diff --git a/fluent-package/Gemfile b/fluent-package/Gemfile
index 5b83ed5..9c21cb6 100644
--- a/fluent-package/Gemfile
+++ b/fluent-package/Gemfile
@@ -27,8 +27,8 @@ gem "tzinfo-data", "1.2025.2"
 
 # Fluentd v1.19.0 requires io-event 1.10.x or before.
 # The dependency condition cannot be met with async >= 2.25
-gem "async", "2.24.0"
-gem "async-http", "0.89.0"
+gem "async", "2.27.4"
+gem "async-http", "0.91.0"
 gem "webrick", "1.9.1"
 
 if ENV["INSTALL_GEM_FROM_LOCAL_REPO"]
@@ -54,7 +54,7 @@ end
 
 # plugin gems
 
-gem "elasticsearch", "8.19.0"
+gem "elasticsearch", "9.1.1"
 gem "fluent-plugin-elasticsearch", "6.0.0"
 gem "ruby-kafka", "1.5.0"
 gem "digest-murmurhash", "1.1.1"
@@ -92,7 +92,7 @@ gem "fluent-plugin-opentelemetry", "0.3.0"
 
 windows_platforms = [:mingw, :x64_mingw] # :mswin
 # ffi-win32-extensions doesn't support ffi 1.17.1 or later
-gem "ffi", "1.17.0", platforms: windows_platforms
+gem "ffi", "1.17.2", platforms: windows_platforms
 gem "ffi-win32-extensions", "1.1.0", platforms: windows_platforms
 # fiddle gem that isn't default gems as of Ruby 3.5
 gem "fiddle", "1.1.8", platforms: windows_platforms