diff --git a/Gemfile.lock b/Gemfile.lock
index 6fc81e2..a5fdfa3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -74,19 +74,24 @@ GEM
       signet (>= 0.16, < 2.a)
     hashdiff (1.2.1)
     io-console (0.8.2)
-    json (2.18.1)
+    json (2.19.1)
+    json-schema (6.2.0)
+      addressable (~> 2.8)
+      bigdecimal (>= 3.1, < 5)
     jwt (3.1.2)
       base64
     language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
     logger (1.7.0)
+    mcp (0.8.0)
+      json-schema (>= 4.1)
     multi_json (1.17.0)
     multipart-post (2.4.1)
     net-http (0.9.1)
       uri (>= 0.11.1)
     os (1.1.4)
     parallel (1.27.0)
-    parser (3.3.10.1)
+    parser (3.3.10.2)
       ast (~> 2.4.1)
       racc
     prism (1.9.0)
@@ -117,10 +122,11 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.6)
-    rubocop (1.84.2)
+    rubocop (1.85.1)
       json (~> 2.3)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.1.0)
+      mcp (~> 0.6)
       parallel (~> 1.10)
       parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
diff --git a/spec/lib/mcp_client/server_resources_spec.rb b/spec/lib/mcp_client/server_resources_spec.rb
index ba91c83..7f7a40c 100644
--- a/spec/lib/mcp_client/server_resources_spec.rb
+++ b/spec/lib/mcp_client/server_resources_spec.rb
@@ -41,7 +41,7 @@
         expect(result).to be_a(Hash)
         expect(result['resources']).to be_an(Array)
         expect(result['resources'].size).to eq(2)
-        expect(result['resources'].all? { |r| r.is_a?(MCPClient::Resource) }).to be true
+        expect(result['resources'].all?(MCPClient::Resource)).to be true
         expect(result['nextCursor']).to be_nil
       end
     end