diff --git a/README.md b/README.md
index 6444e9be..e9a4d889 100644
--- a/README.md
+++ b/README.md
@@ -651,6 +651,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 973. K Closest Points to Origin                                  | [Link](https://leetcode.com/problems/k-closest-points-to-origin/)                                  | [Link](./lib/medium/973_k_closest_points_to_origin.rb)                                  | [Link](./test/medium/test_973_k_closest_points_to_origin.rb)                                  |
 | 979. Distribute Coins in Binary Tree                             | [Link](https://leetcode.com/problems/distribute-coins-in-binary-tree/)                             | [Link](./lib/medium/979_distribute_coins_in_binary_tree.rb)                             | [Link](./test/medium/test_979_distribute_coins_in_binary_tree.rb)                             |
 | 981. Time Based Key-Value Store                                  | [Link](https://leetcode.com/problems/time-based-key-value-store/)                                  | [Link](./lib/medium/981_time_based_key_value_store.rb)                                  | [Link](./test/medium/test_981_time_based_key_value_store.rb)                                  |
+| 985. Sum of Even Numbers After Queries                           | [Link](https://leetcode.com/problems/sum-of-even-numbers-after-queries/)                           | [Link](./lib/medium/985_sum_of_even_numbers_after_queries.rb)                           | [Link](./test/medium/test_985_sum_of_even_numbers_after_queries.rb)                           |
 | 1400. Construct K Palindrome Strings                             | [Link](https://leetcode.com/problems/construct-k-palindrome-strings/)                              | [Link](./lib/medium/1400_construct_k_palindrome_strings.rb)                             | [Link](./test/medium/test_1400_construct_k_palindrome_strings.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)                                |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index 89626899..b2e7496f 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 = '8.1.8'
+  s.version = '8.1.9'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/985_sum_of_even_numbers_after_queries.rb b/lib/medium/985_sum_of_even_numbers_after_queries.rb
new file mode 100644
index 00000000..0dee7e71
--- /dev/null
+++ b/lib/medium/985_sum_of_even_numbers_after_queries.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/sum-of-even-numbers-after-queries/
+# @param {Integer[]} nums
+# @param {Integer[][]} queries
+# @return {Integer[]}
+def sum_even_after_queries(nums, queries)
+  result = ::Array.new(nums.length, 0)
+  pointer = 0
+  sum = nums.select(&:even?).sum
+
+  queries.each do |query|
+    index = query[1]
+    num = nums[index]
+
+    sum -= num if num.even?
+
+    nums[index] += query[0]
+    num = nums[index]
+
+    sum += num if num.even?
+
+    result[pointer] = sum
+    pointer += 1
+  end
+
+  result
+end
diff --git a/test/medium/test_985_sum_of_even_numbers_after_queries.rb b/test/medium/test_985_sum_of_even_numbers_after_queries.rb
new file mode 100644
index 00000000..29ab5d02
--- /dev/null
+++ b/test/medium/test_985_sum_of_even_numbers_after_queries.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/985_sum_of_even_numbers_after_queries'
+require 'minitest/autorun'
+
+class SumOfEvenNumbersAfterQueriesTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      [8, 6, 2, 4],
+      sum_even_after_queries(
+        [1, 2, 3, 4],
+        [
+          [1, 0],
+          [-3, 1],
+          [-4, 0],
+          [2, 3]
+        ]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      [0],
+      sum_even_after_queries(
+        [1],
+        [
+          [4, 0]
+        ]
+      )
+    )
+  end
+end