diff --git a/Gemfile b/Gemfile
index 12e9d142932..8645810dec1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -174,14 +174,13 @@ gem 'rack-mini-profiler', require: false
 gem 'unicorn', require: false
 gem 'puma', require: false
 gem 'rbtrace', require: false, platform: :mri
+gem 'gc_tracer', require: false, platform: :mri
 
 # required for feed importing and embedding
 #
 gem 'ruby-readability', require: false
-
 gem 'simple-rss', require: false
 
-gem 'gctools', require: false, platform: :mri_21
 
 begin
   gem 'stackprof', require: false, platform: [:mri_21, :mri_22, :mri_23]
diff --git a/Gemfile.lock b/Gemfile.lock
index 2c80477ca02..6ade9231740 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -113,7 +113,7 @@ GEM
     foreman (0.82.0)
       thor (~> 0.19.1)
     fspath (2.1.1)
-    gctools (0.2.3)
+    gc_tracer (1.5.1)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
     guess_html_encoding (0.0.11)
@@ -414,7 +414,7 @@ DEPENDENCIES
   fast_xs
   flamegraph
   foreman
-  gctools
+  gc_tracer
   highline
   hiredis
   htmlentities
diff --git a/lib/middleware/unicorn_oobgc.rb b/lib/middleware/unicorn_oobgc.rb
deleted file mode 100644
index 0764b27e51e..00000000000
--- a/lib/middleware/unicorn_oobgc.rb
+++ /dev/null
@@ -1,141 +0,0 @@
-# THIS FILE IS TO BE EXTRACTED FROM DISCOURSE IT IS LICENSED UNDER THE MIT LICENSE
-#
-# The MIT License (MIT)
-#
-# Copyright (c) 2013 Discourse
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-
-# Hook into unicorn, unicorn middleware, not rack middleware
-#
-# Since we need no knowledge about the request we can simply
-#  hook unicorn
-module Middleware::UnicornOobgc
-
-  MIN_REQUESTS_PER_OOBGC = 3
-
-  # TUNE ME, for Discourse this number is good
-  MIN_FREE_SLOTS = 50_000
-
-  # The oobgc implementation is far more efficient in 2.1
-  # as we have a bunch of profiling hooks to hook it
-  # use @tmm1s implementation
-  def use_gctools?
-    if @use_gctools.nil?
-      @use_gctools =
-        if RUBY_VERSION >= "2.1.0"
-          require "gctools/oobgc"
-          true
-        else
-          false
-        end
-    end
-    @use_gctools
-  end
-
-  def verbose(msg=nil)
-    @verbose ||= ENV["OOBGC_VERBOSE"] == "1" ? :true : :false
-    if @verbose == :true
-      if(msg)
-        puts msg
-      end
-
-      true
-    end
-  end
-
-  def self.init
-    # hook up HttpServer intercept
-    ObjectSpace.each_object(Unicorn::HttpServer) do |s|
-      s.extend(self)
-    end
-  rescue
-    puts "Attempted to patch Unicorn but it is not loaded"
-  end
-
-  # the closer this is to the GC run the more accurate it is
-  def estimate_live_num_at_gc(stat)
-    stat[:heap_live_num] + stat[:heap_free_num]
-  end
-
-  def process_client(client)
-
-    if use_gctools?
-      super(client)
-      GC::OOB.run
-      return
-    end
-
-    stat = GC.stat
-
-    @num_requests ||= 0
-    @num_requests += 1
-
-    gc_count = stat[:count]
-    live_num = stat[:heap_live_num]
-
-    @expect_gc_at ||= estimate_live_num_at_gc(stat)
-
-    super(client) # Unicorn::HttpServer#process_client
-
-    # at this point client is serviced
-    stat = GC.stat
-    new_gc_count = stat[:count]
-    new_live_num = stat[:heap_live_num]
-
-    # no GC happened during the request
-    if new_gc_count == gc_count
-      delta = new_live_num - live_num
-
-      @max_delta ||= delta
-
-      if delta > @max_delta
-        new_delta = (@max_delta * 1.5).to_i
-        @max_delta = [new_delta, delta].min
-      else
-        # this may seem like a very tiny decay rate, but some apps using caching
-        # can really mess stuff up, if our delta is too low the algorithm fails
-        new_delta = (@max_delta * 0.99).to_i
-        @max_delta = [new_delta, delta].max
-      end
-
-      if @max_delta < MIN_FREE_SLOTS
-        @max_delta = MIN_FREE_SLOTS
-      end
-
-      if @num_requests > MIN_REQUESTS_PER_OOBGC && @max_delta * 2 + new_live_num > @expect_gc_at
-        t = Time.now
-        GC.start
-        stat = GC.stat
-        @expect_gc_at = estimate_live_num_at_gc(stat)
-        verbose "OobGC hit pid: #{Process.pid} req: #{@num_requests} max delta: #{@max_delta} expect at: #{@expect_gc_at} #{((Time.now - t) * 1000).to_i}ms saved"
-        @num_requests = 0
-      end
-    else
-
-      verbose "OobGC miss pid: #{Process.pid} reqs: #{@num_requests} max delta: #{@max_delta}"
-
-      @num_requests = 0
-      @expect_gc_at = estimate_live_num_at_gc(stat)
-
-    end
-
-  end
-
-end