diff --git a/Gemfile.lock b/Gemfile.lock
index 874d2bb..5213fd3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
-    stringio (3.0.1)
+    stringio (3.1.0)
 
 PLATFORMS
   ruby