diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 42ea2342b..172f44bad 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1520,15 +1520,6 @@ Rails/SkipsModelValidations:
     - 'spec/services/follow_service_spec.rb'
     - 'spec/services/update_account_service_spec.rb'
 
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Rails/SquishedSQLHeredocs:
-  Exclude:
-    - 'db/migrate/20170920024819_status_ids_to_timestamp_ids.rb'
-    - 'db/migrate/20180608213548_reject_following_blocked_users.rb'
-    - 'db/post_migrate/20190519130537_remove_boosts_widening_audience.rb'
-    - 'lib/mastodon/snowflake.rb'
-    - 'lib/tasks/tests.rake'
-
 Rails/TransactionExitStatement:
   Exclude:
     - 'app/lib/activitypub/activity/announce.rb'
diff --git a/db/migrate/20170920024819_status_ids_to_timestamp_ids.rb b/db/migrate/20170920024819_status_ids_to_timestamp_ids.rb
index 8679f8ece..82e91f1e1 100644
--- a/db/migrate/20170920024819_status_ids_to_timestamp_ids.rb
+++ b/db/migrate/20170920024819_status_ids_to_timestamp_ids.rb
@@ -4,7 +4,7 @@ class StatusIdsToTimestampIds < ActiveRecord::Migration[5.1]
     Mastodon::Snowflake.define_timestamp_id
 
     # Set up the statuses.id column to use our timestamp-based IDs.
-    ActiveRecord::Base.connection.execute(<<~SQL)
+    ActiveRecord::Base.connection.execute(<<~SQL.squish)
       ALTER TABLE statuses
       ALTER COLUMN id
       SET DEFAULT timestamp_id('statuses')
@@ -21,7 +21,7 @@ class StatusIdsToTimestampIds < ActiveRecord::Migration[5.1]
 
     # We lock the table during this so that the ID won't get clobbered,
     # but ID is indexed, so this should be a fast operation.
-    ActiveRecord::Base.connection.execute(<<~SQL)
+    ActiveRecord::Base.connection.execute(<<~SQL.squish)
       LOCK statuses;
       SELECT setval('statuses_id_seq', (SELECT MAX(id) FROM statuses));
       ALTER TABLE statuses
diff --git a/db/migrate/20180608213548_reject_following_blocked_users.rb b/db/migrate/20180608213548_reject_following_blocked_users.rb
index 78f8df538..bb21bd8fa 100644
--- a/db/migrate/20180608213548_reject_following_blocked_users.rb
+++ b/db/migrate/20180608213548_reject_following_blocked_users.rb
@@ -2,14 +2,14 @@ class RejectFollowingBlockedUsers < ActiveRecord::Migration[5.2]
   disable_ddl_transaction!
 
   def up
-    blocked_follows = Follow.find_by_sql(<<-SQL)
+    blocked_follows = Follow.find_by_sql(<<-SQL.squish)
       select f.* from follows f
       inner join blocks b on
         f.account_id = b.target_account_id and
         f.target_account_id = b.account_id
     SQL
 
-    domain_blocked_follows = Follow.find_by_sql(<<-SQL)
+    domain_blocked_follows = Follow.find_by_sql(<<-SQL.squish)
       select f.* from follows f
       inner join accounts following on f.account_id = following.id
       inner join account_domain_blocks b on
diff --git a/db/post_migrate/20190519130537_remove_boosts_widening_audience.rb b/db/post_migrate/20190519130537_remove_boosts_widening_audience.rb
index d2d924239..f1708b2e1 100644
--- a/db/post_migrate/20190519130537_remove_boosts_widening_audience.rb
+++ b/db/post_migrate/20190519130537_remove_boosts_widening_audience.rb
@@ -2,7 +2,7 @@ class RemoveBoostsWideningAudience < ActiveRecord::Migration[5.2]
   disable_ddl_transaction!
 
   def up
-    public_boosts = Status.find_by_sql(<<-SQL)
+    public_boosts = Status.find_by_sql(<<-SQL.squish)
       SELECT boost.id
       FROM statuses AS boost
       LEFT JOIN statuses AS boosted ON boost.reblog_of_id = boosted.id
diff --git a/lib/mastodon/snowflake.rb b/lib/mastodon/snowflake.rb
index 8030288af..32ed140c3 100644
--- a/lib/mastodon/snowflake.rb
+++ b/lib/mastodon/snowflake.rb
@@ -146,7 +146,7 @@ module Mastodon::Snowflake
     private
 
     def already_defined?
-      connection.execute(<<~SQL).values.first.first
+      connection.execute(<<~SQL.squish).values.first.first
         SELECT EXISTS(
           SELECT * FROM pg_proc WHERE proname = 'timestamp_id'
         );
diff --git a/lib/tasks/tests.rake b/lib/tasks/tests.rake
index 35073b78b..ceb421f4b 100644
--- a/lib/tasks/tests.rake
+++ b/lib/tasks/tests.rake
@@ -113,7 +113,7 @@ namespace :tests do
 
     desc 'Populate the database with test data for 2.4.0'
     task populate_v2_4: :environment do # rubocop:disable Naming/VariableNumber
-      ActiveRecord::Base.connection.execute(<<~SQL)
+      ActiveRecord::Base.connection.execute(<<~SQL.squish)
         INSERT INTO "settings"
           (id, thing_type, thing_id, var, value, created_at, updated_at)
         VALUES