diff --git a/spec/provider/heroku_api_spec.rb b/spec/provider/heroku_api_spec.rb
index ed56e3c3a..ab39547a9 100644
--- a/spec/provider/heroku_api_spec.rb
+++ b/spec/provider/heroku_api_spec.rb
@@ -8,7 +8,7 @@
   end
 
   let(:expected_headers) do
-    { "User-Agent" => "dpl/#{DPL::VERSION} heroku-rb/#{Heroku::API::VERSION}" }
+    { "User-Agent" => "dpl/#{DPL::VERSION} heroku-rb/#{Heroku::API::VERSION}", "Accept" => "application/vnd.heroku+json; version=3" }
   end
 
   describe "#ssh" do
diff --git a/spec/provider/heroku_git_spec.rb b/spec/provider/heroku_git_spec.rb
index 336c80951..19032571a 100644
--- a/spec/provider/heroku_git_spec.rb
+++ b/spec/provider/heroku_git_spec.rb
@@ -8,7 +8,7 @@
   end
 
   let(:expected_headers) do
-    { "User-Agent" => "dpl/#{DPL::VERSION} heroku-rb/#{Heroku::API::VERSION}" }
+    { "User-Agent" => "dpl/#{DPL::VERSION} heroku-rb/#{Heroku::API::VERSION}", "Accept" => "application/vnd.heroku+json; version=3" }
   end
 
   describe "#api" do