diff --git a/Gemfile.lock b/Gemfile.lock
index 4917c01a1a..51b42f06d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -596,7 +596,7 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
-    stringio (3.1.0)
+    stringio (3.0.1)
     sync (0.5.0)
     sys-filesystem (1.4.4)
       ffi (~> 1.1)