diff --git a/Gemfile.lock b/Gemfile.lock
index 5524ac93..0af025d9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,6 +3,7 @@ PATH
   specs:
     factory_bot (6.4.2)
       activesupport (>= 5.0.0)
+      observer
 
 GEM
   remote: https://rubygems.org/
@@ -73,6 +74,7 @@ GEM
     middleware (0.1.0)
     minitest (5.14.3)
     multi_test (0.1.2)
+    observer (0.1.2)
     parallel (1.22.1)
     parser (3.1.2.1)
       ast (~> 2.4.1)
diff --git a/factory_bot.gemspec b/factory_bot.gemspec
index aedc4f4b..e6123150 100644
--- a/factory_bot.gemspec
+++ b/factory_bot.gemspec
@@ -27,6 +27,7 @@ Gem::Specification.new do |s|
   }
 
   s.add_dependency("activesupport", ">= 5.0.0")
+  s.add_dependency("observer") if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.3')
 
   s.add_development_dependency("activerecord")
   s.add_development_dependency("appraisal")