diff --git a/digest-sha3.gemspec b/digest-sha3.gemspec
new file mode 100644
index 0000000..243b347
--- /dev/null
+++ b/digest-sha3.gemspec
@@ -0,0 +1,18 @@
+require File.expand_path('lib/digest/sha3/version')
+
+Gem::Specification.new do |s|
+  s.name = "digest-sha3"
+  s.version = Digest::SHA3::Version::STRING
+  s.summary = "The SHA-3 (Keccak) hash"
+  s.email = "hongli@phusion.nl"
+  s.homepage = "https://github.com/phusion/digest-sha3"
+  s.description = "The SHA-3 (Keccak) hash."
+  s.authors = ["Hongli Lai", "Keccak authors"]
+  s.extensions << "ext/digest/extconf.rb"
+
+  s.files = Dir[
+    "digest-sha3.gemspec",
+    "ext/**/*.{c,h,rb}",
+    "lib/**/*"
+  ]
+end
diff --git a/lib/digest/sha3/version.rb b/lib/digest/sha3/version.rb
new file mode 100644
index 0000000..a06d262
--- /dev/null
+++ b/lib/digest/sha3/version.rb
@@ -0,0 +1,7 @@
+module Digest
+  class SHA3
+    module Version
+      STRING = "1.0.0"
+    end
+  end
+end
\ No newline at end of file