Gemfile.lock in d_heap-0.4.0 vs Gemfile.lock in d_heap-0.5.0

@@ -1,9 +1,9 @@
 PATH
   remote: .
   specs:
-    d_heap (0.4.0)
+    d_heap (0.5.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.1)
@@ -12,10 +12,12 @@
     diff-lcs (1.4.4)
     method_source (1.0.0)
     parallel (1.19.2)
     parser (2.7.2.0)
       ast (~> 2.4.1)
+    perf (0.1.2)
+    priority_queue_cxx (0.3.4)
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
     rainbow (3.0.0)
     rake (13.0.3)
@@ -47,22 +49,26 @@
       unicode-display_width (>= 1.4.0, < 2.0)
     rubocop-ast (1.1.1)
       parser (>= 2.7.1.5)
     ruby-prof (1.4.2)
     ruby-progressbar (1.10.1)
+    stackprof (0.2.16)
     unicode-display_width (1.7.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   benchmark_driver
   d_heap!
+  perf
+  priority_queue_cxx
   pry
   rake (~> 13.0)
   rake-compiler
   rspec (~> 3.10)
   rubocop (~> 1.0)
   ruby-prof
+  stackprof
 
 BUNDLED WITH
    2.2.3