diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88e37821..8e472d79 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # Clixon Changelog
 
+## 3.6.0 (Upcoming)
+
 ## 3.5.0 (12 February 2018)
 
 ### Major changes:
diff --git a/configure b/configure
index 6701990d..44813e8a 100755
--- a/configure
+++ b/configure
@@ -2150,9 +2150,9 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 : ${CFLAGS="-O2"}
 
 CLIXON_VERSION_MAJOR="3"
-CLIXON_VERSION_MINOR="5"
+CLIXON_VERSION_MINOR="6"
 CLIXON_VERSION_PATCH="0"
-CLIXON_VERSION="\"${CLIXON_VERSION_MAJOR}.${CLIXON_VERSION_MINOR}.${CLIXON_VERSION_PATCH}\""
+CLIXON_VERSION="\"${CLIXON_VERSION_MAJOR}.${CLIXON_VERSION_MINOR}.${CLIXON_VERSION_PATCH}.PRE\""
 # Fix to specific version (eg 3.5) or head (3)
 CLIGEN_VERSION="3"
 if test "$prefix" = "NONE"; then
diff --git a/configure.ac b/configure.ac
index 7b396216..b0bbed2f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,9 +42,9 @@ AC_INIT(lib/clixon/clixon.h.in)
 : ${CFLAGS="-O2"}
 
 CLIXON_VERSION_MAJOR="3"
-CLIXON_VERSION_MINOR="5"
+CLIXON_VERSION_MINOR="6"
 CLIXON_VERSION_PATCH="0"
-CLIXON_VERSION="\"${CLIXON_VERSION_MAJOR}.${CLIXON_VERSION_MINOR}.${CLIXON_VERSION_PATCH}\""
+CLIXON_VERSION="\"${CLIXON_VERSION_MAJOR}.${CLIXON_VERSION_MINOR}.${CLIXON_VERSION_PATCH}.PRE\""
 # Fix to specific version (eg 3.5) or head (3) 
 CLIGEN_VERSION="3" 
 if test "$prefix" = "NONE"; then