diff --git a/lib/temple.rb b/lib/temple.rb
index caf54e5..4312794 100644
--- a/lib/temple.rb
+++ b/lib/temple.rb
@@ -9,6 +9,8 @@ module Temple
   autoload :Filter,            'temple/filter'
   autoload :Templates,         'temple/templates'
   autoload :Grammar,           'temple/grammar'
+  autoload :ImmutableHash,     'temple/hash'
+  autoload :MutableHash,       'temple/hash'
 
   module Mixins
     autoload :Dispatcher,      'temple/mixins/dispatcher'
diff --git a/lib/temple/engine.rb b/lib/temple/engine.rb
index 4c6d135..2b041ce 100644
--- a/lib/temple/engine.rb
+++ b/lib/temple/engine.rb
@@ -57,7 +57,7 @@ def build_chain
         case filter
         when Class
           filtered_options = Hash[*option_filter.select {|k| options.include?(k) }.map {|k| [k, options[k]] }.flatten]
-          filter.new(Utils::ImmutableHash.new(local_options, filtered_options))
+          filter.new(ImmutableHash.new(local_options, filtered_options))
         when UnboundMethod
           filter.bind(self)
         else
diff --git a/lib/temple/hash.rb b/lib/temple/hash.rb
new file mode 100644
index 0000000..d666a14
--- /dev/null
+++ b/lib/temple/hash.rb
@@ -0,0 +1,44 @@
+module Temple
+  class ImmutableHash
+    include Enumerable
+
+    def initialize(*hash)
+      @hash = hash.compact
+    end
+
+    def include?(key)
+      @hash.any? {|h| h.include?(key) }
+    end
+
+    def [](key)
+      @hash.each {|h| return h[key] if h.include?(key) }
+      nil
+    end
+
+    def each
+      keys.each {|k| yield(k, self[k]) }
+    end
+
+    def keys
+      @hash.inject([]) {|keys, h| keys += h.keys }.uniq
+    end
+
+    def values
+      keys.map {|k| self[k] }
+    end
+  end
+
+  class MutableHash < ImmutableHash
+    def initialize(*hash)
+      super({}, *hash)
+    end
+
+    def []=(key, value)
+      @hash.first[key] = value
+    end
+
+    def update(hash)
+      @hash.first.update(hash)
+    end
+  end
+end
diff --git a/lib/temple/mixins/options.rb b/lib/temple/mixins/options.rb
index 06ebe4c..8f554a3 100644
--- a/lib/temple/mixins/options.rb
+++ b/lib/temple/mixins/options.rb
@@ -6,8 +6,8 @@ def set_default_options(options)
       end
 
       def default_options
-        @default_options ||= Utils::MutableHash.new(superclass.respond_to?(:default_options) ?
-                                                    superclass.default_options : nil)
+        @default_options ||= MutableHash.new(superclass.respond_to?(:default_options) ?
+                                             superclass.default_options : nil)
       end
     end
 
@@ -19,7 +19,7 @@ def self.included(base)
       attr_reader :options
 
       def initialize(options = {})
-        @options = Utils::ImmutableHash.new(options, self.class.default_options)
+        @options = ImmutableHash.new(options, self.class.default_options)
       end
     end
   end
diff --git a/lib/temple/mixins/template.rb b/lib/temple/mixins/template.rb
index 0d7c80b..53deda5 100644
--- a/lib/temple/mixins/template.rb
+++ b/lib/temple/mixins/template.rb
@@ -11,7 +11,7 @@ def engine(engine = nil)
       def build_engine(*options)
         raise 'No engine configured' unless engine
         options << default_options
-        engine.new(Utils::ImmutableHash.new(*options)) do |e|
+        engine.new(ImmutableHash.new(*options)) do |e|
           chain.each {|block| e.instance_eval(&block) }
         end
       end
diff --git a/lib/temple/utils.rb b/lib/temple/utils.rb
index 968a7f9..350eac3 100644
--- a/lib/temple/utils.rb
+++ b/lib/temple/utils.rb
@@ -2,49 +2,6 @@ module Temple
   module Utils
     extend self
 
-    class ImmutableHash
-      include Enumerable
-
-      def initialize(*hash)
-        @hash = hash.compact
-      end
-
-      def include?(key)
-        @hash.any? {|h| h.include?(key) }
-      end
-
-      def [](key)
-        @hash.each {|h| return h[key] if h.include?(key) }
-        nil
-      end
-
-      def each
-        keys.each {|k| yield(k, self[k]) }
-      end
-
-      def keys
-        @hash.inject([]) {|keys, h| keys += h.keys }.uniq
-      end
-
-      def values
-        keys.map {|k| self[k] }
-      end
-    end
-
-    class MutableHash < ImmutableHash
-      def initialize(*hash)
-        super({}, *hash)
-      end
-
-      def []=(key, value)
-        @hash.first[key] = value
-      end
-
-      def update(hash)
-        @hash.first.update(hash)
-      end
-    end
-
     # Returns an escaped copy of `html`.
     # Strings which are declared as html_safe are not escaped.
     #
diff --git a/test/test_filter.rb b/test/test_filter.rb
index 5287afd..b9a57d2 100644
--- a/test/test_filter.rb
+++ b/test/test_filter.rb
@@ -10,7 +10,7 @@ def on_test(arg)
   it 'should support options' do
     Temple::Filter.should.respond_to :default_options
     Temple::Filter.should.respond_to :set_default_options
-    Temple::Filter.new.options.should.be.instance_of Temple::Utils::ImmutableHash
+    Temple::Filter.new.options.should.be.instance_of Temple::ImmutableHash
     Temple::Filter.new(:key => 3).options[:key].should.equal 3
   end
 
diff --git a/test/test_hash.rb b/test/test_hash.rb
new file mode 100644
index 0000000..690a371
--- /dev/null
+++ b/test/test_hash.rb
@@ -0,0 +1,39 @@
+require 'helper'
+
+describe Temple::ImmutableHash do
+  it 'has read accessor' do
+    hash = Temple::ImmutableHash.new({:a => 1},{:b => 2, :a => 3})
+    hash[:a].should.equal 1
+    hash[:b].should.equal 2
+  end
+
+  it 'has include?' do
+    hash = Temple::ImmutableHash.new({:a => 1},{:b => 2, :a => 3})
+    hash.should.include :a
+    hash.should.include :b
+    hash.should.not.include :c
+  end
+
+  it 'has values' do
+    Temple::ImmutableHash.new({:a => 1},{:b => 2, :a => 3}).values.sort.should.equal [1,2]
+  end
+
+  it 'has keys' do
+    Temple::ImmutableHash.new({:a => 1},{:b => 2, :a => 3}).keys.should.equal [:a,:b]
+  end
+
+  it 'has to_a' do
+    Temple::ImmutableHash.new({:a => 1},{:b => 2, :a => 3}).to_a.should.equal [[:a, 1], [:b, 2]]
+  end
+end
+
+describe Temple::MutableHash do
+  it 'has write accessor' do
+    parent = {:a => 1}
+    hash = Temple::MutableHash.new(parent)
+    hash[:a].should.equal 1
+    hash[:a] = 2
+    hash[:a].should.equal 2
+    parent[:a].should.equal 1
+  end
+end
diff --git a/test/test_utils.rb b/test/test_utils.rb
index 9a3e293..f822ccb 100644
--- a/test/test_utils.rb
+++ b/test/test_utils.rb
@@ -37,41 +37,3 @@ class UniqueTest
     end
   end
 end
-
-describe Temple::Utils::ImmutableHash do
-  it 'has read accessor' do
-    hash = Temple::Utils::ImmutableHash.new({:a => 1},{:b => 2, :a => 3})
-    hash[:a].should.equal 1
-    hash[:b].should.equal 2
-  end
-
-  it 'has include?' do
-    hash = Temple::Utils::ImmutableHash.new({:a => 1},{:b => 2, :a => 3})
-    hash.should.include :a
-    hash.should.include :b
-    hash.should.not.include :c
-  end
-
-  it 'has values' do
-    Temple::Utils::ImmutableHash.new({:a => 1},{:b => 2, :a => 3}).values.sort.should.equal [1,2]
-  end
-
-  it 'has keys' do
-    Temple::Utils::ImmutableHash.new({:a => 1},{:b => 2, :a => 3}).keys.should.equal [:a,:b]
-  end
-
-  it 'has to_a' do
-    Temple::Utils::ImmutableHash.new({:a => 1},{:b => 2, :a => 3}).to_a.should.equal [[:a, 1], [:b, 2]]
-  end
-end
-
-describe Temple::Utils::MutableHash do
-  it 'has write accessor' do
-    parent = {:a => 1}
-    hash = Temple::Utils::MutableHash.new(parent)
-    hash[:a].should.equal 1
-    hash[:a] = 2
-    hash[:a].should.equal 2
-    parent[:a].should.equal 1
-  end
-end