diff --git a/Gemfile b/Gemfile
index d7e8e6b..99a4046 100644
--- a/Gemfile
+++ b/Gemfile
@@ -37,7 +37,7 @@ gem "shoryuken", "~> 7.0"
 gem "simple_command"
 gem "slack-notifier", "~> 2.3", ">= 2.3.2"
 gem "sprockets", "~> 3.7", ">= 3.7.2"
-gem "stringio", "3.0.1"
+gem "stringio", "3.0.1.1"
 gem 'next_rails'
 gem "json-canonicalization", '0.3.1'
 gem 'msgpack', "~> 1.4.4"
diff --git a/Gemfile.lock b/Gemfile.lock
index 1be98b5..163dd37 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -555,7 +555,7 @@ GEM
       base64
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    stringio (3.0.1)
+    stringio (3.0.1.1)
     sxp (2.0.0)
       matrix (~> 0.4)
       rdf (~> 3.3)
@@ -654,7 +654,7 @@ DEPENDENCIES
   spring (~> 4.2)
   spring-watcher-listen (~> 2.1)
   sprockets (~> 3.7, >= 3.7.2)
-  stringio (= 3.0.1)
+  stringio (= 3.0.1.1)
   vcr (~> 6.2)
   webmock (~> 3.1)