diff --git a/configure.ac b/configure.ac
index 892ee2ae8563c89d1c3cefd6bc6f7ae49762f919..9c079b26ffad95348e1ac7c8ff8aa9fc45194dfa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,7 +4,7 @@ dnl Copyright (c) 2007-2017, The Tor Project, Inc.
 dnl See LICENSE for licensing information
 
 AC_PREREQ([2.63])
-AC_INIT([tor],[0.3.1.10])
+AC_INIT([tor],[0.3.1.10-dev])
 AC_CONFIG_SRCDIR([src/or/main.c])
 AC_CONFIG_MACRO_DIR([m4])
 
diff --git a/contrib/win32build/tor-mingw.nsi.in b/contrib/win32build/tor-mingw.nsi.in
index 72a99b7e4657dce06b9c8104df9393842492f128..7ddb21d8a7e51dbacf879b612c077a697e6907ac 100644
--- a/contrib/win32build/tor-mingw.nsi.in
+++ b/contrib/win32build/tor-mingw.nsi.in
@@ -8,7 +8,7 @@
 !include "LogicLib.nsh"
 !include "FileFunc.nsh"
 !insertmacro GetParameters
-!define VERSION "0.3.1.10"
+!define VERSION "0.3.1.10-dev"
 !define INSTALLER "tor-${VERSION}-win32.exe"
 !define WEBSITE "https://www.torproject.org/"
 !define LICENSE "LICENSE"
diff --git a/src/win32/orconfig.h b/src/win32/orconfig.h
index 5f2ef7a865bc4fd05dfa9b45a0b93ed7e8f14d19..271b018c68d8972c7627256b3dc8ad895a97a493 100644
--- a/src/win32/orconfig.h
+++ b/src/win32/orconfig.h
@@ -218,7 +218,7 @@
 #define USING_TWOS_COMPLEMENT
 
 /* Version number of package */
-#define VERSION "0.3.1.10"
+#define VERSION "0.3.1.10-dev"