diff --git a/gemstash.gemspec b/gemstash.gemspec
index 0e7f6173..660d6fae 100644
--- a/gemstash.gemspec
+++ b/gemstash.gemspec
@@ -33,7 +33,7 @@ you push your own private gems as well."
   spec.add_runtime_dependency "faraday", "~> 0.9"
   spec.add_runtime_dependency "faraday_middleware", "~> 0.10"
   spec.add_runtime_dependency "lru_redux", "~> 1.1"
-  spec.add_runtime_dependency "puma", "~> 2.14"
+  spec.add_runtime_dependency "puma", "~> 3.10"
   spec.add_runtime_dependency "server_health_check-rack", "~> 0.1"
   spec.add_runtime_dependency "sequel", "~> 4.26"
   spec.add_runtime_dependency "sinatra", "~> 1.4"
diff --git a/spec/support/test_gemstash_server.rb b/spec/support/test_gemstash_server.rb
index 72f2a529..78c7a562 100644
--- a/spec/support/test_gemstash_server.rb
+++ b/spec/support/test_gemstash_server.rb
@@ -53,7 +53,7 @@ def start
   def stop
     return if @stopped
     @stopped = true
-    @puma_cli.halt
+    @puma_cli.launcher.stop
   end
 
   def join