diff --git a/lib/fluent/config/types.rb b/lib/fluent/config/types.rb
index 75dfde385d..66ef37ad39 100644
--- a/lib/fluent/config/types.rb
+++ b/lib/fluent/config/types.rb
@@ -186,7 +186,7 @@ def self.hash_value(val, opts = {}, name = nil)
       return nil if val.nil?
 
       param = if val.is_a?(String)
-                val.start_with?('{') ? JSON.load(val) : Hash[val.strip.split(/\s*,\s*/).map{|v| v.split(':', 2)}]
+                val.start_with?('{') ? JSON.parse(val) : Hash[val.strip.split(/\s*,\s*/).map{|v| v.split(':', 2)}]
               else
                 val
               end
@@ -213,7 +213,7 @@ def self.array_value(val, opts = {}, name = nil)
       return nil if val.nil?
 
       param = if val.is_a?(String)
-                val.start_with?('[') ? JSON.load(val) : val.strip.split(/\s*,\s*/)
+                val.start_with?('[') ? JSON.parse(val) : val.strip.split(/\s*,\s*/)
               else
                 val
               end
diff --git a/lib/fluent/plugin/storage_local.rb b/lib/fluent/plugin/storage_local.rb
index 9fa88dfcb7..1ae0c6cd54 100644
--- a/lib/fluent/plugin/storage_local.rb
+++ b/lib/fluent/plugin/storage_local.rb
@@ -87,7 +87,7 @@ def configure(conf)
           if File.exist?(@path)
             raise Fluent::ConfigError, "Plugin storage path '#{@path}' is not readable/writable" unless File.readable?(@path) && File.writable?(@path)
             begin
-              data = open(@path, 'r:utf-8') { |io| io.read }
+              data = File.open(@path, 'r:utf-8') { |io| io.read }
               if data.empty?
                 log.warn "detect empty plugin storage file during startup. Ignored: #{@path}"
                 return
@@ -115,7 +115,7 @@ def load
         return if @on_memory
         return unless File.exist?(@path)
         begin
-          json_string = open(@path, 'r:utf-8'){ |io| io.read }
+          json_string = File.open(@path, 'r:utf-8'){ |io| io.read }
           json = Yajl::Parser.parse(json_string)
           unless json.is_a?(Hash)
             log.error "broken content for plugin storage (Hash required: ignored)", type: json.class
@@ -133,7 +133,7 @@ def save
         tmp_path = @path + '.tmp'
         begin
           json_string = Yajl::Encoder.encode(@store, pretty: @pretty_print)
-          open(tmp_path, 'w:utf-8', @mode) { |io| io.write json_string; io.fsync }
+          File.open(tmp_path, 'w:utf-8', @mode) { |io| io.write json_string; io.fsync }
           File.rename(tmp_path, @path)
         rescue => e
           log.error "failed to save data for plugin storage to file", path: @path, tmp: tmp_path, error: e