diff --git a/build/windows_vs2015/build.py b/build/windows_vs2015/build.py
index 7209cf0f6..c602cfe00 100644
--- a/build/windows_vs2015/build.py
+++ b/build/windows_vs2015/build.py
@@ -61,11 +61,11 @@ LEVELDB_VERSION = "1.16.0.5"
 CRC32C_VERSION = "1.1.0"
 SNAPPY_VERSION = "1.1.1.7"
 irrlicht = "irrlicht-1.8.4"
-curl = "curl-7.50.3"
+curl = "curl-7.53.1"
 openal = "openal-soft-1.17.2"
 libogg = "libogg-{}".format(LIBOGG_VERSION)
 libvorbis = "libvorbis-1.3.5"
-zlib = "zlib-1.2.8"
+zlib = "zlib-1.2.11"
 freetype = "freetype-2.7"
 freetype_lib = "27"
 luajit = "LuaJIT-2.0.4"