diff --git a/Gemfile b/Gemfile
index 444ddd5..dad5489 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,7 +27,7 @@ gem 'whenever'
 gem 'rails', '~> 7.0.7.1'
 # Use mysql as the database for Active Record
 # ActiveRecord only works with specific versions of mysql2.
-gem 'mysql2', '~> 0.5.5'
+gem 'mysql2', '= 0.5.4'
 
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 6.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index efdaa4a..72c8b9d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -212,7 +212,7 @@ GEM
     minitest (5.20.0)
     multi_xml (0.6.0)
     mutex_m (0.2.0)
-    mysql2 (0.5.5)
+    mysql2 (0.5.4)
     namae (1.1.1)
     net-imap (0.4.9.1)
       date
@@ -444,7 +444,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails (~> 4.5.1)
   mini_racer
-  mysql2 (~> 0.5.5)
+  mysql2 (= 0.5.4)
   net-ldap
   nio4r (= 2.5.8)
   pdf-reader