diff --git a/Gemfile.lock b/Gemfile.lock
index 1939fba..769ea4b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     fluent-plugin-kubernetes_metadata_filter (2.11.1)
-      fluentd (>= 0.14.0, < 1.15)
+      fluentd (>= 0.14.0, < 1.16)
       kubeclient (>= 4.0.0, < 5.0.0)
       lru_redux
 
@@ -25,28 +25,28 @@ GEM
     docile (1.4.0)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
-    escape_utils (1.2.1)
+    escape_utils (1.2.2)
     ffi (1.15.5)
     ffi-compiler (1.0.1)
       ffi (>= 1.0.0)
       rake
-    fluentd (1.14.6)
+    fluentd (1.15.0)
       bundler
       cool.io (>= 1.4.5, < 2.0.0)
       http_parser.rb (>= 0.5.1, < 0.9.0)
       msgpack (>= 1.3.1, < 2.0.0)
-      serverengine (>= 2.2.5, < 3.0.0)
+      serverengine (>= 2.3.0, < 3.0.0)
       sigdump (~> 0.2.2)
       strptime (>= 0.2.4, < 1.0.0)
       tzinfo (>= 1.0, < 3.0)
       tzinfo-data (~> 1.0)
       webrick (>= 1.4.2, < 1.8.0)
       yajl-ruby (~> 1.0)
-    github-linguist (7.17.0)
+    github-linguist (7.21.0)
       charlock_holmes (~> 0.7.7)
       escape_utils (~> 1.2.0)
       mini_mime (~> 1.0)
-      rugged (>= 0.25.1)
+      rugged (~> 1.0)
     hashdiff (1.0.1)
     http (4.4.1)
       addressable (~> 2.3)
@@ -73,38 +73,38 @@ GEM
     mime-types-data (3.2022.0105)
     mini_mime (1.1.2)
     minitest (4.7.5)
-    msgpack (1.5.2)
+    msgpack (1.5.3)
     multi_json (1.15.0)
     netrc (0.11.0)
-    parallel (1.21.0)
-    parser (3.0.2.0)
+    parallel (1.22.1)
+    parser (3.1.2.0)
       ast (~> 2.4.1)
     power_assert (2.0.1)
-    public_suffix (4.0.6)
-    rainbow (3.0.0)
+    public_suffix (4.0.7)
+    rainbow (3.1.1)
     rake (13.0.6)
     recursive-open-struct (1.1.3)
-    regexp_parser (2.1.1)
+    regexp_parser (2.5.0)
     rest-client (2.1.0)
       http-accept (>= 1.7.0, < 2.0)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
     rexml (3.2.5)
-    rr (3.0.8)
-    rubocop (1.22.3)
+    rr (3.0.9)
+    rubocop (1.28.2)
       parallel (~> 1.10)
-      parser (>= 3.0.0.0)
+      parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.12.0, < 2.0)
+      rubocop-ast (>= 1.17.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.12.0)
-      parser (>= 3.0.1.1)
+    rubocop-ast (1.17.0)
+      parser (>= 3.1.1.0)
     ruby-progressbar (1.11.0)
-    rugged (1.2.0)
+    rugged (1.4.3)
     serverengine (2.3.0)
       sigdump (~> 0.2.2)
     sigdump (0.2.4)
@@ -113,7 +113,7 @@ GEM
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
-    simplecov_json_formatter (0.1.3)
+    simplecov_json_formatter (0.1.4)
     strptime (0.2.5)
     test-unit (3.0.9)
       power_assert
@@ -127,14 +127,14 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
-    unicode-display_width (2.1.0)
+    unicode-display_width (2.2.0)
     vcr (6.0.0)
     webmock (3.14.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
     webrick (1.7.0)
-    yajl-ruby (1.4.3)
+    yajl-ruby (1.4.1)
 
 PLATFORMS
   ruby
diff --git a/fluent-plugin-kubernetes_metadata_filter.gemspec b/fluent-plugin-kubernetes_metadata_filter.gemspec
index 5f81ea7..e612b2c 100644
--- a/fluent-plugin-kubernetes_metadata_filter.gemspec
+++ b/fluent-plugin-kubernetes_metadata_filter.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
 
   gem.required_ruby_version = '>= 2.5.0'
 
-  gem.add_runtime_dependency 'fluentd', ['>= 0.14.0', '< 1.15']
+  gem.add_runtime_dependency 'fluentd', ['>= 0.14.0', '< 1.16']
   gem.add_runtime_dependency 'kubeclient', ['>= 4.0.0', '< 5.0.0']
   gem.add_runtime_dependency 'lru_redux'