diff --git a/Gemfile b/Gemfile
index 77f8086..504bc01 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ group :development do
   gem "jeweler", "~> 2.1.1"
   # Because of a dependency chain jeweler->github_api->oauth2->rack,
   # pin the version: Rack 2.0.x doesn't work on < Ruby 2.2
-  gem 'rack', '< 2.0'
+  gem 'rack', '< 3.0'
   gem "mocha", "~> 1.1.0"
   gem "test-unit", "~> 3.2.0"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 6b18067..f5806fa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,7 @@ GEM
       rack (>= 1.2, < 3)
     pkg-config (1.1.7)
     power_assert (0.3.0)
-    rack (1.6.4)
+    rack (2.1.4.1)
     rake (11.2.2)
     rdoc (4.2.2)
       json (~> 1.4)
@@ -66,7 +66,7 @@ PLATFORMS
 DEPENDENCIES
   jeweler (~> 2.1.1)
   mocha (~> 1.1.0)
-  rack (< 2.0)
+  rack (< 3.0)
   shoulda (~> 2.11.3)
   test-unit (~> 3.2.0)
 
diff --git a/gelf.gemspec b/gelf.gemspec
index 4869847..1753178 100644
--- a/gelf.gemspec
+++ b/gelf.gemspec
@@ -55,14 +55,14 @@ Gem::Specification.new do |s|
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_development_dependency(%q<shoulda>, ["~> 2.11.3"])
       s.add_development_dependency(%q<jeweler>, ["~> 2.1.1"])
-      s.add_development_dependency(%q<rack>, ["< 2.0"])
+      s.add_development_dependency(%q<rack>, "< 3.0")
       s.add_development_dependency(%q<mocha>, ["~> 1.1.0"])
       s.add_development_dependency(%q<test-unit>, ["~> 3.2.0"])
       s.add_runtime_dependency(%q<json>, [">= 0"])
     else
       s.add_dependency(%q<shoulda>, ["~> 2.11.3"])
       s.add_dependency(%q<jeweler>, ["~> 2.1.1"])
-      s.add_dependency(%q<rack>, ["< 2.0"])
+      s.add_dependency(%q<rack>, "< 3.0")
       s.add_dependency(%q<mocha>, ["~> 1.1.0"])
       s.add_dependency(%q<test-unit>, ["~> 3.2.0"])
       s.add_dependency(%q<json>, [">= 0"])
@@ -70,7 +70,7 @@ Gem::Specification.new do |s|
   else
     s.add_dependency(%q<shoulda>, ["~> 2.11.3"])
     s.add_dependency(%q<jeweler>, ["~> 2.1.1"])
-    s.add_dependency(%q<rack>, ["< 2.0"])
+    s.add_dependency(%q<rack>, "< 3.0")
     s.add_dependency(%q<mocha>, ["~> 1.1.0"])
     s.add_dependency(%q<test-unit>, ["~> 3.2.0"])
     s.add_dependency(%q<json>, [">= 0"])