https://github.com/ruby/erb/pull/95

diff --git a/lib/bogus/stubbing/not_all_expectations_satisfied.rb b/lib/bogus/stubbing/not_all_expectations_satisfied.rb
index e358beb..af67652 100644
--- a/lib/bogus/stubbing/not_all_expectations_satisfied.rb
+++ b/lib/bogus/stubbing/not_all_expectations_satisfied.rb
@@ -15,7 +15,7 @@ module Bogus
       <% end %>
       EOF
       str = str.gsub(/ {6}/, '')
-      template = ERB.new(str, nil, "<>")
+      template = ERB.new(str, trim_mode: "<>")
       new(template.result(binding))
     end