diff --git a/cellect-client.gemspec b/cellect-client.gemspec
index 70c83d7..b64702b 100644
--- a/cellect-client.gemspec
+++ b/cellect-client.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rack-test'
   spec.add_development_dependency 'pry'
 
-  spec.add_runtime_dependency 'http', '~> 0.9'
+  spec.add_runtime_dependency 'http', '>= 0.9', '< 4.0'
   spec.add_runtime_dependency 'attention', '~> 0.0.4'
   spec.add_runtime_dependency 'multi_json', '~> 1.11'
 end
diff --git a/cellect-server.gemspec b/cellect-server.gemspec
index 354fbc4..245f882 100644
--- a/cellect-server.gemspec
+++ b/cellect-server.gemspec
@@ -35,7 +35,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'diff_set', '~> 0.0.4'
   spec.add_runtime_dependency 'celluloid', '0.16.0'
-  spec.add_runtime_dependency 'http', '~> 0.6'
+  spec.add_runtime_dependency 'http', '>= 0.6', '< 4.0'
   spec.add_runtime_dependency 'attention', '~> 0.0.4'
   spec.add_runtime_dependency 'grape', '~> 0.7'
 end