diff --git a/doc/buildsystem.rst b/doc/buildsystem.rst
index 1143070094fc23525a08ced74fe8f91915e7d27c..7f975230cc64e605d3b77f8ef48eaf322bb69459 100644
--- a/doc/buildsystem.rst
+++ b/doc/buildsystem.rst
@@ -23,18 +23,15 @@ Building |project|
 Dependencies
 --------------------------------------------------------------------------------
 
-|project| is build on top of |ost_l|_ (|ost_s|), requiring at least version
-1.7. |ost_s| must be configured and compiled with ``ENABLE_MM=1`` to use |openmm|_.
-To create the build system, |cmake|_ is required in version
-2.8.7 or higher. |python|_ works well from version 2.7. For |ost_s| and the
-|C++| bit of |project|, |boost|_ is required in version 1.53.0 (the same as
-used for |ost_s|). Also |eigen3|_ is needed. To build
-documentation, |sphinx|_ 1.2b1 is required.
-
+|project| is build on top of |ost_l|_ (|ost_s|), requiring at least version 1.8.
+|ost_s| must be configured and compiled with ``ENABLE_MM=1`` to use |openmm|_.
+To create the build system, |cmake|_ is required. The same versions of |python|_
+and |boost|_ are needed as used in |ost_s|. For |eigen3|_ we need at least
+version 3.3.0. To build the documentation, |sphinx|_ is required.
 
 The currently preferred versions are:
 
-* |ost_s|_ 1.7
+* |ost_s|_ 1.9
 * |openmm|_ 7.1.1
 * |cmake|_ 2.8.12
 * |python|_ 2.7.5