diff --git a/configure.ac b/configure.ac
index 3b595a4..91d783f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ([2.60])
-AC_INIT([jansson], [2.4], [petri@digip.org])
+AC_INIT([jansson], [2.5-dev], [petri@digip.org])
 
 AM_INIT_AUTOMAKE([1.10 foreign])
 
diff --git a/doc/conf.py b/doc/conf.py
index 6010904..1f667ed 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -48,7 +48,7 @@ copyright = u'2009-2012, Petri Lehtinen'
 # built documents.
 #
 # The short X.Y version.
-version = '2.4'
+version = '2.5-dev'
 # The full version, including alpha/beta/rc tags.
 release = version
 
diff --git a/src/jansson.h b/src/jansson.h
index 352c6ce..0ac9962 100644
--- a/src/jansson.h
+++ b/src/jansson.h
@@ -22,10 +22,10 @@ extern "C" {
 
 #define JANSSON_MAJOR_VERSION  2
 #define JANSSON_MINOR_VERSION  4
-#define JANSSON_MICRO_VERSION  0
+#define JANSSON_MICRO_VERSION  99
 
 /* Micro version is omitted if it's 0 */
-#define JANSSON_VERSION  "2.4"
+#define JANSSON_VERSION  "2.5-dev"
 
 /* Version as a 3-byte hex number, e.g. 0x010201 == 1.2.1. Use this
    for numeric comparisons, e.g. #if JANSSON_VERSION_HEX >= ... */