diff --git a/app/controllers/auth/registrations_controller.rb b/app/controllers/auth/registrations_controller.rb
index cd1c546b8..71c0cd827 100644
--- a/app/controllers/auth/registrations_controller.rb
+++ b/app/controllers/auth/registrations_controller.rb
@@ -56,8 +56,8 @@ class Auth::RegistrationsController < Devise::RegistrationsController
   end
 
   def configure_sign_up_params
-    devise_parameter_sanitizer.permit(:sign_up) do |u|
-      u.permit({ account_attributes: [:username, :display_name], invite_request_attributes: [:text] }, :email, :password, :password_confirmation, :invite_code, :agreement, :website, :confirm_password)
+    devise_parameter_sanitizer.permit(:sign_up) do |user_params|
+      user_params.permit({ account_attributes: [:username, :display_name], invite_request_attributes: [:text] }, :email, :password, :password_confirmation, :invite_code, :agreement, :website, :confirm_password)
     end
   end
 
diff --git a/app/controllers/concerns/rate_limit_headers.rb b/app/controllers/concerns/rate_limit_headers.rb
index 86fe58a71..b8696df73 100644
--- a/app/controllers/concerns/rate_limit_headers.rb
+++ b/app/controllers/concerns/rate_limit_headers.rb
@@ -58,7 +58,7 @@ module RateLimitHeaders
   end
 
   def api_throttle_data
-    most_limited_type, = request.env['rack.attack.throttle_data'].min_by { |_, v| v[:limit] - v[:count] }
+    most_limited_type, = request.env['rack.attack.throttle_data'].min_by { |_key, value| value[:limit] - value[:count] }
     request.env['rack.attack.throttle_data'][most_limited_type]
   end
 
diff --git a/app/controllers/concerns/signature_verification.rb b/app/controllers/concerns/signature_verification.rb
index 2394574b3..4502da698 100644
--- a/app/controllers/concerns/signature_verification.rb
+++ b/app/controllers/concerns/signature_verification.rb
@@ -28,8 +28,8 @@ module SignatureVerification
   end
 
   class SignatureParamsTransformer < Parslet::Transform
-    rule(params: subtree(:p)) do
-      (p.is_a?(Array) ? p : [p]).each_with_object({}) { |(key, val), h| h[key] = val }
+    rule(params: subtree(:param)) do
+      (param.is_a?(Array) ? param : [param]).each_with_object({}) { |(key, value), hash| hash[key] = value }
     end
 
     rule(param: { key: simple(:key), value: simple(:val) }) do
diff --git a/app/controllers/follower_accounts_controller.rb b/app/controllers/follower_accounts_controller.rb
index e4d8cc495..9ced18449 100644
--- a/app/controllers/follower_accounts_controller.rb
+++ b/app/controllers/follower_accounts_controller.rb
@@ -63,7 +63,7 @@ class FollowerAccountsController < ApplicationController
         id: account_followers_url(@account, page: params.fetch(:page, 1)),
         type: :ordered,
         size: @account.followers_count,
-        items: follows.map { |f| ActivityPub::TagManager.instance.uri_for(f.account) },
+        items: follows.map { |follow| ActivityPub::TagManager.instance.uri_for(follow.account) },
         part_of: account_followers_url(@account),
         next: next_page_url,
         prev: prev_page_url
diff --git a/app/controllers/following_accounts_controller.rb b/app/controllers/following_accounts_controller.rb
index f84dca1e5..febd13c97 100644
--- a/app/controllers/following_accounts_controller.rb
+++ b/app/controllers/following_accounts_controller.rb
@@ -66,7 +66,7 @@ class FollowingAccountsController < ApplicationController
         id: account_following_index_url(@account, page: params.fetch(:page, 1)),
         type: :ordered,
         size: @account.following_count,
-        items: follows.map { |f| ActivityPub::TagManager.instance.uri_for(f.target_account) },
+        items: follows.map { |follow| ActivityPub::TagManager.instance.uri_for(follow.target_account) },
         part_of: account_following_index_url(@account),
         next: next_page_url,
         prev: prev_page_url
diff --git a/app/controllers/media_controller.rb b/app/controllers/media_controller.rb
index ee82625a0..3cdd97f06 100644
--- a/app/controllers/media_controller.rb
+++ b/app/controllers/media_controller.rb
@@ -12,8 +12,8 @@ class MediaController < ApplicationController
   before_action :check_playable, only: :player
   before_action :allow_iframing, only: :player
 
-  content_security_policy only: :player do |p|
-    p.frame_ancestors(false)
+  content_security_policy only: :player do |policy|
+    policy.frame_ancestors(false)
   end
 
   def show
diff --git a/app/controllers/statuses_controller.rb b/app/controllers/statuses_controller.rb
index 9eb7ad691..0e0783b4b 100644
--- a/app/controllers/statuses_controller.rb
+++ b/app/controllers/statuses_controller.rb
@@ -17,8 +17,8 @@ class StatusesController < ApplicationController
   skip_around_action :set_locale, if: -> { request.format == :json }
   skip_before_action :require_functional!, only: [:show, :embed], unless: :whitelist_mode?
 
-  content_security_policy only: :embed do |p|
-    p.frame_ancestors(false)
+  content_security_policy only: :embed do |policy|
+    policy.frame_ancestors(false)
   end
 
   def show
diff --git a/app/controllers/tags_controller.rb b/app/controllers/tags_controller.rb
index f0a099350..65017acba 100644
--- a/app/controllers/tags_controller.rb
+++ b/app/controllers/tags_controller.rb
@@ -65,7 +65,7 @@ class TagsController < ApplicationController
       id: tag_url(@tag),
       type: :ordered,
       size: @tag.statuses.count,
-      items: @statuses.map { |s| ActivityPub::TagManager.instance.uri_for(s) }
+      items: @statuses.map { |status| ActivityPub::TagManager.instance.uri_for(status) }
     )
   end
 end