diff --git a/Gemfile b/Gemfile
index 742741c..26f0c3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -74,4 +74,5 @@ gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]
 # See https://github.com/rails/rails/pull/44175
 gem 'net-http'
 gem 'uri', '0.10.0'
-gem 'strscan', '3.0.1'
\ No newline at end of file
+gem 'strscan', '3.0.1'
+gem 'stringio', '3.0.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index f96f074..4746444 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -278,7 +278,7 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.5.3)
       mini_portile2 (~> 2.8.0)
-    stringio (3.0.2)
+    stringio (3.0.1)
     strscan (3.0.1)
     thor (1.2.1)
     tilt (2.0.10)
@@ -337,6 +337,7 @@ DEPENDENCIES
   sassc-rails (~> 2.1.2)
   sdoc (~> 2.4.0)
   sqlite3 (~> 1.5.3)
+  stringio (= 3.0.1)
   strscan (= 3.0.1)
   turbolinks (~> 5.2.1)
   tzinfo-data
@@ -348,4 +349,4 @@ DEPENDENCIES
   will_paginate-bootstrap4 (~> 0.2.2)
 
 BUNDLED WITH
-   2.2.32
+   2.3.25