diff --git a/.circleci/config.yml b/.circleci/config.yml
index f08618a..8eeb046 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -11,6 +11,7 @@ jobs:
       - run: |
           apk add libc-dev gcc make git sqlite sqlite-dev sqlite-libs
           bundler install
+      - run: rubocop -A
       - run: bundle exec rake test rubocop sqlint xcop
   deploy:
     machine: true
diff --git a/.rultor.yml b/.rultor.yml
index dc328b1..953b4c0 100755
--- a/.rultor.yml
+++ b/.rultor.yml
@@ -16,6 +16,7 @@ release:
     sed -i "s/0\.0\.0/${tag}/g" lib/lazylead/version.rb
     sed -i "s/0\.0\.0/${tag}/g" lazylead.gemspec
     bundle install --no-color
+    rubocop -A
     bundle exec rake --trace test rubocop sqlint xcop
     git add lib/lazylead/version.rb lazylead.gemspec
     git commit -m "version set to ${tag}"
@@ -28,4 +29,5 @@ merge:
   squash: true
   script: |-
     bundle install
+    rubocop -A
     bundle exec rake test rubocop sqlint xcop
diff --git a/lib/lazylead/task/echo.rb b/lib/lazylead/task/echo.rb
index a02db93..fed310f 100644
--- a/lib/lazylead/task/echo.rb
+++ b/lib/lazylead/task/echo.rb
@@ -53,7 +53,7 @@ def initialize(log = Log.new, path = "test/resources/echo.txt")
       end
 
       def run(_, _, _)
-        File.open(@path, "w") { |f| f.write Time.now }
+        File.write(@path, Time.now)
       end
     end
   end
diff --git a/lib/lazylead/task/loading.rb b/lib/lazylead/task/loading.rb
index 57207e9..9aa31fe 100644
--- a/lib/lazylead/task/loading.rb
+++ b/lib/lazylead/task/loading.rb
@@ -38,8 +38,7 @@ def initialize(log = Log.new)
       def run(sys, postman, opts)
         assignments = sys.issues(opts["jql"], opts.jira_defaults)
                          .group_by(&:assignee)
-                         .map { |user, tasks| [user.id, Teammate.new(user, tasks)] }
-                         .to_h
+                         .to_h { |user, tasks| [user.id, Teammate.new(user, tasks)] }
         opts.slice("team", ",")
             .map { |m| m.split(":") }
             .each { |id, name| assignments[id] = Free.new(id, name) unless assignments.key? id }
diff --git a/lib/lazylead/task/propagate_down.rb b/lib/lazylead/task/propagate_down.rb
index 7b0941f..782ede6 100644
--- a/lib/lazylead/task/propagate_down.rb
+++ b/lib/lazylead/task/propagate_down.rb
@@ -87,9 +87,9 @@ def fetch
       # Fill pre-defined fields for sub-tasks from parent ticket
       #  and post comment to ticket with clarification.
       def propagate
-        expected = @fields.collect { |f| [f, @issue.fields[f]] }.to_h
+        expected = @fields.to_h { |f| [f, @issue.fields[f]] }
         @subtasks.each do |subtask|
-          actual = @fields.collect { |f| [f, subtask.fields[f]] }.to_h
+          actual = @fields.to_h { |f| [f, subtask.fields[f]] }
           diff = diff(expected, actual)
           next if diff.empty?
           subtask.save(fields: diff)