diff --git a/docs/INSTALL b/docs/INSTALL
index 737128b369c0cdb4b2d437930c8840371729b4a8..50c82e104fe1277c2c93e5d9abc7d5c051aaf36e 100644
--- a/docs/INSTALL
+++ b/docs/INSTALL
@@ -220,7 +220,7 @@ Win32
    adjust as necessary. It is also possible to override these paths with
    environment variables, for example:
 
-     set ZLIB_PATH=c:\zlib-1.2.7
+     set ZLIB_PATH=c:\zlib-1.2.8
      set OPENSSL_PATH=c:\openssl-0.9.8y
      set LIBSSH2_PATH=c:\libssh2-1.4.3
 
@@ -323,7 +323,7 @@ Win32
    documentation on how to compile zlib. Define the ZLIB_PATH environment
    variable to the location of zlib.h and zlib.lib, for example:
 
-     set ZLIB_PATH=c:\zlib-1.2.7
+     set ZLIB_PATH=c:\zlib-1.2.8
 
    Then run 'nmake vc-zlib' in curl's root directory.
 
diff --git a/docs/examples/Makefile.m32 b/docs/examples/Makefile.m32
index 10ad698ade2fcefacefaed601e669bb16bb669b9..6bfb9fa813a4f4df956a8e6d18d748c806a02682 100644
--- a/docs/examples/Makefile.m32
+++ b/docs/examples/Makefile.m32
@@ -27,14 +27,14 @@
 ## Example: mingw32-make -f Makefile.m32 CFG=-zlib-ssl-spi-winidn
 ##
 ## Hint: you can also set environment vars to control the build, f.e.:
-## set ZLIB_PATH=c:/zlib-1.2.7
+## set ZLIB_PATH=c:/zlib-1.2.8
 ## set ZLIB=1
 #
 ###########################################################################
 
 # Edit the path below to point to the base of your Zlib sources.
 ifndef ZLIB_PATH
-ZLIB_PATH = ../../../zlib-1.2.7
+ZLIB_PATH = ../../../zlib-1.2.8
 endif
 # Edit the path below to point to the base of your OpenSSL package.
 ifndef OPENSSL_PATH
diff --git a/docs/examples/Makefile.netware b/docs/examples/Makefile.netware
index 44fde7e999ecab55158e3ac134167452be4056f5..2816cbd77f8256f71af83338b4f4dc7d7182fc51 100644
--- a/docs/examples/Makefile.netware
+++ b/docs/examples/Makefile.netware
@@ -14,7 +14,7 @@ endif
 
 # Edit the path below to point to the base of your Zlib sources.
 ifndef ZLIB_PATH
-ZLIB_PATH = ../../../zlib-1.2.7
+ZLIB_PATH = ../../../zlib-1.2.8
 endif
 
 # Edit the path below to point to the base of your OpenSSL package.
diff --git a/lib/Makefile.Watcom b/lib/Makefile.Watcom
index ff991dc31199c23a4e80f7a7c26ed738f42ff447..b775365312899fe425d04b2f51b56b74d3923515 100644
--- a/lib/Makefile.Watcom
+++ b/lib/Makefile.Watcom
@@ -83,7 +83,7 @@ CFLAGS += -dWANT_IDN_PROTOTYPES
 !ifdef %zlib_root
 ZLIB_ROOT = $(%zlib_root)
 !else
-ZLIB_ROOT = ..$(DS)..$(DS)zlib-1.2.7
+ZLIB_ROOT = ..$(DS)..$(DS)zlib-1.2.8
 !endif
 
 !ifdef %libssh2_root
diff --git a/lib/Makefile.b32 b/lib/Makefile.b32
index fbd584fb6c2a6987d063ad06614d8183244c779c..86251ba0b64538fa002969742a8b2e26c4ea3cf8 100644
--- a/lib/Makefile.b32
+++ b/lib/Makefile.b32
@@ -22,7 +22,7 @@ BCCDIR = $(MAKEDIR)\..
 
 # Edit the path below to point to the base of your Zlib sources.
 !ifndef ZLIB_PATH
-ZLIB_PATH = ..\..\zlib-1.2.7
+ZLIB_PATH = ..\..\zlib-1.2.8
 !endif
 
 # Edit the path below to point to the base of your OpenSSL package.
diff --git a/lib/Makefile.m32 b/lib/Makefile.m32
index 3df923a724b7116c0f2ea992ef36162db18688b6..a401c71f6232db3a12013c290bb6605b3795a27b 100644
--- a/lib/Makefile.m32
+++ b/lib/Makefile.m32
@@ -7,14 +7,14 @@
 ## Example: mingw32-make -f Makefile.m32 CFG=-zlib-ssl-sspi-winidn
 ##
 ## Hint: you can also set environment vars to control the build, f.e.:
-## set ZLIB_PATH=c:/zlib-1.2.7
+## set ZLIB_PATH=c:/zlib-1.2.8
 ## set ZLIB=1
 #
 ###########################################################################
 
 # Edit the path below to point to the base of your Zlib sources.
 ifndef ZLIB_PATH
-ZLIB_PATH = ../../zlib-1.2.7
+ZLIB_PATH = ../../zlib-1.2.8
 endif
 # Edit the path below to point to the base of your OpenSSL package.
 ifndef OPENSSL_PATH
diff --git a/lib/Makefile.netware b/lib/Makefile.netware
index cd87c8d184a1bbc03306f0bdb21a7e78f2af519c..058047bb2b94b0928f47ee97451419789709e50b 100644
--- a/lib/Makefile.netware
+++ b/lib/Makefile.netware
@@ -14,7 +14,7 @@ endif
 
 # Edit the path below to point to the base of your Zlib sources.
 ifndef ZLIB_PATH
-ZLIB_PATH = ../../zlib-1.2.7
+ZLIB_PATH = ../../zlib-1.2.8
 endif
 
 # Edit the path below to point to the base of your OpenSSL package.
diff --git a/lib/Makefile.vc6 b/lib/Makefile.vc6
index 18dfbb97c83a1e44b03beebba90f36cac0d21326..f22e0c3551dd41077481b07f44d46e8d4844e5b6 100644
--- a/lib/Makefile.vc6
+++ b/lib/Makefile.vc6
@@ -73,7 +73,7 @@ LIBSSH2_PATH   = ../../libssh2-1.4.3
 !ENDIF
 
 !IFNDEF ZLIB_PATH
-ZLIB_PATH  = ../../zlib-1.2.7
+ZLIB_PATH  = ../../zlib-1.2.8
 !ENDIF
 
 !IFNDEF MACHINE
diff --git a/lib/Makefile.vxworks b/lib/Makefile.vxworks
index 0860df8e7bcb754f5abbbb1ab93c8295e6b2222b..0f9de51ed5a5d97338cc3d21727ac29ff1d6fe92 100644
--- a/lib/Makefile.vxworks
+++ b/lib/Makefile.vxworks
@@ -35,8 +35,8 @@ USER_CFLAGS:=
 # directories where to seek for includes and libraries
 OPENSSL_INC := D:/libraries/openssl/openssl-0.9.8y-vxWorks6.3/include
 OPENSSL_LIB := D:/libraries/openssl/openssl-0.9.8y-vxWorks6.3
-ZLIB_INC    := D:/libraries/zlib/zlib-1.2.7-VxWorks6.3/zlib-1.2.7
-ZLIB_LIB    := D:/libraries/zlib/zlib-1.2.7-VxWorks6.3/binaries/vxworks_3.1_gnu/Debug/lib
+ZLIB_INC    := D:/libraries/zlib/zlib-1.2.8-VxWorks6.3/zlib-1.2.8
+ZLIB_LIB    := D:/libraries/zlib/zlib-1.2.8-VxWorks6.3/binaries/vxworks_3.1_gnu/Debug/lib
 ARES_INC    :=
 ARES_LIB    :=
 
diff --git a/src/Makefile.Watcom b/src/Makefile.Watcom
index 761ceb5153e06aa1ff3cc66ca27c8fc63a973505..6b3103a35b1d1ab979e51247db8e0d7382e3b7ea 100644
--- a/src/Makefile.Watcom
+++ b/src/Makefile.Watcom
@@ -72,7 +72,7 @@ CFLAGS += -d_WIN32_WINNT=0x0501 -dENABLE_IPV6
 !ifdef %zlib_root
 ZLIB_ROOT = $(%zlib_root)
 !else
-ZLIB_ROOT = ..$(DS)..$(DS)zlib-1.2.7
+ZLIB_ROOT = ..$(DS)..$(DS)zlib-1.2.8
 !endif
 
 !ifdef %libssh2_root
diff --git a/src/Makefile.b32 b/src/Makefile.b32
index 4622868ab1cc16e319ad176cc678936990b9ab0c..092c35ad99994a5d96e3b65040253245ef0950aa 100644
--- a/src/Makefile.b32
+++ b/src/Makefile.b32
@@ -22,7 +22,7 @@ BCCDIR = $(MAKEDIR)\..
 
 # Edit the path below to point to the base of your Zlib sources.
 !ifndef ZLIB_PATH
-ZLIB_PATH = ..\..\zlib-1.2.7
+ZLIB_PATH = ..\..\zlib-1.2.8
 !endif
 
 # Edit the path below to point to the base of your OpenSSL package.
diff --git a/src/Makefile.m32 b/src/Makefile.m32
index 3dd7bd6b84cade94e223a02b02c90ec70beef9e2..b4b1b0b6063c208418da8ea1d7ab035f495705b6 100644
--- a/src/Makefile.m32
+++ b/src/Makefile.m32
@@ -7,14 +7,14 @@
 ## Example: mingw32-make -f Makefile.m32 CFG=-zlib-ssl-spi-winidn
 ##
 ## Hint: you can also set environment vars to control the build, f.e.:
-## set ZLIB_PATH=c:/zlib-1.2.7
+## set ZLIB_PATH=c:/zlib-1.2.8
 ## set ZLIB=1
 #
 ###########################################################################
 
 # Edit the path below to point to the base of your Zlib sources.
 ifndef ZLIB_PATH
-ZLIB_PATH = ../../zlib-1.2.7
+ZLIB_PATH = ../../zlib-1.2.8
 endif
 # Edit the path below to point to the base of your OpenSSL package.
 ifndef OPENSSL_PATH
diff --git a/src/Makefile.netware b/src/Makefile.netware
index 2b252c908511fb35ed36f6be0faae728a379ec6b..0ecc753b0a60c462da78edb1fbde254278b7aedb 100644
--- a/src/Makefile.netware
+++ b/src/Makefile.netware
@@ -14,7 +14,7 @@ endif
 
 # Edit the path below to point to the base of your Zlib sources.
 ifndef ZLIB_PATH
-ZLIB_PATH = ../../zlib-1.2.7
+ZLIB_PATH = ../../zlib-1.2.8
 endif
 
 # Edit the path below to point to the base of your OpenSSL package.
diff --git a/src/Makefile.vc6 b/src/Makefile.vc6
index 02665c9e24b89aa75b5865193dd69cc35b4a21f4..ada265f24b5e143b1af1a563e2f8f8368f56d989 100644
--- a/src/Makefile.vc6
+++ b/src/Makefile.vc6
@@ -60,7 +60,7 @@ OPENSSL_PATH = ../../openssl-0.9.8y
 !ENDIF
 
 !IFNDEF ZLIB_PATH
-ZLIB_PATH = ../../zlib-1.2.7
+ZLIB_PATH = ../../zlib-1.2.8
 !ENDIF
 
 !IFNDEF MACHINE