diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index e621138138..c3ee8dfb1f 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -13,7 +13,7 @@
 **********************************************************************/
 
 static const char *const
-STRINGIO_VERSION = "3.1.7";
+STRINGIO_VERSION = "3.1.8";
 
 #include <stdbool.h>