diff --git a/README.md b/README.md
index c142d903..e5592656 100644
--- a/README.md
+++ b/README.md
@@ -696,6 +696,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1442. Count Triplets That Can Form Two Arrays of Equal XOR                          | [Link](https://leetcode.com/problems/count-triplets-that-can-form-two-arrays-of-equal-xor/)                          | [Link](./lib/medium/1442_count_triplets_that_can_form_two_arrays_of_equal_xor.rb)                          | [Link](./test/medium/test_1442_count_triplets_that_can_form_two_arrays_of_equal_xor.rb)                          |
 | 1448. Count Good Nodes in Binary Tree                                               | [Link](https://leetcode.com/problems/count-good-nodes-in-binary-tree/)                                               | [Link](./lib/medium/1448_count_good_nodes_in_binary_tree.rb)                                               | [Link](./test/medium/test_1448_count_good_nodes_in_binary_tree.rb)                                               |
 | 1457. Pseudo-Palindromic Paths in a Binary Tree                                     | [Link](https://leetcode.com/problems/pseudo-palindromic-paths-in-a-binary-tree/)                                     | [Link](./lib/medium/1457_pseudo_palindromic_paths_in_a_binary_tree.rb)                                     | [Link](./test/medium/test_1457_pseudo_palindromic_paths_in_a_binary_tree.rb)                                     |
+| 1461. Check If a String Contains All Binary Codes of Size K                         | [Link](https://leetcode.com/problems/check-if-a-string-contains-all-binary-codes-of-size-k/)                         | [Link](./lib/medium/1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb)                         | [Link](./test/medium/test_1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb)                         |
 | 2116. Check if a Parentheses String Can Be Valid                                    | [Link](https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/)                                    | [Link](./lib/medium/2116_check_if_a_parentheses_string_can_be_valid.rb)                                    | [Link](./test/medium/test_2116_check_if_a_parentheses_string_can_be_valid.rb)                                    |
 | 2425. Bitwise XOR of All Pairings                                                   | [Link](https://leetcode.com/problems/bitwise-xor-of-all-pairings/)                                                   | [Link](./lib/medium/2425_bitwise_xor_of_all_pairings.rb)                                                   | [Link](./test/medium/test_2425_bitwise_xor_of_all_pairings.rb)                                                   |
 | 2429. Minimize XOR                                                                  | [Link](https://leetcode.com/problems/minimize-xor/)                                                                  | [Link](./lib/medium/2429_minimize_xor.rb)                                                                  | [Link](./test/medium/test_2429_minimize_xor.rb)                                                                  |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index 4067ef3b..0fbfed59 100644
--- a/leetcode-ruby.gemspec
+++ b/leetcode-ruby.gemspec
@@ -5,7 +5,7 @@ require 'English'
 ::Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.0'
   s.name = 'leetcode-ruby'
-  s.version = '8.6.2'
+  s.version = '8.6.3'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb b/lib/medium/1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb
new file mode 100644
index 00000000..3fb46a33
--- /dev/null
+++ b/lib/medium/1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/check-if-a-string-contains-all-binary-codes-of-size-k/
+# @param {String} s
+# @param {Integer} k
+# @return {Boolean}
+def has_all_codes(s, k)
+  need = 1 << k
+  exists = ::Set.new
+
+  (k..s.size).each do |i|
+    str = s[i - k...i]
+
+    next if exists.include?(str)
+
+    exists << str
+    need -= 1
+
+    return true if need.zero?
+  end
+
+  false
+end
diff --git a/test/medium/test_1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb b/test/medium/test_1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb
new file mode 100644
index 00000000..ed499d47
--- /dev/null
+++ b/test/medium/test_1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1461_check_if_a_string_contains_all_binary_codes_of_size_k'
+require 'minitest/autorun'
+
+class CheckIfAStringContainsAllBinaryCodesOfSizeKTest < ::Minitest::Test
+  def test_default_one = assert(has_all_codes('00110110', 2))
+
+  def test_default_two = assert(has_all_codes('0110', 1))
+
+  def test_default_three = assert(!has_all_codes('0110', 2))
+end