diff --git a/Gemfile b/Gemfile
index ba8aff9..d9396a3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,11 +6,11 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'irb'
-gem 'rake', '~> 13.0'
+gem 'rake', '~> 13.4'
 
-gem 'rspec', '~> 3.0'
+gem 'rspec', '~> 3.13'
 
-gem 'rubocop', '~> 1.21'
+gem 'rubocop', '~> 1.88'
 gem 'rubocop-performance'
 gem 'rubocop-sorbet'
-gem 'sorbet', '~> 0.5'
+gem 'sorbet', '~> 0.6'
diff --git a/Gemfile.lock b/Gemfile.lock
index 29bee43..2dd37cc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,27 +47,34 @@ GEM
     connection_pool (2.5.0)
     constant_resolver (0.2.0)
     crass (1.0.6)
-    date (3.4.1)
-    diff-lcs (1.6.1)
+    date (3.5.1)
+    diff-lcs (1.6.2)
     drb (2.2.1)
+    erb (6.0.4)
     erubi (1.13.1)
+    hana (1.3.7)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    io-console (0.8.0)
-    irb (1.15.1)
+    io-console (0.8.2)
+    irb (1.18.0)
       pp (>= 0.6.0)
+      prism (>= 1.3.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    json (2.10.2)
-    json_rpc_handler (0.1.1)
-    language_server-protocol (3.17.0.4)
+    json (2.20.0)
+    json_schemer (2.5.0)
+      bigdecimal
+      hana (~> 1.3)
+      regexp_parser (~> 2.0)
+      simpleidn (~> 0.2)
+    language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
     logger (1.7.0)
     loofah (2.24.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
-    mcp (0.1.0)
-      json_rpc_handler (~> 0.1)
+    mcp (0.21.0)
+      json_schemer (>= 2.4)
     minitest (6.0.6)
       drb (~> 2.0)
       prism (~> 1.5)
@@ -94,18 +101,18 @@ GEM
       prism (>= 0.25.0)
       sorbet-runtime (>= 0.5.9914)
       zeitwerk (>= 2.6.1)
-    parallel (1.26.3)
+    parallel (2.1.0)
     parse_packwerk (0.26.0)
       bigdecimal
       sorbet-runtime
-    parser (3.3.7.4)
+    parser (3.3.11.1)
       ast (~> 2.4.1)
       racc
-    pp (0.6.2)
+    pp (0.6.4)
       prettyprint
     prettyprint (0.2.0)
     prism (1.9.0)
-    psych (5.2.3)
+    psych (5.4.0)
       date
       stringio
     query_packwerk (0.1.0)
@@ -124,63 +131,68 @@ GEM
       loofah (~> 2.21)
       nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
     rainbow (3.1.1)
-    rake (13.2.1)
-    rdoc (6.13.1)
+    rake (13.4.2)
+    rdoc (7.2.0)
+      erb
       psych (>= 4.0.0)
-    regexp_parser (2.10.0)
-    reline (0.6.0)
+      tsort
+    regexp_parser (2.12.0)
+    reline (0.6.3)
       io-console (~> 0.5)
-    rspec (3.13.0)
+    rspec (3.13.2)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
       rspec-mocks (~> 3.13.0)
-    rspec-core (3.13.3)
+    rspec-core (3.13.6)
       rspec-support (~> 3.13.0)
-    rspec-expectations (3.13.3)
+    rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.2)
+    rspec-mocks (3.13.8)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-support (3.13.2)
-    rubocop (1.75.1)
+    rspec-support (3.13.7)
+    rubocop (1.88.0)
       json (~> 2.3)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.1.0)
-      parallel (~> 1.10)
+      parallel (>= 1.10)
       parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 2.9.3, < 3.0)
-      rubocop-ast (>= 1.43.0, < 2.0)
+      rubocop-ast (>= 1.49.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 4.0)
-    rubocop-ast (1.43.0)
+    rubocop-ast (1.49.1)
       parser (>= 3.3.7.2)
-      prism (~> 1.4)
-    rubocop-performance (1.25.0)
+      prism (~> 1.7)
+    rubocop-performance (1.26.1)
       lint_roller (~> 1.1)
       rubocop (>= 1.75.0, < 2.0)
-      rubocop-ast (>= 1.38.0, < 2.0)
-    rubocop-sorbet (0.10.0)
-      rubocop (>= 1)
+      rubocop-ast (>= 1.47.1, < 2.0)
+    rubocop-sorbet (0.12.0)
+      lint_roller
+      rubocop (>= 1.75.2)
     ruby-progressbar (1.13.0)
     securerandom (0.4.1)
+    simpleidn (0.2.3)
     smart_properties (1.17.0)
-    sorbet (0.5.11971)
-      sorbet-static (= 0.5.11971)
-    sorbet-runtime (0.5.11971)
-    sorbet-static (0.5.11971-aarch64-linux)
-    sorbet-static (0.5.11971-universal-darwin)
-    sorbet-static (0.5.11971-x86_64-linux)
-    stringio (3.1.6)
-    thor (1.3.2)
+    sorbet (0.6.13312)
+      sorbet-static (= 0.6.13312)
+    sorbet-runtime (0.6.13312)
+    sorbet-static (0.6.13312-aarch64-linux)
+    sorbet-static (0.6.13312-universal-darwin)
+    sorbet-static (0.6.13312-x86_64-linux)
+    stringio (3.2.0)
+    thor (1.5.0)
+    tsort (0.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (3.1.4)
-      unicode-emoji (~> 4.0, >= 4.0.4)
+    unicode-display_width (3.2.0)
+      unicode-emoji (~> 4.1)
     unicode-emoji (4.2.0)
     uri (1.0.3)
-    zeitwerk (2.7.2)
+    zeitwerk (2.8.2)
 
 PLATFORMS
   aarch64-linux
@@ -196,12 +208,12 @@ PLATFORMS
 DEPENDENCIES
   chatwerk!
   irb
-  rake (~> 13.0)
-  rspec (~> 3.0)
-  rubocop (~> 1.21)
+  rake (~> 13.4)
+  rspec (~> 3.13)
+  rubocop (~> 1.88)
   rubocop-performance
   rubocop-sorbet
-  sorbet (~> 0.5)
+  sorbet (~> 0.6)
 
 BUNDLED WITH
   4.0.15
diff --git a/lib/chatwerk/tools/packages_tool.rb b/lib/chatwerk/tools/packages_tool.rb
index 7798b23..df45dba 100644
--- a/lib/chatwerk/tools/packages_tool.rb
+++ b/lib/chatwerk/tools/packages_tool.rb
@@ -17,8 +17,7 @@ class PackagesTool < MCP::Tool
             type: 'string',
             description: "A partial package path name to constrain the results (e.g. 'packs/product_services/payments/banks' or 'payments/banks')."
           }
-        },
-        required: []
+        }
       )
 
       class << self
diff --git a/lib/chatwerk/tools/print_env_tool.rb b/lib/chatwerk/tools/print_env_tool.rb
index 360ad92..b797552 100644
--- a/lib/chatwerk/tools/print_env_tool.rb
+++ b/lib/chatwerk/tools/print_env_tool.rb
@@ -10,8 +10,7 @@ class PrintEnvTool < MCP::Tool
       description 'Get the current working directory and environment path of the MCP server, ensuring correct directory context'
 
       input_schema(
-        properties: {},
-        required: []
+        properties: {}
       )
 
       class << self
diff --git a/spec/chatwerk/mcp_tools_spec.rb b/spec/chatwerk/mcp_tools_spec.rb
index c671b67..5c7029f 100644
--- a/spec/chatwerk/mcp_tools_spec.rb
+++ b/spec/chatwerk/mcp_tools_spec.rb
@@ -37,7 +37,7 @@
 
     it 'has no required arguments' do
       schema = described_class.input_schema
-      expect(schema.required).to be_empty
+      expect(schema.to_h.fetch(:required, [])).to be_empty
     end
   end
 
@@ -65,8 +65,8 @@
 
     it 'has package_path as optional argument' do
       schema = described_class.input_schema
-      expect(schema.properties).to have_key(:package_path)
-      expect(schema.required).not_to include(:package_path)
+      expect(schema.to_h[:properties]).to have_key(:package_path)
+      expect(schema.to_h.fetch(:required, [])).not_to include('package_path')
     end
   end
 
@@ -86,8 +86,8 @@
 
     it 'has package_path as required argument' do
       schema = described_class.input_schema
-      expect(schema.properties).to have_key(:package_path)
-      expect(schema.required).to include(:package_path)
+      expect(schema.to_h[:properties]).to have_key(:package_path)
+      expect(schema.to_h.fetch(:required, [])).to include('package_path')
     end
   end
 
@@ -123,10 +123,10 @@
 
     it 'has correct argument requirements' do
       schema = described_class.input_schema
-      expect(schema.properties).to have_key(:package_path)
-      expect(schema.properties).to have_key(:constant_name)
-      expect(schema.required).to include(:package_path)
-      expect(schema.required).not_to include(:constant_name)
+      expect(schema.to_h[:properties]).to have_key(:package_path)
+      expect(schema.to_h[:properties]).to have_key(:constant_name)
+      expect(schema.to_h.fetch(:required, [])).to include('package_path')
+      expect(schema.to_h.fetch(:required, [])).not_to include('constant_name')
     end
   end
 
@@ -162,10 +162,10 @@
 
     it 'has correct argument requirements' do
       schema = described_class.input_schema
-      expect(schema.properties).to have_key(:package_path)
-      expect(schema.properties).to have_key(:constant_name)
-      expect(schema.required).to include(:package_path)
-      expect(schema.required).not_to include(:constant_name)
+      expect(schema.to_h[:properties]).to have_key(:package_path)
+      expect(schema.to_h[:properties]).to have_key(:constant_name)
+      expect(schema.to_h.fetch(:required, [])).to include('package_path')
+      expect(schema.to_h.fetch(:required, [])).not_to include('constant_name')
     end
   end
 end