diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
deleted file mode 100644
index 5ee44a04e..000000000
--- a/.github/workflows/codeql-analysis.yml
+++ /dev/null
@@ -1,54 +0,0 @@
-name: "Code scanning - action"
-
-on:
-  push:
-    branches: [develop, ]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [develop]
-  schedule:
-    - cron: '0 19 * * 1'
-
-jobs:
-  CodeQL-Build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v2
-      with:
-        # We must fetch at least the immediate parents so that if this is
-        # a pull request then we can checkout the head.
-        fetch-depth: 2
-
-    # If this run was triggered by a pull request event, then checkout
-    # the head of the pull request instead of the merge commit.
-    - run: git checkout HEAD^2
-      if: ${{ github.event_name == 'pull_request' }}
-
-    # Initializes the CodeQL tools for scanning.
-    - name: Initialize CodeQL
-      uses: github/codeql-action/init@v1
-      # Override language selection by uncommenting this and choosing your languages
-      # with:
-      #   languages: go, javascript, csharp, python, cpp, java
-
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: Autobuild
-      uses: github/codeql-action/autobuild@v1
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
-
-    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v1
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
deleted file mode 100644
index 5b178ad05..000000000
--- a/.github/workflows/macos.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-name: macOS
-
-on: [push, pull_request]
-
-jobs:
-  build:
-
-    runs-on: macos-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: cmake
-      run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
-    - name: build
-      run: cmake --build build --parallel 10
-    - name: test
-      run: cd build ; ctest -j 10 --output-on-failure
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
deleted file mode 100644
index 1a47a885c..000000000
--- a/.github/workflows/ubuntu.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: Ubuntu
-
-on: [push, pull_request]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: cmake
-      run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
-    - name: build
-      run: cmake --build build --parallel 10
-    - name: test
-      run: cd build ; ctest -j 10 --output-on-failure
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
deleted file mode 100644
index 5846cf750..000000000
--- a/.github/workflows/windows.yml
+++ /dev/null
@@ -1,68 +0,0 @@
-name: Windows
-
-on: [push, pull_request]
-
-jobs:
-  msvc2019:
-    runs-on: windows-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: cmake
-      run: cmake -S . -B build -G "Visual Studio 16 2019" -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
-    - name: build
-      run: cmake --build build --parallel 10
-    - name: test
-      run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
-
-  clang9:
-    runs-on: windows-latest
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: install Clang
-        run: curl -fsSL -o LLVM9.exe https://releases.llvm.org/9.0.0/LLVM-9.0.0-win64.exe ; 7z x LLVM9.exe -y -o"C:/Program Files/LLVM"
-      - name: cmake
-        run: cmake -S . -B build -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" -G"MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
-      - name: build
-        run: cmake --build build --parallel 10
-      - name: test
-        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
-
-  clang10:
-    runs-on: windows-latest
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: install Clang
-        run: curl -fsSL -o LLVM10.exe https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0/LLVM-10.0.0-win64.exe ; 7z x LLVM10.exe -y -o"C:/Program Files/LLVM"
-      - name: cmake
-        run: cmake -S . -B build -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" -G"MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
-      - name: build
-        run: cmake --build build --parallel 10
-      - name: test
-        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
-
-  clang-cl-10-x64:
-    runs-on: windows-latest
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: cmake
-        run: cmake -S . -B build -G "Visual Studio 16 2019" -A x64 -T ClangCL -DJSON_BuildTests=On
-      - name: build
-        run: cmake --build build --config Debug --parallel 10
-      - name: test
-        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
-
-  clang-cl-10-x86:
-    runs-on: windows-latest
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: cmake
-        run: cmake -S . -B build -G "Visual Studio 16 2019" -A Win32 -T ClangCL -DJSON_BuildTests=On
-      - name: build
-        run: cmake --build build --config Debug --parallel 10
-      - name: test
-        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
diff --git a/.travis.yml b/.travis.yml
index bf749c1e3..745443bb7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,207 +17,8 @@ group: edge
 matrix:
   include:
 
-  # Valgrind
-  - os: linux
-    compiler: gcc
-    env:
-      - COMPILER=g++-4.9
-      - CMAKE_OPTIONS=-DJSON_Valgrind=ON
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-4.9', 'valgrind', 'ninja-build']
-
-  # clang sanitizer
-  - os: linux
-    compiler: clang
-    env:
-      - COMPILER=clang++-7
-      - CMAKE_OPTIONS=-DJSON_Sanitizer=ON
-      - UBSAN_OPTIONS=print_stacktrace=1,suppressions=$(pwd)/test/src/UBSAN.supp
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-7']
-        packages: ['g++-6', 'clang-7', 'ninja-build']
-    before_script:
-      - export PATH=$PATH:/usr/lib/llvm-7/bin
-
-  # cppcheck
-  - os: linux
-    compiler: gcc
-    env:
-      - COMPILER=g++-4.9
-      - SPECIAL=cppcheck
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-4.9', 'cppcheck', 'ninja-build']
-    after_success:
-      - make cppcheck
-
-  # no exceptions
-  - os: linux
-    compiler: gcc
-    env:
-      - COMPILER=g++-4.9
-      - CMAKE_OPTIONS=-DJSON_NoExceptions=ON
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-4.9', 'ninja-build']
-
-  # check amalgamation
-  - os: linux
-    compiler: gcc
-    env:
-      - COMPILER=g++-4.9
-      - SPECIAL=amalgamation
-      - MULTIPLE_HEADERS=ON
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-4.9', 'astyle', 'ninja-build']
-    after_success:
-      - make check-amalgamation
-
-  # Coveralls (http://gronlier.fr/blog/2015/01/adding-code-coverage-to-your-c-project/)
-
-  - os: linux
-    compiler: gcc
-    dist: bionic
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-7', 'ninja-build']
-    before_script:
-      - pip install --user cpp-coveralls
-    after_success:
-      - coveralls --build-root test --include include/nlohmann --gcov 'gcov-7' --gcov-options '\-lp'
-    env:
-      - COMPILER=g++-7
-      - CMAKE_OPTIONS=-DJSON_Coverage=ON
-      - MULTIPLE_HEADERS=ON
-
-  # Coverity (only for branch coverity_scan)
-
-  - os: linux
-    compiler: clang
-    before_install: echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-certificates.crt
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
-        packages: ['g++-6', 'clang-3.6', 'ninja-build']
-      coverity_scan:
-        project:
-          name: "nlohmann/json"
-          description: "Build submitted via Travis CI"
-        notification_email: niels.lohmann@gmail.com
-        build_command_prepend: "mkdir coverity_build ; cd coverity_build ; cmake .. ; cd .."
-        build_command: "make -C coverity_build"
-        branch_pattern: coverity_scan
-    env:
-      - SPECIAL=coverity
-      - COMPILER=clang++-3.6
-        # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
-        #   via the "travis encrypt" command using the project repo's public key
-      - secure: "m89SSgE+ASLO38rSKx7MTXK3n5NkP9bIx95jwY71YEiuFzib30PDJ/DifKnXxBjvy/AkCGztErQRk/8ZCvq+4HXozU2knEGnL/RUitvlwbhzfh2D4lmS3BvWBGS3N3NewoPBrRmdcvnT0xjOGXxtZaJ3P74TkB9GBnlz/HmKORA="
-
-  # OSX / Clang
-
-  - os: osx
-    osx_image: xcode9.3
-
-  - os: osx
-    osx_image: xcode9.4
-
-  - os: osx
-    osx_image: xcode10
-
-  - os: osx
-    osx_image: xcode10.1
-
-  - os: osx
-    osx_image: xcode10.2
-
-  - os: osx
-    osx_image: xcode11.2
-
-  - os: osx
-    osx_image: xcode12
-
-  - os: osx
-    osx_image: xcode12
-    env:
-      - IMPLICIT_CONVERSIONS=OFF
-
   # Linux / GCC
 
-  - os: linux
-    compiler: gcc
-    env: COMPILER=g++-4.8
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-4.8', 'ninja-build']
-
-  - os: linux
-    compiler: gcc
-    env: COMPILER=g++-4.9
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-4.9', 'ninja-build']
-
-  - os: linux
-    compiler: gcc
-    env: COMPILER=g++-5
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-5', 'ninja-build']
-
-  - os: linux
-    compiler: gcc
-    env: COMPILER=g++-6
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-6', 'ninja-build']
-
-  - os: linux
-    compiler: gcc
-    env: COMPILER=g++-7
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-7', 'ninja-build']
-
-  - os: linux
-    compiler: gcc
-    env: COMPILER=g++-8
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-8', 'ninja-build']
-
-  - os: linux
-    compiler: gcc
-    env: COMPILER=g++-9
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-9', 'ninja-build']
-
-  - os: linux
-    compiler: gcc
-    env:
-      - COMPILER=g++-9
-      - IMPLICIT_CONVERSIONS=OFF
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-9', 'ninja-build']
-
   - os: linux
     compiler: gcc
     env:
@@ -230,78 +31,6 @@ matrix:
 
   # Linux / Clang
 
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-3.5
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.5']
-        packages: ['g++-6', 'clang-3.5', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-3.6
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
-        packages: ['g++-6', 'clang-3.6', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-3.7
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.7']
-        packages: ['g++-6', 'clang-3.7', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-3.8
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-6', 'clang-3.8', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-3.9
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-6', 'clang-3.9', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-4.0
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-4.0']
-        packages: ['g++-6', 'clang-4.0', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-5.0
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
-        packages: ['g++-6', 'clang-5.0', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-6.0
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-6.0']
-        packages: ['g++-6', 'clang-6.0', 'ninja-build']
-
-  - os: linux
-    compiler: clang
-    env: COMPILER=clang++-7
-    addons:
-      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-7']
-        packages: ['g++-6', 'clang-7', 'ninja-build']
-
   - os: linux
     compiler: clang
     env:
@@ -333,10 +62,13 @@ script:
   # by default, use implicit conversions
   - if [[ "${IMPLICIT_CONVERSIONS}" == "" ]]; then export IMPLICIT_CONVERSIONS=ON; fi
 
+  # force verbose build
+  - CMAKE_OPTIONS+=" -DCMAKE_VERBOSE_MAKEFILE=ON"
+
   # compile and execute unit tests
   - mkdir -p build && cd build
-  - cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -DJSON_ImplicitConversions=${IMPLICIT_CONVERSIONS} -DJSON_BuildTests=On -GNinja && cmake --build . --config Release
-  - ctest -C Release --timeout 2700 -V -j
+  - cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -DJSON_ImplicitConversions=${IMPLICIT_CONVERSIONS} -DJSON_BuildTests=On -GNinja && cmake --build . --config Release --target test-conversions
+  - ctest -C Release --timeout 2700 -V -R  test-conversions -j
   - cd ..
 
   # check if homebrew works (only checks develop branch)