diff --git a/README.md b/README.md
index 9420ceee..b7cde933 100644
--- a/README.md
+++ b/README.md
@@ -728,6 +728,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 2007. Find Original Array From Doubled Array                                        | [Link](https://leetcode.com/problems/find-original-array-from-doubled-array/)                                        | [Link](./lib/medium/2007_find_original_array_from_doubled_array.rb)                                        | [Link](./test/medium/test_2007_find_original_array_from_doubled_array.rb)                                        |
 | 2023. Number of Pairs of Strings With Concatenation Equal to Target                 | [Link](https://leetcode.com/problems/number-of-pairs-of-strings-with-concatenation-equal-to-target/)                 | [Link](./lib/medium/2023_number_of_pairs_of_strings_with_concatenation_equal_to_target.rb)                 | [Link](./test/medium/test_2023_number_of_pairs_of_strings_with_concatenation_equal_to_target.rb)                 |
 | 2058. Find the Minimum and Maximum Number of Nodes Between Critical Points          | [Link](https://leetcode.com/problems/find-the-minimum-and-maximum-number-of-nodes-between-critical-points/)          | [Link](./lib/medium/2058_find_the_minimum_and_maximum_number_of_nodes_between_critical_points.rb)          | [Link](./test/medium/test_2058_find_the_minimum_and_maximum_number_of_nodes_between_critical_points.rb)          |
+| 2063. Vowels of All Substrings                                                      | [Link](https://leetcode.com/problems/vowels-of-all-substrings/)                                                      | [Link](./lib/medium/2063_vowels_of_all_substrings.rb)                                                      | [Link](./test/medium/test_2063_vowels_of_all_substrings.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 6a5b6b5e..47f6d514 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 = '8.9.4'
+  s.version = '8.9.5'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/2063_vowels_of_all_substrings.rb b/lib/medium/2063_vowels_of_all_substrings.rb
new file mode 100644
index 00000000..5f086fe6
--- /dev/null
+++ b/lib/medium/2063_vowels_of_all_substrings.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/vowels-of-all-substrings/
+# @param {String} word
+# @return {Integer}
+def count_vowels(word)
+  vowels = %w[a e i o u]
+  result = 0
+
+  word.chars.each_with_index do |char, i|
+    result += (i + 1) * (word.size - i) if vowels.include?(char.downcase)
+  end
+
+  result
+end
diff --git a/test/medium/test_2063_vowels_of_all_substrings.rb b/test/medium/test_2063_vowels_of_all_substrings.rb
new file mode 100644
index 00000000..b80ede7d
--- /dev/null
+++ b/test/medium/test_2063_vowels_of_all_substrings.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/2063_vowels_of_all_substrings'
+require 'minitest/autorun'
+
+class VowelsOfAllSubstringsTest < ::Minitest::Test
+  def test_default_one = assert_equal(6, count_vowels('aba'))
+
+  def test_default_two = assert_equal(3, count_vowels('abc'))
+
+  def test_default_three = assert_equal(0, count_vowels('ltcd'))
+end