diff --git a/Gemfile b/Gemfile
index 6e0d422e..7c68b0a4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,7 @@ gem 'image_processing'
 gem 'jwt'
 gem 'lograge'
 gem 'mysql2', require: false
+gem 'net-smtp', '0.4.0'
 gem 'oj'
 gem 'pagy'
 gem 'pg', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 8012beb0..24337766 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -326,7 +326,7 @@ GEM
     net-pop (0.1.2)
     net-protocol (0.2.2)
       timeout
-    net-smtp (0.5.0)
+    net-smtp (0.4.0)
       net-protocol
     nio4r (2.7.1)
     nokogiri (1.16.7)
@@ -591,6 +591,7 @@ DEPENDENCIES
   letter_opener_web
   lograge
   mysql2
+  net-smtp (= 0.4.0)
   oj
   pagy
   pg