diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index f404c1fa8ed5..2445bf304ca3 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -13,7 +13,7 @@ InternalAffairs/NodeDestructuring:
 # Offense count: 50
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 186
+  Max: 187
 
 # Offense count: 209
 # Configuration parameters: CountComments, ExcludedMethods.
diff --git a/lib/rubocop/ast/node/array_node.rb b/lib/rubocop/ast/node/array_node.rb
index 8731440e75f4..f8f2f44b46f4 100644
--- a/lib/rubocop/ast/node/array_node.rb
+++ b/lib/rubocop/ast/node/array_node.rb
@@ -18,6 +18,19 @@ def values
         each_child_node.to_a
       end
 
+      # Calls the given block for all values in the `array` literal.
+      #
+      # @yieldparam [Node] node each node
+      # @return [self] if a block is given
+      # @return [Enumerator] if no block is given
+      def each_value(&block)
+        return to_enum(__method__) unless block_given?
+
+        values.each(&block)
+
+        self
+      end
+
       # Checks whether the `array` literal is delimited by square brackets.
       #
       # @return [Boolean] whether the array is enclosed in square brackets
diff --git a/lib/rubocop/config_loader.rb b/lib/rubocop/config_loader.rb
index b1f15c287309..e9b23ffb2495 100644
--- a/lib/rubocop/config_loader.rb
+++ b/lib/rubocop/config_loader.rb
@@ -55,7 +55,10 @@ def load_file(file)
       end
 
       def add_missing_namespaces(path, hash)
-        hash.keys.each do |key|
+        # Using `hash.each_key` will cause the
+        # `can't add a new key into hash during iteration` error
+        hash_keys = hash.keys
+        hash_keys.each do |key|
           q = Cop::Cop.qualified_cop_name(key, path)
           next if q == key
 
diff --git a/lib/rubocop/cop/lint/percent_string_array.rb b/lib/rubocop/cop/lint/percent_string_array.rb
index 4e55ffd72bdf..d7cc903b1821 100644
--- a/lib/rubocop/cop/lint/percent_string_array.rb
+++ b/lib/rubocop/cop/lint/percent_string_array.rb
@@ -42,7 +42,7 @@ def on_percent_literal(node)
 
         def autocorrect(node)
           lambda do |corrector|
-            node.values.each do |value|
+            node.each_value do |value|
               range = value.loc.expression
 
               match = range.source.match(TRAILING_QUOTE)
diff --git a/spec/rubocop/ast/array_node_spec.rb b/spec/rubocop/ast/array_node_spec.rb
index a582bb61f893..128462cbf821 100644
--- a/spec/rubocop/ast/array_node_spec.rb
+++ b/spec/rubocop/ast/array_node_spec.rb
@@ -31,6 +31,24 @@
     end
   end
 
+  describe '#each_value' do
+    let(:source) { '[1, 2, 3]' }
+
+    context 'with block' do
+      it { expect(array_node.each_value {}.is_a?(described_class)).to be(true) }
+      it do
+        ret = []
+        array_node.each_value { |i| ret << i.to_s }
+
+        expect(ret).to eq(['(int 1)', '(int 2)', '(int 3)'])
+      end
+    end
+
+    context 'without block' do
+      it { expect(array_node.each_value.is_a?(Enumerator)).to be(true) }
+    end
+  end
+
   describe '#square_brackets?' do
     context 'with square brackets' do
       let(:source) { '[1, 2, 3]' }