diff --git a/buildtools/version.py b/buildtools/version.py
index b34c7b66..eb6732d2 100644
--- a/buildtools/version.py
+++ b/buildtools/version.py
@@ -62,5 +62,5 @@ VER_FLAGS        = "a1"     # wxPython release flags
 # The version numbers of wxWidgets to be used in the build
 wxVER_MAJOR        = 3
 wxVER_MINOR        = 1
-wxVER_RELEASE      = 3  # only used when wxVER_MINOR is an odd value
+wxVER_RELEASE      = 4  # only used when wxVER_MINOR is an odd value