diff --git a/variables.h b/variables.h
index 779153c..76da715 100644
--- a/variables.h
+++ b/variables.h
@@ -17,7 +17,7 @@
 #ifndef _VARIABLES_HEADER_
 #define _VARIABLES_HEADER_
 
-#define TW_MAIN_VERSION_STR       "3.3.0"
+#define TW_MAIN_VERSION_STR       "3.3.1"
 #define TW_VERSION_STR TW_MAIN_VERSION_STR TW_DEVICE_VERSION
 
 #define TW_USE_COMPRESSION_VAR      "tw_use_compression"