diff --git a/Gemfile.lock b/Gemfile.lock
index 0a93e13..d4eaac5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -171,7 +171,7 @@ PATH
       json-ld-preloaded (~> 3.3)
       nokogiri (~> 1.15)
       puma (~> 6.6)
-      rack (~> 2.2)
+      rack (>= 2.2, < 4.0)
       rack-cache (~> 1.13)
       rdf (~> 3.3)
       rdf-microdata (~> 3.3)
@@ -274,7 +274,7 @@ GEM
     puma (6.6.0)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (2.2.13)
+    rack (2.2.20)
     rack-cache (1.17.0)
       rack (>= 0.4)
     rack-protection (3.2.0)
diff --git a/linter.gemspec b/linter.gemspec
old mode 100755
new mode 100644
index df78025..db2d30a
--- a/linter.gemspec
+++ b/linter.gemspec
@@ -45,7 +45,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency      'erubis',             '~> 2.7'
   gem.add_runtime_dependency      'haml',               '~> 6.1'
   gem.add_runtime_dependency      'json-ld-preloaded',  '~> 3.3'
-  gem.add_runtime_dependency      "rack",               '~> 2.2'
+  gem.add_runtime_dependency      "rack",               '>= 2.2', '< 4.0'
   gem.add_runtime_dependency      'rest-client',        '~> 2.1'
   gem.add_runtime_dependency      'rest-client-components', '~> 1.5'
   gem.add_runtime_dependency      'rack-cache',         '~> 1.13'