diff --git a/shard.yml b/shard.yml
index 0e4ea9f..b530050 100644
--- a/shard.yml
+++ b/shard.yml
@@ -10,7 +10,7 @@ authors:
 dependencies:
   priority-queue:
     github: spider-gazelle/priority-queue
-    branch: master
+    version: ">= 1.1.0"
 
 development_dependencies:
   ameba:
diff --git a/src/ext/priority-queue.cr b/src/ext/priority-queue.cr
deleted file mode 100644
index 712d435..0000000
--- a/src/ext/priority-queue.cr
+++ /dev/null
@@ -1,16 +0,0 @@
-require "priority-queue"
-
-module Priority
-  class Item(V)
-    def initialize(@priority : Float64, @value : V, name = nil)
-      @name = name.to_s if name
-    end
-  end
-
-  class Queue(V)
-    def push(priority : Float64, value : V, name = nil)
-      item = Item(V).new(priority, value, name)
-      push(item)
-    end
-  end
-end
diff --git a/src/kd_tree.cr b/src/kd_tree.cr
index 47814e3..3e47316 100644
--- a/src/kd_tree.cr
+++ b/src/kd_tree.cr
@@ -1,4 +1,4 @@
-require "./ext/priority-queue"
+require "priority-queue"
 require "./kd_tree/*"
 
 module Kd