diff --git a/cellect-server.gemspec b/cellect-server.gemspec
index 354fbc4..dab1e71 100644
--- a/cellect-server.gemspec
+++ b/cellect-server.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'guard'
   spec.add_development_dependency 'guard-rspec'
-  spec.add_development_dependency 'puma', '~> 2.8'
+  spec.add_development_dependency 'puma', '~> 3.11'
   spec.add_development_dependency 'pg', '~> 0.17'
   spec.add_development_dependency 'connection_pool', '~> 2.0'
 
diff --git a/cellect.gemspec b/cellect.gemspec
index d556d9b..8d02b02 100644
--- a/cellect.gemspec
+++ b/cellect.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'guard'
   spec.add_development_dependency 'guard-rspec'
-  spec.add_development_dependency 'puma', '~> 2.8'
+  spec.add_development_dependency 'puma', '~> 3.11'
   spec.add_development_dependency 'pg', '~> 0.17'
   spec.add_development_dependency 'connection_pool', '~> 2.0'
   spec.add_development_dependency "simplecov"