diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ecbe44f1c..593fb8fcc 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -49,6 +49,17 @@ RSpec.configure do |config|
   #   config.disable_monkey_patching!
   #   spec_helper NOTE: enabling this disables concise RSpec syntax
   config.include FactoryGirl::Syntax::Methods
+  config.around :each do |ex|
+    old = $stderr
+    $stderr = fake = StringIO.new
+    ex_file = ex.metadata[:block].source_location[0].gsub '/Users/ericboehs/Code/spreemo/chewy/', ''
+    ex_line_no = ex.metadata[:block].source_location[1]
+    ex.run
+    $stderr = old
+    if fake.string.present?
+      File.open('deprecations.txt', 'a') {|f| f.write("#{ex_file} #{ex_line_no} #{fake.string}") }
+    end
+  end

   if ENV['CI']
     # show retry status in spec process