diff --git a/doc/install.rst b/doc/install.rst
index 9098aa1cb2881514fa80d8882857eb8df784a090..b35184701835f99813ada3b72698bc6e1b30e005 100644
--- a/doc/install.rst
+++ b/doc/install.rst
@@ -28,7 +28,7 @@ with very few tools.
     Tool        Notes
     =========== ============================================
     Git         To check out the code, minimum version 2.0.
-    CMake       To set up the build, minimum version 3.9
+    CMake       To set up the build, minimum version 3.12.
     compiler    A C++14 compiler. See `compilers <install-compilers_>`_.
     =========== ============================================