diff --git a/Gemfile.lock b/Gemfile.lock
index 802b5da..df74db2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,7 +47,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.2)
-    stringio (3.0.1)
+    stringio (3.0.6)
     unicode-display_width (1.6.1)
 
 PLATFORMS