diff --git a/contrib/crossrpms/cygwin/i686/Makefile.am b/contrib/crossrpms/cygwin/i686/Makefile.am
index 332bba4830..bf073e6a07 100644
--- a/contrib/crossrpms/cygwin/i686/Makefile.am
+++ b/contrib/crossrpms/cygwin/i686/Makefile.am
@@ -36,8 +36,8 @@ TERMINFO_VERS = 5.7_20091114-14
 TERMINFO_RPMREL = 0.20100726.0%{?dist}
 include ../terminfo.am
 
-ZLIB_VERS = 1.2.3-10
-ZLIB_RPMREL = 0.20100319.0%{?dist}
+ZLIB_VERS = 1.2.5-1
+ZLIB_RPMREL = 0.20101216.0%{?dist}
 include ../zlib.am
 
 GMP_VERS = 4.3.1-3
diff --git a/contrib/crossrpms/cygwin/i686/i686-pc-cygwin-zlib.spec b/contrib/crossrpms/cygwin/i686/i686-pc-cygwin-zlib.spec
index 13d11c785d..d604fa5385 100644
--- a/contrib/crossrpms/cygwin/i686/i686-pc-cygwin-zlib.spec
+++ b/contrib/crossrpms/cygwin/i686/i686-pc-cygwin-zlib.spec
@@ -30,11 +30,11 @@
 %define _host_rpmprefix %{nil}
 %endif
 
-%define zlib_version 1.2.3-10
-%define zlib_rpmvers %{expand:%(echo 1.2.3-10 | tr - _)} 
+%define zlib_version 1.2.5-1
+%define zlib_rpmvers %{expand:%(echo 1.2.5-1 | tr - _)} 
 
 Name:         i686-pc-cygwin-zlib
-Release:      0.20100319.0%{?dist}
+Release:      0.20101216.0%{?dist}
 License:      GPL
 Group:        Development/Tools