diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3517c684..fbb1562e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -129,6 +129,13 @@ jobs:
         cmake -E rename build/Release/libpng16_static.lib libpng.lib
         cmake -E rename build/pnglibconf.h pnglibconf.h
 
+    - name: Install GS1 Syntax Engine
+      run: |
+        git clone --depth=1 https://github.com/gitlost/gs1-syntax-engine && cd gs1-syntax-engine/src/c-lib
+        cmake -A WIN32 -B build
+        cmake --build build --config Release
+        cmake -E rename build/Release/gs1encoders.lib gs1encoders.lib
+
     - name: Configure CMake
       working-directory: build
       shell: bash
@@ -154,10 +161,28 @@ jobs:
       shell: bash
       run: git config --global --add safe.directory ${GITHUB_WORKSPACE} && cmake -E make_directory build
 
+    - name: Install zlib
+      shell: bash
+      run: |
+        git clone --depth=1 https://github.com/madler/zlib.git zlib && cd zlib
+        cmake -B build -DCMAKE_BUILD_TYPE=Release -DZLIB_BUILD_TESTING=OFF -DZLIB_BUILD_SHARED=OFF -DZLIB_BUILD_MINIZIP=OFF -DZLIB_INSTALL_COMPAT_DLL=OFF
+        cmake --build build --config Release
+        cmake -E rename build/Release/zs.lib zlib.lib
+        cmake -E rename build/zconf.h zconf.h
+
+    - name: Install libpng
+      shell: bash
+      run: |
+        git clone --depth=1 https://git.code.sf.net/p/libpng/code lpng && cd lpng
+        cmake -B build -DCMAKE_BUILD_TYPE=Release -DPNG_SHARED=OFF -DPNG_TESTS=OFF -DPNG_TOOLS=OFF -DZLIB_ROOT="../zlib"
+        cmake --build build --config Release
+        cmake -E rename build/Release/libpng16_static.lib libpng.lib
+        cmake -E rename build/pnglibconf.h pnglibconf.h
+
     - name: Configure CMake
       working-directory: build
       shell: bash
-      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DZINT_TEST=ON -DZINT_STATIC=ON -DZINT_USE_PNG=OFF -DZINT_USE_QT=OFF
+      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DZINT_TEST=ON -DZINT_STATIC=ON -DZINT_USE_QT=OFF -DZLIB_ROOT="../zlib" -DPNG_ROOT="../lpng"
 
     - name: Build
       working-directory: build