diff --git a/README b/README
index 45698af8e..c38c12306 100644
--- a/README
+++ b/README
@@ -51,7 +51,7 @@ Important Installation Notes
 
 1)
 GTSAM requires the following libraries to be installed on your system:
- - BOOST version 1.40 or greater (install through Linux repositories or MacPorts)
+ - BOOST version 1.43 or greater (install through Linux repositories or MacPorts)
  - Cmake version 2.6 or higher
  - Support for XCode 4.3 command line tools on Mac requires CMake 2.8.8 or higher