diff --git a/app/models/account.rb b/app/models/account.rb
index ec49d9308..a26276b9b 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -78,7 +78,7 @@ class Account < ApplicationRecord
   validates :username, format: { with: /\A#{USERNAME_RE}\z/i }, if: -> { !local? && will_save_change_to_username? }
 
   # Local user validations
-  validates :username, format: { with: /\A[a-z0-9_]+\z/i }, length: { maximum: 30 }, if: -> { local? && will_save_change_to_username? }
+  validates :username, format: { with: /\A[a-z0-9_]+\z/i }, length: { maximum: 66 }, if: -> { local? && will_save_change_to_username? }
   validates_with UniqueUsernameValidator, if: -> { local? && will_save_change_to_username? }
   validates_with UnreservedUsernameValidator, if: -> { local? && will_save_change_to_username? }
   validates :display_name, length: { maximum: MAX_DISPLAY_NAME_LENGTH }, if: -> { local? && will_save_change_to_display_name? }
@@ -388,7 +388,7 @@ class Account < ApplicationRecord
 
     def string_limit
       if account.local?
-        255
+        666
       else
         2047
       end
diff --git a/app/models/account_identity_proof.rb b/app/models/account_identity_proof.rb
index 10b66cccf..ccd54cedc 100644
--- a/app/models/account_identity_proof.rb
+++ b/app/models/account_identity_proof.rb
@@ -18,7 +18,7 @@ class AccountIdentityProof < ApplicationRecord
   belongs_to :account
 
   validates :provider, inclusion: { in: ProofProvider::SUPPORTED_PROVIDERS }
-  validates :provider_username, format: { with: /\A[a-z0-9_]+\z/i }, length: { minimum: 2, maximum: 30 }
+  validates :provider_username, format: { with: /\A[a-z0-9_]+\z/i }, length: { minimum: 2, maximum: 66 }
   validates :provider_username, uniqueness: { scope: [:account_id, :provider] }
   validates :token, format: { with: /\A[a-f0-9]+\z/ }, length: { maximum: 66 }
 
diff --git a/app/models/account_moderation_note.rb b/app/models/account_moderation_note.rb
index 22e312bb2..c4aca7b5f 100644
--- a/app/models/account_moderation_note.rb
+++ b/app/models/account_moderation_note.rb
@@ -17,5 +17,5 @@ class AccountModerationNote < ApplicationRecord
 
   scope :latest, -> { reorder('created_at DESC') }
 
-  validates :content, presence: true, length: { maximum: 500 }
+  validates :content, presence: true, length: { maximum: 6666 }
 end
diff --git a/app/models/report.rb b/app/models/report.rb
index 86c303798..fe825759a 100644
--- a/app/models/report.rb
+++ b/app/models/report.rb
@@ -27,7 +27,7 @@ class Report < ApplicationRecord
   scope :unresolved, -> { where(action_taken: false) }
   scope :resolved,   -> { where(action_taken: true) }
 
-  validates :comment, length: { maximum: 1000 }
+  validates :comment, length: { maximum: 6666 }
 
   def local?
     false # Force uri_for to use uri attribute
diff --git a/app/models/report_note.rb b/app/models/report_note.rb
index 6d7167e0e..e1a3c0768 100644
--- a/app/models/report_note.rb
+++ b/app/models/report_note.rb
@@ -17,5 +17,5 @@ class ReportNote < ApplicationRecord
 
   scope :latest, -> { reorder(created_at: :desc) }
 
-  validates :content, presence: true, length: { maximum: 500 }
+  validates :content, presence: true, length: { maximum: 6666 }
 end