diff --git a/README.md b/README.md
index af0cb383..08230442 100644
--- a/README.md
+++ b/README.md
@@ -637,6 +637,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 890. Find and Replace Pattern                                    | [Link](https://leetcode.com/problems/find-and-replace-pattern/)                                    | [Link](./lib/medium/890_find_and_replace_pattern.rb)                                    | [Link](./test/medium/test_890_find_and_replace_pattern.rb)                                    |
 | 894. All Possible Full Binary Trees                              | [Link](https://leetcode.com/problems/all-possible-full-binary-trees/)                              | [Link](./lib/medium/894_all_possible_full_binary_trees.rb)                              | [Link](./test/medium/test_894_all_possible_full_binary_trees.rb)                              |
 | 901. Online Stock Span                                           | [Link](https://leetcode.com/problems/online-stock-span/)                                           | [Link](./lib/medium/901_online_stock_span.rb)                                           | [Link](./test/medium/test_901_online_stock_span.rb)                                           |
+| 910. Smallest Range II                                           | [Link](https://leetcode.com/problems/smallest-range-ii/)                                           | [Link](./lib/medium/910_smallest_range_ii.rb)                                           | [Link](./test/medium/test_910_smallest_range_ii.rb)                                           |
 | 916. Word Subsets                                                | [Link](https://leetcode.com/problems/word-subsets/)                                                | [Link](./lib/medium/916_word_subsets.rb)                                                | [Link](./test/medium/test_916_word_subsets.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)                             |
 
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index fb204ef0..4219d82e 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 = '7.9.0'
+  s.version = '7.9.1'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/910_smallest_range_ii.rb b/lib/medium/910_smallest_range_ii.rb
new file mode 100644
index 00000000..fb88b900
--- /dev/null
+++ b/lib/medium/910_smallest_range_ii.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/smallest-range-ii/
+# @param {Integer[]} nums
+# @param {Integer} k
+# @return {Integer}
+def smallest_range_ii(nums, k)
+  nums.sort!
+  result = nums[nums.size - 1] - nums[0]
+
+  (0...(nums.size - 1)).each do |i|
+    a = nums[i]
+    b = nums[i + 1]
+    h = [nums[nums.size - 1] - k, a + k].max
+    l = [nums[0] + k, b - k].min
+
+    result = [result, h - l].min
+  end
+
+  result
+end
diff --git a/test/medium/test_910_smallest_range_ii.rb b/test/medium/test_910_smallest_range_ii.rb
new file mode 100644
index 00000000..5b469cf0
--- /dev/null
+++ b/test/medium/test_910_smallest_range_ii.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/910_smallest_range_ii'
+require 'minitest/autorun'
+
+class SmallestRangeIITest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      0,
+      smallest_range_ii(
+        [1],
+        0
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      6,
+      smallest_range_ii(
+        [0, 10],
+        2
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      3,
+      smallest_range_ii(
+        [1, 3, 6],
+        3
+      )
+    )
+  end
+end