run: |
-          cmake -Hdocumentation -Bbuild
+          cmake -Sdocumentation -Bbuild -DCPM_SOURCE_CACHE=$(pwd)/cpm_modules
           cmake --build build --target GenerateDocs
 
       - name: Publish
diff --git a/.github/workflows/install.yml b/.github/workflows/install.yml
index 997da70..bc9a3ad 100644
--- a/.github/workflows/install.yml
+++ b/.github/workflows/install.yml
@@ -17,21 +17,26 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: build and install library
-      run: |
-        cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Release
-        sudo cmake --build build --target install
-        rm -rf build
+      - uses: actions/checkout@v1
 
-    - name: configure
-      run: cmake -Htest -Bbuild -DTEST_INSTALLED_VERSION=1
+      - uses: actions/cache@v2
+        with:
+          path: '**/cpm_modules'
+          key: cpm-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: build
-      run: cmake --build build --config Debug -j4
+      - name: build and install library
+        run: |
+          cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Release
+          sudo cmake --build build --target install
+          rm -rf build
 
-    - name: test
-      run: |
-        cd build
-        ctest --build-config Debug
+      - name: configure
+        run: cmake -Stest -Bbuild -DCPM_SOURCE_CACHE=$(pwd)/cpm_modules -DTEST_INSTALLED_VERSION=1
+
+      - name: build
+        run: cmake --build build --config Debug -j4
+
+      - name: test
+        run: |
+          cd build
+          ctest --build-config Debug
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 2fcbe9c..bc2295a 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -13,19 +13,24 @@ env:
 
 jobs:
   build:
-
+  
     runs-on: macos-latest
     
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Htest -Bbuild -DCMAKE_BUILD_TYPE=Debug
+      - uses: actions/checkout@v1
+      
+      - uses: actions/cache@v2
+        with:
+          path: '**/cpm_modules'
+          key: cpm-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: build
-      run: cmake --build build -j4
+      - name: configure
+        run: cmake -Stest -Bbuild -DCPM_SOURCE_CACHE=$(pwd)/cpm_modules -DCMAKE_BUILD_TYPE=Debug
 
-    - name: test
-      run: |
-        cd build
-        ctest --build-config Debug
+      - name: build
+        run: cmake --build build -j4
+
+      - name: test
+        run: |
+          cd build
+          ctest --build-config Debug
diff --git a/.github/workflows/standalone.yml b/.github/workflows/standalone.yml
index 7fe2767..5b2aba3 100644
--- a/.github/workflows/standalone.yml
+++ b/.github/workflows/standalone.yml
@@ -14,13 +14,18 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Hstandalone -Bbuild -DCMAKE_BUILD_TYPE=Debug
+      - uses: actions/checkout@v1
+      
+      - uses: actions/cache@v2
+        with:
+          path: '**/cpm_modules'
+          key: cpm-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: build
-      run: cmake --build build -j4
+      - name: configure
+        run: cmake -Sstandalone -Bbuild -DCMAKE_BUILD_TYPE=Debug -DCMAKE_BUILD_TYPE=Debug
 
-    - name: run
-      run: ./build/Greeter
+      - name: build
+        run: cmake --build build -j4
+
+      - name: run
+        run: ./build/Greeter
diff --git a/.github/workflows/style.yml b/.github/workflows/style.yml
index 48d1fa5..03b13f2 100644
--- a/.github/workflows/style.yml
+++ b/.github/workflows/style.yml
@@ -14,15 +14,20 @@ jobs:
     runs-on: macos-latest
     
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: Install format dependencies
-      run: |
-        brew install clang-format
-        pip3 install cmake_format==0.6.11 pyyaml
+      - uses: actions/checkout@v1
+      
+      - uses: actions/cache@v2
+        with:
+          path: '**/cpm_modules'
+          key: cpm-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: configure
-      run: cmake -Htest -Bbuild
+      - name: Install format dependencies
+        run: |
+          brew install clang-format
+          pip3 install cmake_format==0.6.11 pyyaml
 
-    - name: check style
-      run: cmake --build build --target check-format
+      - name: configure
+        run: cmake -Stest -Bbuild -DCPM_SOURCE_CACHE=$(pwd)/cpm_modules
+
+      - name: check style
+        run: cmake --build build --target check-format
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 29d1509..11c3d12 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -18,18 +18,23 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Htest -Bbuild -DENABLE_TEST_COVERAGE=1 -DCMAKE_BUILD_TYPE=Debug
+      - uses: actions/checkout@v1
 
-    - name: build
-      run: cmake --build build -j4
+      - uses: actions/cache@v2
+        with:
+          path: '**/cpm_modules'
+          key: cpm-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: test
-      run: |
-        cd build
-        ctest --build-config Debug
+      - name: configure
+        run: cmake -Stest -Bbuild -DCPM_SOURCE_CACHE=$(pwd)/cpm_modules -DENABLE_TEST_COVERAGE=1 -DCMAKE_BUILD_TYPE=Debug
 
-    - name: collect code coverage
-      run: bash <(curl -s https://codecov.io/bash) || echo "Codecov did not collect coverage reports"
+      - name: build
+        run: cmake --build build -j4
+
+      - name: test
+        run: |
+          cd build
+          ctest --build-config Debug
+
+      - name: collect code coverage
+        run: bash <(curl -s https://codecov.io/bash) || echo "Codecov did not collect coverage reports"
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 8f6d2b2..c5eb662 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -17,15 +17,20 @@ jobs:
     runs-on: windows-latest
     
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Htest -Bbuild
+      - uses: actions/checkout@v1
+      
+      - uses: actions/cache@v2
+        with:
+          path: '**/cpm_modules'
+          key: cpm-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: build
-      run: cmake --build build --config Debug -j4
+      - name: configure
+        run: cmake -Stest -Bbuild -DCPM_SOURCE_CACHE=$(pwd)/cpm_modules
 
-    - name: test
-      run: |
-        cd build
-        ctest --build-config Debug
+      - name: build
+        run: cmake --build build --config Debug -j4
+
+      - name: test
+        run: |
+          cd build
+          ctest --build-config Debug