diff --git a/.gitmodules b/.gitmodules
index 3b3e0da..e57110f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -6,14 +6,6 @@
 	path = extern/SDL_image
 	url = https://github.com/libsdl-org/SDL_image.git
 	branch = release-2.8.x
-[submodule "libpng"]
-	path = extern/libpng
-	url = https://github.com/glennrp/libpng.git
-	branch = libpng16
-[submodule "zlib"]
-	path = extern/zlib
-	url = https://github.com/madler/zlib.git
-	branch = master
 [submodule "extern/SDL_mixer"]
 	path = extern/SDL_mixer
 	url = https://github.com/libsdl-org/SDL_mixer.git
diff --git a/extern/libpng b/extern/libpng
deleted file mode 160000
index 71b9b5e..0000000
--- a/extern/libpng
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 71b9b5e16ef751d973a3935284382bc344ff9941
diff --git a/extern/zlib b/extern/zlib
deleted file mode 160000
index 09155ea..0000000
--- a/extern/zlib
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 09155eaa2f9270dc4ed1fa13e2b4b2613e6e4851