diff --git a/LICENCE b/LICENCE
new file mode 100644
index 0000000..c21d9d4
--- /dev/null
+++ b/LICENCE
@@ -0,0 +1,2 @@
+ Satisfactory © 2022 by Smart/Casual Ltd is licensed under CC BY-NC-SA 4.0.
+ To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/
diff --git a/satisfactory.gemspec b/satisfactory.gemspec
index 73d55bb..a8b09af 100644
--- a/satisfactory.gemspec
+++ b/satisfactory.gemspec
@@ -8,6 +8,7 @@ Gem::Specification.new do |spec|
 
   spec.summary = "A DSL for navigating your factories and building test data"
   spec.homepage = "https://github.com/SmartCasual/satisfactory"
+  spec.license = "CC-BY-NC-SA-4.0"
 
   spec.metadata["changelog_uri"] = "#{spec.homepage}/blob/v#{spec.version}/CHANGELOG.md"
   spec.metadata["homepage_uri"] = spec.homepage
@@ -16,13 +17,17 @@ Gem::Specification.new do |spec|
   spec.metadata["rubygems_mfa_required"] = "true"
   spec.required_ruby_version = ">= 3.1.0"
 
-  # Specify which files should be added to the gem when it is released.
-  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files = Dir.chdir(__dir__) do
-    `git ls-files -z`.split("\x0").reject do |f|
-      (f == __FILE__) || f.match(%r{\A(?:(?:bin|test|spec|features)/|\.(?:git|circleci))})
-    end
-  end
+  spec.files = Dir.chdir(File.expand_path(__dir__)) {
+    Dir[
+      "{bin,lib}/**/*",
+      "CHANGELOG.md",
+      "LICENCE",
+      "Rakefile",
+      "README.md",
+      "satisfactory.gemspec",
+    ]
+  }
+
   spec.bindir = "bin"
   spec.executables = spec.files.grep(%r{\Abin/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]