diff --git a/Doc/lib/libzlib.tex b/Doc/lib/libzlib.tex
index b0bc881c756..10178da1463 100644
--- a/Doc/lib/libzlib.tex
+++ b/Doc/lib/libzlib.tex
@@ -9,8 +9,8 @@
 For applications that require data compression, the functions in this
 module allow compression and decompression, using the zlib library.
 The zlib library has its own home page at
-\url{http://www.gzip.org/zlib/}.  Version 1.1.3 is the
-most recent version as of September 2000; use a later version if one
+\url{http://www.gzip.org/zlib/}.  Version 1.2.1 is the
+most recent version as of October 2004; use a later version if one
 is available.  There are known incompatibilities between the Python
 module and earlier versions of the zlib library.