diff --git a/lib/miteru/orchestrator.rb b/lib/miteru/orchestrator.rb
index ad887eb..9006ad0 100644
--- a/lib/miteru/orchestrator.rb
+++ b/lib/miteru/orchestrator.rb
@@ -40,7 +40,14 @@ def websites
             Miteru.logger.warn("Feed:#{feed.source} failed - #{result.failure}")
           end
         end
-      end.flatten
+      end.flatten.uniq(&:url)
+    end
+
+    #
+    # @return [Array<Miteru::Feeds::Base>]
+    #
+    def feeds
+      Miteru.feeds.map(&:new)
     end
 
     private
@@ -52,12 +59,5 @@ def threads
     def verbose?
       Miteru.config.verbose
     end
-
-    #
-    # @return [Array<Miteru::Feeds::Base>]
-    #
-    def feeds
-      Miteru.feeds.map(&:new)
-    end
   end
 end
diff --git a/spec/orchestrator_spec.rb b/spec/orchestrator_spec.rb
new file mode 100644
index 0000000..3469dad
--- /dev/null
+++ b/spec/orchestrator_spec.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class DummyFeed < Miteru::Feeds::Base
+  def initialize(base_url = "http://example.com")
+    super(base_url)
+  end
+
+  def urls
+    ["http://example.com"] * 10
+  end
+end
+
+RSpec.describe Miteru::Orchestrator do
+  subject(:orchestrator) { described_class.new }
+
+  before do
+    allow(orchestrator).to receive(:feeds).and_return([DummyFeed.new] * 10)
+  end
+
+  describe "#websites" do
+    it do
+      expect(orchestrator.websites.map(&:url)).to eq(["http://example.com"])
+    end
+  end
+end