diff --git a/Gemfile.lock b/Gemfile.lock
index 8f4352d9..264e4a1a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,7 +71,7 @@ GEM
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
-    stringio (3.0.1)
+    stringio (3.1.0)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     tomlrb (2.0.1)