diff --git a/doc/en/install.txt b/doc/en/install.txt
index 04232a4c..3db454eb 100644
--- a/doc/en/install.txt
+++ b/doc/en/install.txt
@@ -38,7 +38,7 @@ Requirements for Unix/Linux or Mac OS X
 
 4. *Optional (speedup for i386 compatible PCs)*
    Psyco from http://psyco.sourceforge.net/
-   [http://osdn.dl.sourceforge.net/sourceforge/psyco/psyco-1.4-src.tar.gz]
+   [http://osdn.dl.sourceforge.net/sourceforge/psyco/psyco-1.5-src.tar.gz]
 
 Requirements for Windows
 ------------------------
@@ -57,7 +57,7 @@ Requirements for Windows
 
 3. *Optional (speedup for i386 compatible PCs)*
    Psyco from http://psyco.sourceforge.net/
-   [http://osdn.dl.sourceforge.net/sourceforge/psyco/psyco-1.4.win32-py2.4.exe]
+   [http://osdn.dl.sourceforge.net/sourceforge/psyco/psyco-1.5.win32-py2.4.exe]
 
 Setup for Unix/Linux or Mac OS X
 --------------------------------