diff --git a/generator/nanopb_generator.py b/generator/nanopb_generator.py
index 8c87ff5..520824c 100755
--- a/generator/nanopb_generator.py
+++ b/generator/nanopb_generator.py
@@ -1,7 +1,7 @@
 #!/usr/bin/python
 
 '''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
-nanopb_version = "nanopb-0.3.2"
+nanopb_version = "nanopb-0.3.3-dev"
 
 import sys
 
diff --git a/pb.h b/pb.h
index 90da623..47941eb 100644
--- a/pb.h
+++ b/pb.h
@@ -50,7 +50,7 @@
 
 /* Version of the nanopb library. Just in case you want to check it in
  * your own program. */
-#define NANOPB_VERSION nanopb-0.3.2
+#define NANOPB_VERSION nanopb-0.3.3-dev
 
 /* Include all the system headers needed by nanopb. You will need the
  * definitions of the following: