--- a/sinatra.gemspec
+++ b/sinatra.gemspec
@@ -45,7 +45,7 @@
 
   s.required_ruby_version = '>= 2.7.8'
 
-  s.add_dependency 'logger', '>= 1.6.0'
+  s.add_dependency 'logger', '~> 1.5'
   s.add_dependency 'mustermann', '~> 3.0'
   s.add_dependency 'rack', '>= 3.0.0', '< 4'
   s.add_dependency 'rack-protection', version
--- a/rack-protection/rack-protection.gemspec
+++ b/rack-protection/rack-protection.gemspec
@@ -40,6 +40,6 @@
 
   # dependencies
   s.add_dependency 'base64', '>= 0.1.0'
-  s.add_dependency 'logger', '>= 1.6.0'
+  s.add_dependency 'logger', '~> 1.5'
   s.add_dependency 'rack', '>= 3.0.0', '< 4'
 end