diff --git a/lib/x/client_defaults.rb b/lib/x/client_defaults.rb
index b55eaa6..383939e 100644
--- a/lib/x/client_defaults.rb
+++ b/lib/x/client_defaults.rb
@@ -8,6 +8,6 @@ module ClientDefaults
     DEFAULT_OBJECT_CLASS = Hash
     DEFAULT_OPEN_TIMEOUT = 60 # seconds
     DEFAULT_READ_TIMEOUT = 60 # seconds
-    DEFAULT_USER_AGENT = "X-Client/#{Version} Ruby/#{RUBY_VERSION}".freeze
+    DEFAULT_USER_AGENT = "X-Client/#{VERSION} Ruby/#{RUBY_VERSION}".freeze
   end
 end
diff --git a/lib/x/version.rb b/lib/x/version.rb
index c312316..32d5bf7 100644
--- a/lib/x/version.rb
+++ b/lib/x/version.rb
@@ -1,39 +1,5 @@
-module X
-  # The version of this library
-  module Version
-    module_function
-
-    def major
-      0
-    end
-
-    def minor
-      4
-    end
-
-    def patch
-      0
-    end
+require "rubygems/version"
 
-    def pre
-      nil
-    end
-
-    def to_h
-      {
-        major: major,
-        minor: minor,
-        patch: patch,
-        pre: pre
-      }
-    end
-
-    def to_a
-      [major, minor, patch, pre].compact
-    end
-
-    def to_s
-      to_a.join(".")
-    end
-  end
+module X
+  VERSION = Gem::Version.create("0.4.0")
 end
diff --git a/test/x/test_version.rb b/test/x/test_version.rb
index ab79342..a8278e0 100644
--- a/test/x/test_version.rb
+++ b/test/x/test_version.rb
@@ -1,32 +1,28 @@
 require "test_helper"
 
-# Tests for X::Version module
+# Tests for X::VERSION module
 class VersionTest < Minitest::Test
-  def test_major_version
-    refute_nil X::Version.major
+  def test_that_it_has_a_version_number
+    refute_nil ::X::VERSION
   end
 
-  def test_minor_version
-    refute_nil X::Version.minor
+  def test_segments_array
+    assert_kind_of Array, X::VERSION.segments
   end
 
-  def test_patch_version
-    refute_nil X::Version.patch
+  def test_major_version_integer
+    assert_kind_of Integer, X::VERSION.segments[0]
   end
 
-  def test_to_h
-    assert_kind_of Hash, X::Version.to_h
+  def test_minor_version_integer
+    assert_kind_of Integer, X::VERSION.segments[1]
   end
 
-  def test_to_a
-    assert_kind_of Array, X::Version.to_a
+  def test_patch_version_integer
+    assert_kind_of Integer, X::VERSION.segments[2]
   end
 
   def test_to_s
-    assert_kind_of String, X::Version.to_s
-  end
-
-  def test_that_it_has_a_version_number
-    refute_nil ::X::Version
+    assert_kind_of String, X::VERSION.to_s
   end
 end
diff --git a/x.gemspec b/x.gemspec
index ae22670..d13687a 100644
--- a/x.gemspec
+++ b/x.gemspec
@@ -2,7 +2,7 @@ require_relative "lib/x/version"
 
 Gem::Specification.new do |spec|
   spec.name = "x"
-  spec.version = X::Version
+  spec.version = X::VERSION
   spec.authors = ["Erik Berlin"]
   spec.email = ["sferik@gmail.com"]