diff --git a/.rubocop.yml b/.rubocop.yml
index 27f0bdc..4a05e5c 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -154,6 +154,10 @@ Style/SwapValues: # (new in 1.1)
   Enabled: true
 Style/HashConversion: # (new in 1.10)
   Enabled: true
+Style/RedundantStringEscape: # (new in 1.7)
+  Enabled: true
+  Exclude:
+    - "test/lazylead/task/svn/grep_test.rb"
 Minitest/AssertInDelta: # (new in 0.10)
   Enabled: true
 Minitest/AssertionInLifecycleHook: # (new in 0.10)
@@ -210,7 +214,7 @@ Performance/RedundantEqualityComparisonBlock: # (new in 1.10)
   Enabled: true
 Performance/RedundantSplitRegexpArgument: # (new in 1.10)
   Enabled: true
-Gemspec/DateAssignment: # (new in 1.10)
+Gemspec/DeprecatedAttributeAssignment: # (new in 1.10)
   Enabled: true
 Gemspec/RequireMFA:
   Enabled: false
\ No newline at end of file
diff --git a/lazylead.gemspec b/lazylead.gemspec
index 14d48bd..bd89cb5 100644
--- a/lazylead.gemspec
+++ b/lazylead.gemspec
@@ -28,8 +28,6 @@ lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |s|
-  s.specification_version = 2 if s.respond_to? :specification_version=
-  s.rubygems_version = "2.2"
   s.required_ruby_version = ">=2.6.5"
   s.name = "lazylead"
   s.version = "0.0.0"
@@ -93,7 +91,7 @@ tasks instead of solving technical problems."
   s.add_development_dependency "rdoc", "6.4.0"
   s.add_development_dependency "rubocop", "1.50.2"
   s.add_development_dependency "rubocop-minitest", "0.20.1"
-  s.add_development_dependency "rubocop-performance", "1.14.2"
+  s.add_development_dependency "rubocop-performance", "1.16.0"
   s.add_development_dependency "rubocop-rake", "0.6.0"
   s.add_development_dependency "rubocop-rspec", "2.11.1"
   s.add_development_dependency "ruby-prof", "1.4.3"
diff --git a/lib/lazylead/cli/app.rb b/lib/lazylead/cli/app.rb
index b85f130..d3b4ed1 100644
--- a/lib/lazylead/cli/app.rb
+++ b/lib/lazylead/cli/app.rb
@@ -59,7 +59,7 @@ def run(opts)
       def apply_vcs_migration(opts)
         @db = "#{File.expand_path(opts[:home])}/#{opts[:sqlite]}"
         vcs = "#{File.expand_path(opts[:home])}/#{opts[:vcs4sql]}"
-        @log.debug "Database: '#{@db.colorize(:light_blue)}', "\
+        @log.debug "Database: '#{@db.colorize(:light_blue)}', " \
                    "sql migration dir: '#{vcs.colorize(:light_blue)}'"
         Vcs4sql::Sqlite::Migration.new(@db).upgrade vcs, opts[:testdata]
         @log.debug "Migration applied to '#{@db.colorize(:light_blue)}' from " \
diff --git a/lib/lazylead/exchange.rb b/lib/lazylead/exchange.rb
index a60101d..ae71b4c 100644
--- a/lib/lazylead/exchange.rb
+++ b/lib/lazylead/exchange.rb
@@ -51,8 +51,8 @@ def initialize(
     # :opts   :: the mail configuration like from, cc, subject, template.
     def send(opts)
       if opts.msg_to.empty?
-        @log.warn "ll-012: Email can't be sent to '#{opts.msg_to}," \
-                  " more: '#{opts}'"
+        @log.warn "ll-012: Email can't be sent to '#{opts.msg_to}, " \
+                  "more: '#{opts}'"
       else
         msg = make_msg opts
         cli.send_message msg
diff --git a/lib/lazylead/postman.rb b/lib/lazylead/postman.rb
index 18db779..753dfb5 100644
--- a/lib/lazylead/postman.rb
+++ b/lib/lazylead/postman.rb
@@ -54,8 +54,8 @@ def initialize(log = Log.new)
     # :opts   :: the mail configuration like to, from, cc, subject, template.
     def send(opts)
       if opts.msg_to.empty?
-        @log.warn "ll-013: Email can't be sent to '#{opts.msg_to}," \
-                  " more: '#{opts}'"
+        @log.warn "ll-013: Email can't be sent to '#{opts.msg_to}, " \
+                  "more: '#{opts}'"
       else
         mail = make_email(opts)
         mail.deliver
diff --git a/lib/lazylead/system/jira.rb b/lib/lazylead/system/jira.rb
index 380e929..20430b0 100644
--- a/lib/lazylead/system/jira.rb
+++ b/lib/lazylead/system/jira.rb
@@ -47,8 +47,8 @@ def initialize(opts, salt = NoSalt.new, log = Log.new)
       @salt = salt
       @log = log
       @log.debug "Initiate a Jira client using following opts: " \
-                 "#{@opts.except 'password', :password} " \
-                 " and salt #{@salt.id} (found=#{@salt.specified?})"
+                 "#{@opts.except 'password', :password}  " \
+                 "and salt #{@salt.id} (found=#{@salt.specified?})"
     end
 
     # Find the jira issues by 'JQL'
diff --git a/lib/lazylead/task/accuracy/accuracy.rb b/lib/lazylead/task/accuracy/accuracy.rb
index 932d131..4f7dbb8 100644
--- a/lib/lazylead/task/accuracy/accuracy.rb
+++ b/lib/lazylead/task/accuracy/accuracy.rb
@@ -98,8 +98,8 @@ def comment
       comment = [
         "Hi [~#{reporter}],",
         "",
-        "The triage accuracy is '{color:#{color}}#{@score}{color}'" \
-        " (~{color:#{color}}#{@accuracy}%{color}), here are the reasons why:",
+        "The triage accuracy is '{color:#{color}}#{@score}{color}' " \
+        "(~{color:#{color}}#{@accuracy}%{color}), here are the reasons why:",
         "|| Ticket requirement || Status || Field ||"
       ]
       @opts[:rules].each do |r|
diff --git a/lib/lazylead/task/accuracy/stacktrace.rb b/lib/lazylead/task/accuracy/stacktrace.rb
index b0e0905..12f5dd9 100644
--- a/lib/lazylead/task/accuracy/stacktrace.rb
+++ b/lib/lazylead/task/accuracy/stacktrace.rb
@@ -78,7 +78,7 @@ def pairs(words, text)
       words.each_with_index do |e, i|
         next unless e.start_with? text
         pair = snippets.last
-        pair << i if pair.size.zero? || pair.size == 1
+        pair << i if pair.empty? || pair.size == 1
         snippets[-1] = pair
         snippets << [] if pair.size == 2
       end