diff --git a/README.md b/README.md
index eaeeb537..22151c17 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
   <img src="https://puma.io/images/logos/puma-logo-large.png">
 </p>
 
-# Puma: A Ruby Web Server Built For Concurrency
+# Puma: A Ruby Web Server Built For Parallelism
 
 [![Actions MRI](https://github.com/puma/puma/workflows/MRI/badge.svg?branch=master)](https://github.com/puma/puma/actions?query=workflow%3AMRI)
 [![Actions non MRI](https://github.com/puma/puma/workflows/non_MRI/badge.svg?branch=master)](https://github.com/puma/puma/actions?query=workflow%3Anon_MRI)
@@ -10,11 +10,11 @@
 [![SemVer](https://api.dependabot.com/badges/compatibility_score?dependency-name=puma&package-manager=bundler&version-scheme=semver)](https://dependabot.com/compatibility-score.html?dependency-name=puma&package-manager=bundler&version-scheme=semver)
 [![StackOverflow](https://img.shields.io/badge/stackoverflow-Puma-blue.svg)]( https://stackoverflow.com/questions/tagged/puma )
 
-Puma is a **simple, fast, multi-threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications**.
+Puma is a **simple, fast, multi-threaded, and highly parallel HTTP 1.1 server for Ruby/Rack applications**.
 
 ## Built For Speed &amp; Concurrency
 
-Puma processes requests using a C-optimized Ragel extension (inherited from Mongrel) that provides fast, accurate HTTP 1.1 protocol parsing in a portable way. Puma then serves the request using a thread pool. Each request is served in a separate thread, so truly concurrent Ruby implementations (JRuby, Rubinius) will use all available CPU cores.
+Puma processes requests using a C-optimized Ragel extension (inherited from Mongrel) that provides fast, accurate HTTP 1.1 protocol parsing in a portable way. Puma then serves the request using a thread pool. Each request is served in a separate thread, so truly parallel Ruby implementations (JRuby, Rubinius) will use all available CPU cores.
 
 Originally designed as a server for [Rubinius](https://github.com/rubinius/rubinius), Puma also works well with Ruby (MRI) and JRuby.
 
diff --git a/puma.gemspec b/puma.gemspec
index 44d16608..e89a7861 100644
--- a/puma.gemspec
+++ b/puma.gemspec
@@ -4,8 +4,8 @@ Gem::Specification.new do |s|
   s.name = "puma"
   s.version = Puma::Const::PUMA_VERSION
   s.authors = ["Evan Phoenix"]
-  s.description = "Puma is a simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Puma is intended for use in both development and production environments. It's great for highly concurrent Ruby implementations such as Rubinius and JRuby as well as as providing process worker support to support CRuby well."
-  s.summary = "Puma is a simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications"
+  s.description = "Puma is a simple, fast, threaded, and highly parallel HTTP 1.1 server for Ruby/Rack applications. Puma is intended for use in both development and production environments. It's great for highly parallel Ruby implementations such as Rubinius and JRuby as well as as providing process worker support to support CRuby well."
+  s.summary = "Puma is a simple, fast, threaded, and highly parallel HTTP 1.1 server for Ruby/Rack applications"
   s.email = ["evan@phx.io"]
   s.executables = ["puma", "pumactl"]
   s.extensions = ["ext/puma_http11/extconf.rb"]