diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0d0cf5d..d1e372b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -41,7 +41,6 @@ jobs:
           package_suffix: 'win64'
           win_arch: "x64"
           qt_arch: win64_msvc2019_64
-          cmake_extra_args: '-DZLIB_ROOT=C:/zlib'
           qt_tools: tools_ninja, tools_cmake
         - interface: gui
           cmake_cli_arg: 'OFF'
@@ -52,10 +51,6 @@ jobs:
 
     env:
       qt_installation_path: ${{ github.workspace }}
-      zlib_path: ${{ github.workspace }}/../zlib-git
-      zlib_build_path: ${{ github.workspace }}/../build-zlib-git
-      zlib_installation_path: C:/zlib
-      zlib_version: "1.3.1"
       lz4_path: ${{ github.workspace }}/../lz4-git
       lz4_build_path: ${{ github.workspace }}/../build-lz4-git
       lz4_installation_path: ${{ github.workspace }}/../lz4
@@ -102,21 +97,6 @@ jobs:
       run: |
         echo "PRERELEASE_STRING= unstable build" >> $GITHUB_ENV
 
-    - name: Cache Zlib
-      id: cache-zlib
-      if: runner.os == 'Windows'
-      uses: actions/cache@v4
-      with:
-        path: ${{ env.zlib_installation_path }}
-        key: ${{ runner.os }}${{ matrix.win_arch }}-zlib-${{ env.zlib_version}}
-
-    - name: Install Zlib
-      if: (runner.os == 'Windows') && (steps.cache-zlib.outputs.cache-hit != 'true')
-      run: |
-        git clone -q --depth 1 --single-branch --branch=v${{ env.zlib_version }} https://github.com/madler/zlib ${{ env.zlib_path }}
-        cmake -S${{ env.zlib_path }} -B${{ env.zlib_build_path }} -DCMAKE_BUILD_TYPE=${{ env.CMAKE_BUILD_TYPE }} -DCMAKE_INSTALL_PREFIX=${{ env.zlib_installation_path }}
-        cmake --build ${{ env.zlib_build_path }} --target install -j3
-
     - name: Cache lz4
       id: cache-lz4
       uses: actions/cache@v4