diff --git a/win32/build/libs_version.txt b/win32/build/libs_version.txt
index d1f9d479867..282afb790bf 100644
--- a/win32/build/libs_version.txt
+++ b/win32/build/libs_version.txt
@@ -1,2 +1,2 @@
 libcurl-7.21.6
-libpng-1.2.45
\ No newline at end of file
+libpng-1.2.46