diff --git a/.gitmodules b/.gitmodules
index f87c05c..15d4e3e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,7 @@
 	path = lib/libpng
 	url = https://github.com/glennrp/libpng.git
 	branch = libpng16
+[submodule "lib/zlib"]
+	path = lib/zlib
+	url = https://github.com/madler/zlib.git
+	branch = master
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d540193..c6b3d10 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,7 @@ add_subdirectory(lib/libpng EXCLUDE_FROM_ALL)
 include_directories(
     ${SDL2_INCLUDE_DIRS}
     ${SDL2_IMAGE_INCLUDE_DIRS}
+    ${ZLIB_IMAGE_INCLUDE_DIRS}
     ${PNG_INCLUDE_DIRS})
 
 file(GLOB_RECURSE SOURCES src/*.cpp)
@@ -21,6 +22,7 @@ add_executable(${PROJECT_NAME} ${SOURCES})
 target_link_libraries(${PROJECT_NAME} PRIVATE
     SDL2
     SDL2_image
+    ${ZLIB_LIBRARY}
     ${PNG_LIBRARIES}
 )
 
diff --git a/lib/zlib b/lib/zlib
new file mode 160000
index 0000000..09155ea
--- /dev/null
+++ b/lib/zlib
@@ -0,0 +1 @@
+Subproject commit 09155eaa2f9270dc4ed1fa13e2b4b2613e6e4851