diff --git a/Gemfile.lock b/Gemfile.lock
index 70211e5..21048a4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -299,7 +299,7 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
-    stringio (3.0.8)
+    stringio (3.0.9)
     thor (1.3.0)
     tilt (2.3.0)
     timeout (0.4.1)