diff --git a/README.md b/README.md
index 3b83d0ca..c9fada5a 100644
--- a/README.md
+++ b/README.md
@@ -486,3 +486,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 54. Spiral Matrix                                           | [Link](https://leetcode.com/problems/spiral-matrix/)                                           | [Link](./lib/medium/54_spiral_matrix.rb)                                           |
 | 55. Jump Game                                               | [Link](https://leetcode.com/problems/jump-game/)                                               | [Link](./lib/medium/55_jump_game.rb)                                               |
 | 56. Merge Intervals                                         | [Link](https://leetcode.com/problems/merge-intervals/)                                         | [Link](./lib/medium/56_merge_intervals.rb)                                         |
+| 57. Insert Interval                                         | [Link](https://leetcode.com/problems/insert-interval/)                                         | [Link](./lib/medium/57_insert_interval.rb)                                         |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index 8c3436d5..f89b4feb 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 = '6.2.0'
+  s.version = '6.2.1'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/57_insert_interval.rb b/lib/medium/57_insert_interval.rb
new file mode 100644
index 00000000..fca3e553
--- /dev/null
+++ b/lib/medium/57_insert_interval.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/insert-interval/
+# @param {Integer[][]} intervals
+# @param {Integer[]} new_interval
+# @return {Integer[][]}
+def insert(intervals, new_interval)
+  result = []
+  n = intervals.length
+  p = 0
+
+  while p < n && intervals[p][1] < new_interval[0]
+    result << intervals[p]
+
+    p += 1
+  end
+
+  while p < n && intervals[p][0] <= new_interval[1]
+    new_interval[0] = [new_interval[0], intervals[p][0]].min
+    new_interval[1] = [new_interval[1], intervals[p][1]].max
+
+    p += 1
+  end
+
+  result << new_interval
+
+  while p < n
+    result << intervals[p]
+
+    p += 1
+  end
+
+  result
+end
diff --git a/test/medium/test_57_insert_interval.rb b/test/medium/test_57_insert_interval.rb
new file mode 100644
index 00000000..f71311a8
--- /dev/null
+++ b/test/medium/test_57_insert_interval.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/57_insert_interval'
+require 'minitest/autorun'
+
+class InsertIntervalTest < ::Minitest::Test
+  def test_default
+    assert_equal([[1, 5], [6, 9]], insert([[1, 3], [6, 9]], [2, 5]))
+    assert_equal([[1, 2], [3, 10], [12, 16]], insert([[1, 2], [3, 5], [6, 7], [8, 10], [12, 16]], [4, 8]))
+  end
+end