diff --git a/ext/fiddle/lib/fiddle/version.rb b/ext/fiddle/lib/fiddle/version.rb
index a66ec20b78..ed0404c210 100644
--- a/ext/fiddle/lib/fiddle/version.rb
+++ b/ext/fiddle/lib/fiddle/version.rb
@@ -1,3 +1,3 @@
 module Fiddle
-  VERSION = "1.1.6"
+  VERSION = "1.1.7.dev"
 end
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 43cbe825aa..5c45e30950 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -13,7 +13,7 @@
 **********************************************************************/
 
 static const char *const
-STRINGIO_VERSION = "3.1.2";
+STRINGIO_VERSION = "3.1.3.dev";
 
 #include <stdbool.h>