diff --git a/.cmake-format b/.cmake-format
index a52c7d6..8c355cf 100644
--- a/.cmake-format
+++ b/.cmake-format
@@ -48,6 +48,7 @@ parse:
       kwargs:
         NAME: 1
         VERSION: 1
+        NAMESPACE: 1
         INCLUDE_DIR: 1
         INCLUDE_DESTINATION: 1
         BINARY_DIR: 1
diff --git a/.github/workflows/documentation.yaml b/.github/workflows/documentation.yaml
index 3ee6d30..8b12266 100644
--- a/.github/workflows/documentation.yaml
+++ b/.github/workflows/documentation.yaml
@@ -3,14 +3,22 @@ name: Documentation
 on:
   push:
     tags:
-      - '*'
+      - "*"
+
+env:
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
 
 jobs:
   build:
     name: Build and publish documentation
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+
+      - uses: actions/cache@v2
+        with:
+          path: "**/cpm_modules"
+          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
       - name: Install dependencies
         run: |
@@ -19,7 +27,7 @@ jobs:
 
       - name: Build
         run: |
-          cmake -Hdocumentation -Bbuild
+          cmake -Sdocumentation -Bbuild
           cmake --build build --target GenerateDocs
 
       - name: Publish
diff --git a/.github/workflows/install.yml b/.github/workflows/install.yml
index 997da70..606dddd 100644
--- a/.github/workflows/install.yml
+++ b/.github/workflows/install.yml
@@ -10,28 +10,33 @@ on:
 
 env:
   CTEST_OUTPUT_ON_FAILURE: 1
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
 
 jobs:
   build:
-
     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@v2
 
-    - name: configure
-      run: cmake -Htest -Bbuild -DTEST_INSTALLED_VERSION=1
+      - uses: actions/cache@v2
+        with:
+          path: "**/cpm_modules"
+          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: build
-      run: cmake --build build --config Debug -j4
+      - name: build and install library
+        run: |
+          cmake -S. -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 -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 cc82132..a2a098f 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -10,22 +10,27 @@ on:
 
 env:
   CTEST_OUTPUT_ON_FAILURE: 1
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
 
 jobs:
   build:
-
     runs-on: macos-latest
-    
+
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Htest -Bbuild
+      - uses: actions/checkout@v2
 
-    - name: build
-      run: cmake --build build --config Debug -j4
+      - uses: actions/cache@v2
+        with:
+          path: "**/cpm_modules"
+          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: test
-      run: |
-        cd build
-        ctest --build-config Debug
+      - name: configure
+        run: cmake -Stest -Bbuild -DCMAKE_BUILD_TYPE=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 85afe23..5c3853e 100644
--- a/.github/workflows/standalone.yml
+++ b/.github/workflows/standalone.yml
@@ -8,19 +8,26 @@ on:
     branches:
       - master
 
+env:
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
+
 jobs:
   build:
-
     runs-on: ubuntu-latest
-    
+
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Hstandalone -Bbuild
+      - uses: actions/checkout@v2
 
-    - name: build
-      run: cmake --build build -j4
+      - uses: actions/cache@v2
+        with:
+          path: "**/cpm_modules"
+          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: run
-      run: ./build/Greeter
+      - name: configure
+        run: cmake -Sstandalone -Bbuild -DCMAKE_BUILD_TYPE=Debug -DCMAKE_BUILD_TYPE=Debug
+
+      - 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..ba20a70 100644
--- a/.github/workflows/style.yml
+++ b/.github/workflows/style.yml
@@ -8,21 +8,28 @@ on:
     branches:
       - master
 
+env:
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
+
 jobs:
   build:
-
     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@v2
 
-    - name: configure
-      run: cmake -Htest -Bbuild
+      - uses: actions/cache@v2
+        with:
+          path: "**/cpm_modules"
+          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: check style
-      run: cmake --build build --target check-format
+      - name: Install format dependencies
+        run: |
+          brew install clang-format
+          pip3 install cmake_format==0.6.11 pyyaml
+
+      - name: configure
+        run: cmake -Stest -Bbuild
+
+      - name: check style
+        run: cmake --build build --target check-format
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index dd62cc8..a36711d 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -11,25 +11,30 @@ on:
 env:
   CTEST_OUTPUT_ON_FAILURE: 1
   CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
-    
+
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Htest -Bbuild -DENABLE_TEST_COVERAGE=1
+      - uses: actions/checkout@v2
 
-    - name: build
-      run: cmake --build build --config Debug -j4
+      - uses: actions/cache@v2
+        with:
+          path: "**/cpm_modules"
+          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: test
-      run: |
-        cd build
-        ctest --build-config Debug
+      - name: configure
+        run: cmake -Stest -Bbuild -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..a52b0ae 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -10,22 +10,27 @@ on:
 
 env:
   CTEST_OUTPUT_ON_FAILURE: 1
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
 
 jobs:
   build:
-
     runs-on: windows-latest
-    
+
     steps:
-    - uses: actions/checkout@v1
-    
-    - name: configure
-      run: cmake -Htest -Bbuild
+      - uses: actions/checkout@v2
 
-    - name: build
-      run: cmake --build build --config Debug -j4
+      - uses: actions/cache@v2
+        with:
+          path: "**/cpm_modules"
+          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
 
-    - name: test
-      run: |
-        cd build
-        ctest --build-config Debug
+      - name: configure
+        run: cmake -Stest -Bbuild
+
+      - name: build
+        run: cmake --build build --config Debug -j4
+
+      - name: test
+        run: |
+          cd build
+          ctest --build-config Debug
diff --git a/.gitignore b/.gitignore
index a4cfc5d..d54a4f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /build*
 /.vscode
+/cpm_modules
 .DS_Store
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 81e35e6..550a081 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -84,6 +84,7 @@ string(TOLOWER ${PROJECT_NAME}/version.h VERSION_HEADER_LOCATION)
 packageProject(
   NAME ${PROJECT_NAME}
   VERSION ${PROJECT_VERSION}
+  NAMESPACE ${PROJECT_NAME}
   BINARY_DIR ${PROJECT_BINARY_DIR}
   INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
   INCLUDE_DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION}
diff --git a/documentation/CMakeLists.txt b/documentation/CMakeLists.txt
index 8373176..f4fd8a1 100644
--- a/documentation/CMakeLists.txt
+++ b/documentation/CMakeLists.txt
@@ -11,9 +11,8 @@ CPMAddPackage(NAME Greeter SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/..)
 CPMAddPackage(
   NAME MCSS
   DOWNLOAD_ONLY YES
-  # TODO: patched version until https://github.com/mosra/m.css/pull/171 is resolved
-  GITHUB_REPOSITORY TheLartians/m.css
-  GIT_TAG 1bf162b96d5bfefc9967a80cef138f1270ffa415
+  GITHUB_REPOSITORY mosra/m.css
+  GIT_TAG 42d4a9a48f31f5df6e246c948403b54b50574a2a
 )
 
 # ---- Doxygen variables ----
diff --git a/standalone/CMakeLists.txt b/standalone/CMakeLists.txt
index 23ff942..4bb837d 100644
--- a/standalone/CMakeLists.txt
+++ b/standalone/CMakeLists.txt
@@ -27,4 +27,4 @@ add_executable(GreeterStandalone ${sources})
 
 set_target_properties(GreeterStandalone PROPERTIES CXX_STANDARD 17 OUTPUT_NAME "Greeter")
 
-target_link_libraries(GreeterStandalone Greeter cxxopts)
+target_link_libraries(GreeterStandalone Greeter::Greeter cxxopts)