diff --git a/.travis.yml b/.travis.yml
index 679141b..f665446 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,8 @@
 language: ruby
 cache: bundler
 rvm:
-  - 2.3.6
-  - 2.4.3
-  - 2.5.0
+  - 2.6.5
+  - 2.7.0
 git:
   depth: 10
 
@@ -22,7 +21,7 @@ os:
 matrix:
   include:
     - script: bundle exec rake rubocop
-      rvm: 2.5.0
+      rvm: 2.6.5
 
 env:
   -TREE_SITTER_PARSER_DIR=$TRAVIS_BUILD_DIR/test/tree-sitter/fixtures/parsers
diff --git a/ext/tree-sitter/document.c b/ext/tree-sitter/document.c
index c56ed6c..3cd9b3b 100644
--- a/ext/tree-sitter/document.c
+++ b/ext/tree-sitter/document.c
@@ -1,5 +1,11 @@
 #include "document.h"
 
+#if SIZEOF_VOIDP == SIZEOF_LONG
+# define NUM2PTR(x)   ((void*)(NUM2ULONG(x)))
+#else
+# define NUM2PTR(x)   ((void*)(NUM2ULL(x)))
+#endif
+
 VALUE rb_cDocument;
 
 /*
@@ -18,66 +24,22 @@ static VALUE rb_document_alloc(VALUE self)
 }
 
 /*
- * Public: Creates a new document
- *
- */
-VALUE rb_document_new(VALUE self, VALUE rb_input_string, VALUE rb_options)
-{
-  TSDocument *document;
-  VALUE rb_language;
-
-  Check_Type(rb_input_string, T_STRING);
-  Check_Type (rb_options, T_HASH);
-
-  rb_language = rb_hash_aref(rb_options, CSTR2SYM("language"));
-  Check_Type(rb_language, T_STRING);
-
-  Data_Get_Struct(self, TSDocument, document);
-
-  rb_document_set_language(self, rb_language);
-  rb_document_set_input_string(self, rb_input_string);
-  rb_document_parse(self);
-
-  return self;
-}
-
-
-/*
- * Public: Set the language type of a document.
+ * Private: Set the language type of a document.
  *
- * lang - A {String} identifying the language.
+ * ptr - A {Numeric} address of the function that returns the data type for treesitter.
  *
  * Returns nothing.
  */
-VALUE rb_document_set_language(VALUE self, VALUE lang)
+static VALUE rb_document_set_language(VALUE self, VALUE ptr)
 {
   TSDocument *document;
-  char *language_name;
-  void *handle;
-  char *error;
-  Check_Type(lang, T_STRING);
-
-  language_name = StringValueCStr(lang);
-
   const TSLanguage * (*language_func)();
 
-  handle = dlopen(BUNDLE_PATH, RTLD_LAZY);
-  if (!handle) {
-    rb_raise(rb_eDocumentError, "%s", dlerror());
-  }
-
-  dlerror();    /* Clear any existing error */
-
-  *(void **) (&language_func) = dlsym(handle, language_name);
-
-  if ((error = dlerror()) != NULL)  {
-    rb_raise(rb_eDocumentError, "%s", error);
-  }
-
   Data_Get_Struct(self, TSDocument, document);
 
+  language_func = NUM2PTR(ptr);
+
   ts_document_set_language(document, (*language_func)());
-  dlclose(handle);
 
   return Qnil;
 }
@@ -89,7 +51,7 @@ VALUE rb_document_set_language(VALUE self, VALUE lang)
  *
  * Returns nothing.
  */
-VALUE rb_document_set_input_string(VALUE self, VALUE rb_input_string)
+static VALUE rb_document_set_input_string(VALUE self, VALUE rb_input_string)
 {
   TSDocument *document;
   Check_Type(rb_input_string, T_STRING);
@@ -107,7 +69,7 @@ VALUE rb_document_set_input_string(VALUE self, VALUE rb_input_string)
  *
  * Returns true if successful.
  */
-VALUE rb_document_parse(VALUE self)
+static VALUE rb_document_parse(VALUE self)
 {
   TSDocument *document;
 
@@ -123,7 +85,7 @@ VALUE rb_document_parse(VALUE self)
  *
  * Returns a {Node}.
  */
-VALUE rb_document_root_node(VALUE self)
+static VALUE rb_document_root_node(VALUE self)
 {
   TSDocument *document;
 
@@ -133,16 +95,14 @@ VALUE rb_document_root_node(VALUE self)
   return rb_new_node(ts_node, document);
 }
 
-void init_document()
+void init_document(VALUE tree_sitter)
 {
-  VALUE tree_sitter = rb_define_module("TreeSitter");
-
   rb_eDocumentError = rb_define_class_under(tree_sitter, "DocumentError", rb_eStandardError);
 
   VALUE rb_cDocument = rb_define_class_under(tree_sitter, "Document", rb_cObject);
   rb_define_alloc_func(rb_cDocument, rb_document_alloc);
-  rb_define_method(rb_cDocument, "initialize", rb_document_new, 2);
-  rb_define_method(rb_cDocument, "language=", rb_document_set_language, 1);
+  rb_define_const(rb_cDocument, "BUNDLE_PATH", rb_str_new2(BUNDLE_PATH));
+  rb_define_private_method(rb_cDocument, "set_language", rb_document_set_language, 1);
   rb_define_method(rb_cDocument, "input_string=", rb_document_set_input_string, 1);
   rb_define_method(rb_cDocument, "parse", rb_document_parse, 0);
   rb_define_method(rb_cDocument, "root_node", rb_document_root_node, 0);
diff --git a/ext/tree-sitter/document.h b/ext/tree-sitter/document.h
index a0c200a..60e5fb2 100644
--- a/ext/tree-sitter/document.h
+++ b/ext/tree-sitter/document.h
@@ -2,16 +2,10 @@
 #define RB_TREE_SITTER_DOCUMENT_H
 
 #include "ruby.h"
-#include <dlfcn.h>
 #include "tree-sitter.h"
 
 static VALUE rb_eDocumentError;
 
-void init_document();
-static VALUE rb_document_alloc(VALUE self);
-VALUE rb_document_new(VALUE self, VALUE rb_str, VALUE rb_options);
-VALUE rb_document_set_language(VALUE self, VALUE lang);
-VALUE rb_document_set_input_string(VALUE self, VALUE str);
-VALUE rb_document_parse(VALUE self);
+void init_document(VALUE);
 
 #endif
diff --git a/ext/tree-sitter/node.c b/ext/tree-sitter/node.c
index 751ba1b..b739df9 100644
--- a/ext/tree-sitter/node.c
+++ b/ext/tree-sitter/node.c
@@ -3,17 +3,12 @@
 VALUE rb_cNode;
 VALUE rb_cPoint;
 
-static void rb_node_free(void *n)
-{
-  free(n);
-}
-
 VALUE rb_new_node(TSNode ts_node, TSDocument *ts_document)
 {
-  AstNode *node = malloc(sizeof(AstNode));
+  AstNode *node = xmalloc(sizeof(AstNode));
   node->ts_node = ts_node;
   node->ts_document = ts_document;
-  return Data_Wrap_Struct(rb_cNode, NULL, rb_node_free, node);
+  return Data_Wrap_Struct(rb_cNode, NULL, xfree, node);
 }
 
 /*
@@ -21,7 +16,7 @@ VALUE rb_new_node(TSNode ts_node, TSDocument *ts_document)
  *
  * Returns a {String}.
  */
-VALUE rb_node_to_s(VALUE self)
+static VALUE rb_node_to_s(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -34,7 +29,7 @@ VALUE rb_node_to_s(VALUE self)
  *
  * Returns a {String}.
  */
-VALUE rb_node_type(VALUE self)
+static VALUE rb_node_type(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -42,26 +37,21 @@ VALUE rb_node_type(VALUE self)
   return rb_str_new_cstr(ts_node_type(node->ts_node, node->ts_document));
 }
 
-void rb_point_free(void *p)
-{
-  free(p);
-}
-
 /*
  * Public: Get the starting position for a node.
  *
  * Returns a {Point}.
  */
-VALUE rb_node_start_point(VALUE self)
+static VALUE rb_node_start_point(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
 
   TSPoint start = ts_node_start_point(node->ts_node);
-  Point *point = malloc(sizeof(Point));
+  Point *point = xmalloc(sizeof(Point));
   point->ts_point = start;
 
-  return Data_Wrap_Struct(rb_cPoint, NULL, rb_point_free, point);
+  return Data_Wrap_Struct(rb_cPoint, NULL, xfree, point);
 }
 
 /*
@@ -69,17 +59,17 @@ VALUE rb_node_start_point(VALUE self)
  *
  * Returns a {Point}.
  */
-VALUE rb_node_end_point(VALUE self)
+static VALUE rb_node_end_point(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
 
   TSPoint start = ts_node_end_point(node->ts_node);
 
-  Point *point = malloc(sizeof(Point));
+  Point *point = xmalloc(sizeof(Point));
   point->ts_point = start;
 
-  return Data_Wrap_Struct(rb_cPoint, NULL, rb_point_free, point);
+  return Data_Wrap_Struct(rb_cPoint, NULL, xfree, point);
 }
 
 /*
@@ -87,7 +77,7 @@ VALUE rb_node_end_point(VALUE self)
  *
  * Returns a {Boolean}.
  */
-VALUE rb_node_is_named(VALUE self)
+static VALUE rb_node_is_named(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -100,7 +90,7 @@ VALUE rb_node_is_named(VALUE self)
  *
  * Returns an {Integer}.
  */
-VALUE rb_node_child_count(VALUE self)
+static VALUE rb_node_child_count(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -117,7 +107,7 @@ VALUE rb_node_child_count(VALUE self)
  *
  * Returns an {Integer}.
  */
-VALUE rb_node_named_child_count(VALUE self)
+static VALUE rb_node_named_child_count(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -134,7 +124,7 @@ VALUE rb_node_named_child_count(VALUE self)
  *
  * Returns a {Node} or nil.
  */
-VALUE rb_node_first_child(VALUE self)
+static VALUE rb_node_first_child(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -153,7 +143,7 @@ VALUE rb_node_first_child(VALUE self)
  *
  * Returns a {Node} or nil.
  */
-VALUE rb_node_first_named_child(VALUE self)
+static VALUE rb_node_first_named_child(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -172,7 +162,7 @@ VALUE rb_node_first_named_child(VALUE self)
  *
  * Returns a {Node} or nil.
  */
-VALUE rb_node_last_child(VALUE self)
+static VALUE rb_node_last_child(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -191,7 +181,7 @@ VALUE rb_node_last_child(VALUE self)
  *
  * Returns a {Node} or nil.
  */
-VALUE rb_node_last_named_child(VALUE self)
+static VALUE rb_node_last_named_child(VALUE self)
 {
   AstNode *node;
   Data_Get_Struct(self, AstNode, node);
@@ -210,7 +200,7 @@ VALUE rb_node_last_named_child(VALUE self)
  *
  * Returns a {Node} or nil.
  */
-VALUE rb_node_child(VALUE self, VALUE child_index)
+static VALUE rb_node_child(VALUE self, VALUE child_index)
 {
   Check_Type(child_index, T_FIXNUM);
   uint32_t i = NUM2UINT(child_index);
@@ -233,7 +223,7 @@ VALUE rb_node_child(VALUE self, VALUE child_index)
  *
  * Returns a {Node} or nil.
  */
-VALUE rb_node_named_child(VALUE self, VALUE child_index)
+static VALUE rb_node_named_child(VALUE self, VALUE child_index)
 {
   Check_Type(child_index, T_FIXNUM);
   uint32_t i = NUM2UINT(child_index);
@@ -256,7 +246,7 @@ VALUE rb_node_named_child(VALUE self, VALUE child_index)
  *
  * Returns an {Integer}.
  */
-VALUE rb_point_row(VALUE self)
+static VALUE rb_point_row(VALUE self)
 {
   Point *point;
   Data_Get_Struct(self, Point, point);
@@ -268,17 +258,15 @@ VALUE rb_point_row(VALUE self)
  *
  * Returns an {Integer}.
  */
-VALUE rb_point_column(VALUE self)
+static VALUE rb_point_column(VALUE self)
 {
   Point *point;
   Data_Get_Struct(self, Point, point);
   return UINT2NUM(point->ts_point.column);
 }
 
-void init_node()
+void init_node(VALUE tree_sitter)
 {
-  VALUE tree_sitter = rb_define_module("TreeSitter");
-
   rb_cNode = rb_define_class_under(tree_sitter, "Node", rb_cObject);
   rb_define_method(rb_cNode, "to_s", rb_node_to_s, 0);
   rb_define_method(rb_cNode, "node_type", rb_node_type, 0);
diff --git a/ext/tree-sitter/node.h b/ext/tree-sitter/node.h
index 1879abc..729ab2b 100644
--- a/ext/tree-sitter/node.h
+++ b/ext/tree-sitter/node.h
@@ -14,21 +14,8 @@ typedef struct point_type {
   TSPoint ts_point;
 } Point;
 
-void init_node();
+void init_node(VALUE);
 static void rb_node_free(void *n);
 VALUE rb_new_node(TSNode ts_node, TSDocument *ts_document);
-VALUE rb_node_to_s(VALUE self);
-VALUE rb_node_type(VALUE self);
-VALUE rb_node_start_point(VALUE self);
-VALUE rb_node_end_point(VALUE self);
-VALUE rb_node_is_named(VALUE self);
-VALUE rb_node_child_count(VALUE self);
-VALUE rb_node_named_child_count(VALUE self);
-VALUE rb_node_first_child(VALUE self);
-VALUE rb_node_first_named_child(VALUE self);
-VALUE rb_node_last_child(VALUE self);
-VALUE rb_node_last_named_child(VALUE self);
-VALUE rb_node_child(VALUE self, VALUE child_index);
-VALUE rb_node_named_child(VALUE self, VALUE child_index);
 
 #endif
diff --git a/ext/tree-sitter/tree-sitter.c b/ext/tree-sitter/tree-sitter.c
index 2c874f9..79402d2 100644
--- a/ext/tree-sitter/tree-sitter.c
+++ b/ext/tree-sitter/tree-sitter.c
@@ -4,6 +4,6 @@ __attribute__((visibility("default"))) void Init_treesitter()
 {
   VALUE tree_sitter = rb_define_module("TreeSitter");
 
-  init_document();
-  init_node();
+  init_document(tree_sitter);
+  init_node(tree_sitter);
 }
diff --git a/lib/tree-sitter.rb b/lib/tree-sitter.rb
index ec54410..ddd7742 100644
--- a/lib/tree-sitter.rb
+++ b/lib/tree-sitter.rb
@@ -4,12 +4,28 @@
 require 'tree-sitter/treesitter'
 require 'tree-sitter/version'
 require 'tree-sitter/node'
-
-begin
-  require 'awesome_print'
-  require 'pry'
-rescue LoadError; end
+require 'fiddle'
 
 module TreeSitter
+  class Document
+    def initialize(input_string, options)
+      language = options[:language]
+      self.language = language
+      self.input_string = input_string
+      self.parse
+    end
 
+    # Public: Set the language type of a document.
+    #
+    # lang - A {String} identifying the language.
+    #
+    # Returns nothing.
+    def language=(lang)
+      handle = Fiddle.dlopen BUNDLE_PATH
+      function_address = handle[lang]
+      set_language function_address
+    rescue Fiddle::DLError
+      raise TreeSitter::DocumentError
+    end
+  end
 end
diff --git a/tree-sitter.gemspec b/tree-sitter.gemspec
index 89bb7dd..79fe7aa 100644
--- a/tree-sitter.gemspec
+++ b/tree-sitter.gemspec
@@ -24,7 +24,6 @@ Gem::Specification.new do |spec|
   spec.require_paths = %w(lib ext)
 
   spec.add_development_dependency 'awesome_print'
-  spec.add_development_dependency 'bundler', '~> 1.14'
   spec.add_development_dependency 'minitest', '~> 5.0'
   spec.add_development_dependency 'minitest-focus', '~> 1.1'
   spec.add_development_dependency 'pry-byebug', '~> 3.6'