diff --git a/.github/workflows/create-release-artifacts.yml b/.github/workflows/create-release-artifacts.yml
index 049dc6d0..602e31b9 100644
--- a/.github/workflows/create-release-artifacts.yml
+++ b/.github/workflows/create-release-artifacts.yml
@@ -45,7 +45,7 @@ jobs:
       - name: Build libpng
         shell: bash
         run: |
-          cmake -S libpng -B pngbuild -A ${{ matrix.platform }} -Wno-dev -DCMAKE_INSTALL_PREFIX=install_dir -DPNG_SHARED=ON -DPNG_STATIC=OFF -DPNG_TESTS=OFF -DPNG_BUILD_ZLIB=ON -DZLIB_INCLUDE_DIR="$PWD"/install_dir/include -DZLIB_LIBRARY="$PWD"/install_dir/lib/zlib.lib
+          cmake -S libpng -B pngbuild -A ${{ matrix.platform }} -Wno-dev -DCMAKE_INSTALL_PREFIX=install_dir -DPNG_SHARED=ON -DPNG_STATIC=OFF -DPNG_TESTS=OFF
           cmake --build pngbuild --config Release -j
         if: steps.cache.outputs.cache-hit != 'true'
       - name: Install libpng
@@ -54,7 +54,7 @@ jobs:
       - name: Build Windows binaries
         shell: bash
         run: |
-          cmake -S . -B build -A ${{ matrix.platform }} -DCMAKE_INSTALL_PREFIX=install_dir -DCMAKE_BUILD_TYPE=Release -DZLIB_LIBRARY="$PWD"/install_dir/lib/zlib.lib -DZLIB_INCLUDE_DIR="$PWD"/install_dir/include -DPNG_LIBRARY="$PWD"/install_dir/lib/libpng16.lib -DPNG_INCLUDE_DIR="$PWD"/install_dir/include
+          cmake -S . -B build -A ${{ matrix.platform }} -DCMAKE_INSTALL_PREFIX=install_dir -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release -j --verbose
           cmake --install build --verbose --prefix install_dir --strip
       - name: Package binaries
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 70c71973..fd70f06c 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -172,7 +172,7 @@ jobs:
       - name: Build libpng
         shell: bash
         run: |
-          cmake -S libpng -B pngbuild -A ${{ matrix.platform }} -Wno-dev -DCMAKE_INSTALL_PREFIX=install_dir -DPNG_SHARED=ON -DPNG_STATIC=OFF -DPNG_TESTS=OFF -DPNG_BUILD_ZLIB=ON -DZLIB_INCLUDE_DIR="$PWD"/install_dir/include -DZLIB_LIBRARY="$PWD"/install_dir/lib/zlib.lib
+          cmake -S libpng -B pngbuild -A ${{ matrix.platform }} -Wno-dev -DCMAKE_INSTALL_PREFIX=install_dir -DPNG_SHARED=ON -DPNG_STATIC=OFF -DPNG_TESTS=OFF
           cmake --build pngbuild --config Release -j
         if: steps.cache.outputs.cache-hit != 'true'
       - name: Install libpng
@@ -181,7 +181,7 @@ jobs:
       - name: Build Windows binaries
         shell: bash
         run: |
-          cmake -S . -B build -A ${{ matrix.platform }} -DCMAKE_INSTALL_PREFIX=install_dir -DCMAKE_BUILD_TYPE=Release -DZLIB_LIBRARY="$PWD"/install_dir/lib/zlib.lib -DZLIB_INCLUDE_DIR="$PWD"/install_dir/include -DPNG_LIBRARY="$PWD"/install_dir/lib/libpng16.lib -DPNG_INCLUDE_DIR="$PWD"/install_dir/include
+          cmake -S . -B build -A ${{ matrix.platform }} -DCMAKE_INSTALL_PREFIX=install_dir -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release -j --verbose
           cmake --install build --verbose --prefix install_dir
           cmake --install build --verbose --component "Test support programs"