diff --git a/.gitmodules b/.gitmodules
index 1c49a67f..577e0a81 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -9,7 +9,7 @@
 [submodule "external/libpng"]
 	path = external/libpng
 	url = https://github.com/libsdl-org/libpng.git
-	branch = v1.6.37-SDL
+	branch = v1.6.40-SDL
 [submodule "external/libwebp"]
 	path = external/libwebp
 	url = https://github.com/libsdl-org/libwebp.git
diff --git a/external/libpng b/external/libpng
index 99917305..bab1405b 160000
--- a/external/libpng
+++ b/external/libpng
@@ -1 +1 @@
-Subproject commit 999173059e2651fab2a0102eeba18748c4bd9827
+Subproject commit bab1405bf3c2ac72b0136c54a7b7109eef1f7c10