diff --git a/win32/build/libs_version.txt b/win32/build/libs_version.txt
index f57c931a43c..045806cf56e 100644
--- a/win32/build/libs_version.txt
+++ b/win32/build/libs_version.txt
@@ -3,11 +3,11 @@ cclient-2007f
 freetype-2.8.0
 icu-57.1
 jpeglib-9b
-libcurl-7.55.0
+libcurl-7.56.0
 libiconv-1.15
 libmcrypt-2.5.8
 libmpir-3.0.0
-libpng-1.6.29
+libpng-1.6.34
 libpq-9.6.2
 libssh2-1.8.0
 libtidy-20090406