diff --git a/Gemfile.lock b/Gemfile.lock
index 4383c12..de46b92 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    code_manifest (1.9.0)
+    code_manifest (1.9.1)
 
 GEM
   remote: https://rubygems.org/
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..b94f527
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Gusto
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index 80479d0..fdd8750 100644
--- a/README.md
+++ b/README.md
@@ -40,3 +40,7 @@ CodeManifest[:js].digest
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/rubyatscale/code_manifest.
+
+## License
+
+The gem is available as open source under the terms of the [MIT License](LICENSE).
diff --git a/code_manifest.gemspec b/code_manifest.gemspec
index b7e670f..81e7c2f 100644
--- a/code_manifest.gemspec
+++ b/code_manifest.gemspec
@@ -11,13 +11,14 @@ Gem::Specification.new do |spec|
   spec.summary = "A code manifest"
   spec.description = "A code manifest"
   spec.homepage = "https://github.com/rubyatscale/code_manifest"
+  spec.license = "MIT"
   spec.required_ruby_version = Gem::Requirement.new(">= 3.3")
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/rubyatscale/code_manifest"
   spec.metadata["changelog_uri"] = "https://github.com/rubyatscale/code_manifest/releases"
 
-  spec.files = Dir["README.md", "lib/**/*"]
+  spec.files = Dir["LICENSE", "README.md", "lib/**/*"]
 
   spec.add_development_dependency("rspec")
   spec.add_development_dependency("debug")
diff --git a/lib/code_manifest/version.rb b/lib/code_manifest/version.rb
index 1f105da..166e049 100644
--- a/lib/code_manifest/version.rb
+++ b/lib/code_manifest/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module CodeManifest
-  VERSION = "1.9.0"
+  VERSION = "1.9.1"
 end