diff --git a/lib/shoulda/context.rb b/lib/shoulda/context.rb
index d3ad107..03fbd67 100644
--- a/lib/shoulda/context.rb
+++ b/lib/shoulda/context.rb
@@ -2,7 +2,6 @@
 require "shoulda/context/configuration"
 require "shoulda/context/context"
 require "shoulda/context/dsl"
-require "shoulda/context/proc_extensions"
 require "shoulda/context/test_framework_detection"
 require "shoulda/context/version"
 require "shoulda/context/world"
diff --git a/lib/shoulda/context/context.rb b/lib/shoulda/context/context.rb
index f5e1888..120cd65 100644
--- a/lib/shoulda/context/context.rb
+++ b/lib/shoulda/context/context.rb
@@ -36,12 +36,7 @@ def initialize(name, parent, &blk)
       end
 
       def merge_block(&blk)
-        if self.respond_to?(:instance_exec)
-          self.instance_exec(&blk)
-        else
-          # deprecated in Rails 4.x
-          blk.bind(self).call
-        end
+        self.instance_exec(&blk)
       end
 
       def context(name, &blk)
@@ -170,23 +165,13 @@ def run_parent_setup_blocks(binding)
 
       def run_current_setup_blocks(binding)
         setup_blocks.each do |setup_block|
-          if binding.respond_to?(:instance_exec)
-            binding.instance_exec(&setup_block)
-          else
-            # deprecated in Rails 4.x
-            setup_block.bind(binding).call
-          end
+          binding.instance_exec(&setup_block)
         end
       end
 
       def run_all_teardown_blocks(binding)
         teardown_blocks.reverse.each do |teardown_block|
-          if binding.respond_to?(:instance_exec)
-            binding.instance_exec(&teardown_block)
-          else
-            # deprecated in Rails 4.x
-            teardown_block.bind(binding).call
-          end
+          binding.instance_exec(&teardown_block)
         end
         self.parent.run_all_teardown_blocks(binding) if am_subcontext?
       end
diff --git a/lib/shoulda/context/proc_extensions.rb b/lib/shoulda/context/proc_extensions.rb
deleted file mode 100644
index 0d577df..0000000
--- a/lib/shoulda/context/proc_extensions.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-# Stolen straight from ActiveSupport
-
-class Proc #:nodoc:
-  def bind(object)
-    block, time = self, Time.now
-    (class << object; self end).class_eval do
-      method_name = "__bind_#{time.to_i}_#{time.usec}"
-      define_method(method_name, &block)
-      method = instance_method(method_name)
-      remove_method(method_name)
-      method
-    end.bind(object)
-  end
-end