diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index c69e591e8..000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,142 +0,0 @@
----
-language: cpp
-dist: focal
-jobs:
-    include:
-        - name: "Linux GCC"
-          os: linux
-          compiler: gcc
-          env: LIBRARY_COMBO=gnu-gnu-gnu
-        - name: "Linux Clang gnustep-1.9"
-          os: linux
-          compiler: clang
-          env: LIBRARY_COMBO=ng-gnu-gnu RUNTIME_VERSION=gnustep-1.9
-        - name: "Linux Clang gnustep-1.9 disable-mixedabi"
-          os: linux
-          compiler: clang
-          env: LIBRARY_COMBO=ng-gnu-gnu RUNTIME_VERSION=gnustep-1.9 BASE_ABI=--disable-mixedabi
-        - name: "Linux Clang gnustep-2.0"
-          os: linux
-          compiler: clang
-          env: LIBRARY_COMBO=ng-gnu-gnu RUNTIME_VERSION=gnustep-2.0
-        - name: "Linux Clang gnustep-2.0 disable-mixedabi"
-          os: linux
-          compiler: clang
-          env: LIBRARY_COMBO=ng-gnu-gnu RUNTIME_VERSION=gnustep-2.0 BASE_ABI=--disable-mixedabi
-        - name: "Windows GCC MinGW-w64 i686"
-          os: windows
-          compiler: gcc
-          env: LIBRARY_COMBO=gnu-gnu-gnu MSYSTEM=mingw32 ARCH=i686
-        - name: "Windows GCC MinGW-w64 x86_64"
-          os: windows
-          compiler: gcc
-          env: LIBRARY_COMBO=gnu-gnu-gnu MSYSTEM=mingw64 ARCH=x86_64
-    # allow Windows builds to fail (remove once all tests are passing on Windows)
-    allow_failures:
-        - os: windows
-before_install: |
-    case $TRAVIS_OS_NAME in
-    linux)
-        sudo apt-get -qq update
-        sudo apt-get install -y cmake pkg-config libgnutls28-dev libgmp-dev libffi-dev libicu-dev libxml2-dev libxslt1-dev libssl-dev libavahi-client-dev zlib1g-dev
-        case $LIBRARY_COMBO in
-        gnu-gnu-gnu)
-            if [ $CC = 'gcc' ]; then
-                sudo apt-get install -y gobjc
-            fi
-            sudo apt-get install -y libobjc-9-dev libblocksruntime-dev
-            ;;
-        ng-gnu-gnu)
-            curl -s -o - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
-            sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main" && sudo apt-get update -qq
-            sudo apt-get install -y clang-9 libkqueue-dev libpthread-workqueue-dev
-            sudo update-alternatives   --install /usr/bin/clang   clang   /usr/bin/clang-9   10 \
-                                       --slave   /usr/bin/clang++ clang++ /usr/bin/clang++-9
-            export PATH=$(echo "$PATH" | sed -e 's/:\/usr\/local\/clang-7.0.0\/bin//')
-            if [ "$RUNTIME_VERSION" = "gnustep-2.0" ]; then
-               sudo update-alternatives --install "/usr/bin/ld" "ld" "/usr/bin/ld.gold" 10
-            fi;
-            ## libdispatch requires a fairly recent version of cmake
-            curl -LO https://cmake.org/files/v3.15/cmake-3.15.5-Linux-x86_64.tar.gz
-            tar xf cmake-3.15.5-Linux-x86_64.tar.gz
-            mv cmake-3.15.5-Linux-x86_64 $HOME/cmake
-            export PATH=$HOME/cmake/:$HOME/cmake/bin:$PATH
-            ;;
-        esac
-        ;;
-    windows)
-        ## from https://docs.travis-ci.com/user/reference/windows/#how-do-i-use-msys2
-        [[ ! -f C:/tools/msys64/msys2_shell.cmd ]] && rm -rf C:/tools/msys64
-        choco uninstall -y mingw
-        choco upgrade --no-progress -y msys2
-        export msys2='cmd //C RefreshEnv.cmd '
-        export msys2+='& set MSYS=winsymlinks:nativestrict '
-        export msys2+='& C:\\tools\\msys64\\msys2_shell.cmd -defterm -no-start'
-        export mingw="$msys2 -$MSYSTEM -full-path -here -c "\"\$@"\" --"
-        export msys2+=" -msys2 -c "\"\$@"\" --"
-        ## Install MSYS2 packages required by GNUstep
-        $msys2 pacman --sync --noconfirm --needed \
-            mingw-w64-$ARCH-gcc-objc \
-            make \
-            pkg-config \
-            libxml2-devel \
-            libxslt-devel \
-            libffi-devel \
-            libgnutls-devel \
-            icu-devel \
-            mingw-w64-$ARCH-pkg-config \
-            mingw-w64-$ARCH-libxml2 \
-            mingw-w64-$ARCH-libxslt \
-            mingw-w64-$ARCH-libffi \
-            mingw-w64-$ARCH-gnutls \
-            mingw-w64-$ARCH-icu \
-        ##
-        taskkill //IM gpg-agent.exe //F  # https://travis-ci.community/t/4967
-        export PATH=/C/tools/msys64/$MSYSTEM/bin:$PATH
-        ## disable conversion to native-form paths when configuring GNUstep Make in travis-deps.sh
-        ## https://www.msys2.org/wiki/Porting/#filesystem-namespaces
-        export MSYS2_ARG_CONV_EXCL="--prefix="
-        ;;
-    esac
-install: ./travis-deps.sh
-before_script: |
-    case $TRAVIS_OS_NAME in
-    linux)
-        DEP_ROOT=$HOME/staging
-        export PATH=$DEP_ROOT/bin:$PATH
-        ;;
-    windows)
-        DEP_ROOT=/c/staging
-        setx -m PATH "C:\staging;%PATH%"
-        CONFIGURE_OPTS=--without-unwind
-        ;;
-    esac
-    export LIBRARY_PATH=$DEP_ROOT/lib:$DEP_ROOT/lib64:$LIBRARY_PATH
-    export LD_LIBRARY_PATH=$DEP_ROOT/lib:$DEP_ROOT/lib64:$LD_LIBRARY_PATH
-    case $LIBRARY_COMBO in
-    gnu-gnu-gnu)
-        export CPATH=/usr/lib/gcc/x86_64-linux-gnu/9/include
-        ;;
-    ng-gnu-gnu)
-        export CPATH=$DEP_ROOT/include
-        ;;
-    esac
-    export GNUSTEP_MAKEFILES=$DEP_ROOT/share/GNUstep/Makefiles
-    . $GNUSTEP_MAKEFILES/GNUstep.sh
-script:
-    # configure and make need to be executed via MinGW shell on Windows ($mingw is undefined on Linux)
-    - $mingw ./configure $BASE_ABI $CONFIGURE_OPTS || (cat config.log && false)
-    - ($mingw make || (cat config.log && false)) && $mingw make install && $mingw make check || (cat Tests/tests.log && false)
-
-# set up packages cache (currently used on Windows only)
-before_cache: |
-    case $TRAVIS_OS_NAME in
-    windows)
-        # https://unix.stackexchange.com/a/137322/107554
-        $msys2 pacman --sync --clean --noconfirm
-        ;;
-    esac
-cache:
-    directories:
-        - $HOME/AppData/Local/Temp/chocolatey
-        - /C/tools/msys64
diff --git a/travis-deps.sh b/travis-deps.sh
deleted file mode 100755
index e2baf3c00..000000000
--- a/travis-deps.sh
+++ /dev/null
@@ -1,82 +0,0 @@
-#! /usr/bin/env sh
-
-set -ex
-
-DEP_SRC=$HOME/dependency_source/
-
-case $TRAVIS_OS_NAME in
-linux)
-    DEP_ROOT=$HOME/staging
-    ;;
-windows)
-    DEP_ROOT=/c/staging
-    ;;
-esac
-
-install_gnustep_make() {
-    cd $DEP_SRC
-    git clone https://github.com/gnustep/tools-make.git
-    cd tools-make
-    if [ -n "$RUNTIME_VERSION" ]
-    then
-        WITH_RUNTIME_ABI="--with-runtime-abi=${RUNTIME_VERSION}"
-    else
-        WITH_RUNTIME_ABI=""
-    fi
-    $mingw ./configure --prefix=$DEP_ROOT --with-library-combo=$LIBRARY_COMBO $WITH_RUNTIME_ABI
-    $mingw make install
-    echo Objective-C build flags: `$DEP_ROOT/bin/gnustep-config --objc-flags`
-}
-
-install_ng_runtime() {
-    cd $DEP_SRC
-    git clone https://github.com/gnustep/libobjc2.git
-    cd libobjc2
-    git submodule init
-    git submodule sync
-    git submodule update
-    cd ..
-    mkdir libobjc2/build
-    cd libobjc2/build
-    export CC="clang"
-    export CXX="clang++"
-    export CXXFLAGS="-std=c++11"
-    cmake \
-      -DTESTS=off \
-      -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-      -DGNUSTEP_INSTALL_TYPE=NONE \
-      -DCMAKE_INSTALL_PREFIX:PATH=$DEP_ROOT \
-      ../
-    make install
-}
-
-install_libdispatch() {
-    cd $DEP_SRC
-    # will reference upstream after https://github.com/apple/swift-corelibs-libdispatch/pull/534 is merged
-    git clone -b system-blocksruntime https://github.com/ngrewe/swift-corelibs-libdispatch.git
-    mkdir swift-corelibs-libdispatch/build
-    cd swift-corelibs-libdispatch/build
-    export CC="clang"
-    export CXX="clang++"
-    export LIBRARY_PATH=$DEP_ROOT/lib;
-    export LD_LIBRARY_PATH=$DEP_ROOT/lib:$LD_LIBRARY_PATH;
-    export CPATH=$DEP_ROOT/include;
-    cmake \
-      -DBUILD_TESTING=off \
-      -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-      -DCMAKE_INSTALL_PREFIX:PATH=$DEP_ROOT \
-      -DINSTALL_PRIVATE_HEADERS=1 \
-      -DBlocksRuntime_INCLUDE_DIR=$DEP_ROOT/include \
-      -DBlocksRuntime_LIBRARIES=$DEP_ROOT/lib/libobjc.so \
-      ../
-    make install
-}
-
-mkdir -p $DEP_SRC
-if [ "$LIBRARY_COMBO" = 'ng-gnu-gnu' ]
-then
-    install_ng_runtime
-    install_libdispatch
-fi
-
-install_gnustep_make