diff --git a/Gemfile.lock b/Gemfile.lock
index 0eb6ea5..6b1366d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -298,7 +298,7 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
-    stringio (3.0.9)
+    stringio (3.1.0)
     thor (1.3.0)
     tilt (2.3.0)
     timeout (0.4.1)