diff --git a/src/include/wren.h b/src/include/wren.h
index e70ef2ed..d6e58360 100644
--- a/src/include/wren.h
+++ b/src/include/wren.h
@@ -7,11 +7,11 @@
 
 // The Wren semantic version number components.
 #define WREN_VERSION_MAJOR 0
-#define WREN_VERSION_MINOR 3
+#define WREN_VERSION_MINOR 4
 #define WREN_VERSION_PATCH 0
 
 // A human-friendly string representation of the version.
-#define WREN_VERSION_STRING "0.3.0"
+#define WREN_VERSION_STRING "0.4.0"
 
 // A monotonically increasing numeric representation of the version number. Use
 // this if you want to do range checks over versions.