diff --git a/mcp-client-ruby/Gemfile.lock b/mcp-client-ruby/Gemfile.lock
index c8b0f0af..21c8c612 100644
--- a/mcp-client-ruby/Gemfile.lock
+++ b/mcp-client-ruby/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
       hana (~> 1.3)
       regexp_parser (~> 2.0)
       simpleidn (~> 0.2)
-    mcp (1.7.0)
+    mcp (1.8.1)
       json_schemer (>= 2.4)
     regexp_parser (2.13.1)
     simpleidn (0.3.0)
diff --git a/weather-server-ruby/Gemfile.lock b/weather-server-ruby/Gemfile.lock
index f8ba4847..5857d57d 100644
--- a/weather-server-ruby/Gemfile.lock
+++ b/weather-server-ruby/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
       hana (~> 1.3)
       regexp_parser (~> 2.0)
       simpleidn (~> 0.2)
-    mcp (1.7.0)
+    mcp (1.8.1)
       json_schemer (>= 2.4)
     regexp_parser (2.13.1)
     simpleidn (0.3.0)