diff --git a/CHANGELOG.md b/CHANGELOG.md
index 384c42e..6bedf34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## [Unreleased]
 
+- Add `unfavorite` operation. ([#87](https://github.com/turadg/pocket-ruby/pull/87))
 - Add `favorite` operation. ([#86](https://github.com/turadg/pocket-ruby/pull/86))
 
 ## [0.4.0] - 2021-04-18
diff --git a/lib/pocket/client.rb b/lib/pocket/client.rb
index c3930e3..02db083 100644
--- a/lib/pocket/client.rb
+++ b/lib/pocket/client.rb
@@ -25,5 +25,9 @@ def retrieve params = {}
     def favorite(item_id)
       modify([action: "favorite", item_id: item_id])
     end
+
+    def unfavorite(item_id)
+      modify([action: "unfavorite", item_id: item_id])
+    end
   end
 end
diff --git a/test/pocket/client_test.rb b/test/pocket/client_test.rb
index 0710c2e..c2444ef 100644
--- a/test/pocket/client_test.rb
+++ b/test/pocket/client_test.rb
@@ -37,4 +37,23 @@ class ClientTest < Test::Unit::TestCase
 
     assert_equal success_response, result
   end
+
+  test "unfavorite" do
+    success_response = '{"action_results":[true],"status":1}'
+
+    stub_request(:post, "https://getpocket.com/v3/send")
+      .with(
+        body: "{\"actions\":[{\"action\":\"unfavorite\",\"item_id\":\"123456\"}],\"consumer_key\":null,\"access_token\":\"access_token\"}",
+        headers: {
+          "Content-Type" => "application/json",
+          "User-Agent" => "Pocket Ruby Gem #{Pocket::VERSION}"
+        }
+      )
+      .to_return(status: 200, body: success_response, headers: {})
+    client = Pocket.client(access_token: "access_token")
+
+    result = client.unfavorite("123456")
+
+    assert_equal success_response, result
+  end
 end