diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..0ada4d6
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,18 @@
+name: Main
+
+on:
+- push
+- pull_request
+
+jobs:
+  ci:
+    name: CI
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '3.2'
+        bundler-cache: true
+    - name: Test
+      run: bundle exec rake test
diff --git a/Gemfile.lock b/Gemfile.lock
index c218582..c762fdc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../../ruby/prism
   specs:
-    prism (0.14.0)
+    prism (0.15.1)
 
 PATH
   remote: .
@@ -14,7 +14,6 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    base64 (0.1.1)
     benchmark-ips (2.12.0)
     json (2.6.3)
     language_server-protocol (3.17.0.3)
@@ -28,8 +27,7 @@ GEM
     rake (13.0.6)
     regexp_parser (2.8.2)
     rexml (3.2.6)
-    rubocop (1.57.1)
-      base64 (~> 0.1.1)
+    rubocop (1.57.2)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
diff --git a/lib/parser/prism/compiler.rb b/lib/parser/prism/compiler.rb
index d485510..9281f54 100644
--- a/lib/parser/prism/compiler.rb
+++ b/lib/parser/prism/compiler.rb
@@ -252,28 +252,16 @@ def visit_call_node(node)
 
       # foo.bar += baz
       # ^^^^^^^^^^^^^^^
-      #
-      # foo[bar] += baz
-      # ^^^^^^^^^^^^^^^
       def visit_call_operator_write_node(node)
         builder.op_assign(
-          if node.read_name == :[]
-            builder.index(
-              visit(node.receiver),
-              token(node.opening_loc),
-              visit(node.arguments) || [],
-              token(node.closing_loc)
-            )
-          else
-            builder.call_method(
-              visit(node.receiver),
-              node.call_operator_loc ? [{ "." => :dot, "&." => :anddot, "::" => "::" }.fetch(node.call_operator), srange(node.call_operator_loc)] : nil,
-              node.message_loc ? [node.read_name, srange(node.message_loc)] : nil,
-              token(node.opening_loc),
-              visit(node.arguments) || [],
-              token(node.closing_loc)
-            )
-          end,
+          builder.call_method(
+            visit(node.receiver),
+            node.call_operator_loc ? [{ "." => :dot, "&." => :anddot, "::" => "::" }.fetch(node.call_operator), srange(node.call_operator_loc)] : nil,
+            node.message_loc ? [node.read_name, srange(node.message_loc)] : nil,
+            nil,
+            [],
+            nil
+          ),
           [node.operator_loc.slice.chomp("="), srange(node.operator_loc)],
           visit(node.value)
         )
@@ -281,16 +269,10 @@ def visit_call_operator_write_node(node)
 
       # foo.bar &&= baz
       # ^^^^^^^^^^^^^^^
-      #
-      # foo[bar] &&= baz
-      # ^^^^^^^^^^^^^^^^
       alias visit_call_and_write_node visit_call_operator_write_node
 
       # foo.bar ||= baz
       # ^^^^^^^^^^^^^^^
-      #
-      # foo[bar] ||= baz
-      # ^^^^^^^^^^^^^^^^
       alias visit_call_or_write_node visit_call_operator_write_node
 
       # foo => bar => baz
@@ -766,6 +748,32 @@ def visit_in_node(node)
         )
       end
 
+      # foo[bar] += baz
+      # ^^^^^^^^^^^^^^^
+      def visit_index_operator_write_node(node)
+        arguments = node.arguments&.arguments || []
+        arguments << node.block if node.block
+
+        builder.op_assign(
+          builder.index(
+            visit(node.receiver),
+            token(node.opening_loc),
+            visit_all(arguments),
+            token(node.closing_loc)
+          ),
+          [node.operator_loc.slice.chomp("="), srange(node.operator_loc)],
+          visit(node.value)
+        )
+      end
+
+      # foo[bar] &&= baz
+      # ^^^^^^^^^^^^^^^^
+      alias visit_index_and_write_node visit_index_operator_write_node
+
+      # foo[bar] ||= baz
+      # ^^^^^^^^^^^^^^^^
+      alias visit_index_or_write_node visit_index_operator_write_node
+
       # @foo
       # ^^^^
       def visit_instance_variable_read_node(node)