diff --git a/app/lib/request.rb b/app/lib/request.rb
index d7da9fe63..ac18bd260 100644
--- a/app/lib/request.rb
+++ b/app/lib/request.rb
@@ -233,7 +233,7 @@ class Request
       contents
     end
 
-    def body_with_limit(limit = 1.megabyte)
+    def body_with_limit(limit = 30.megabyte)
       require_limit_not_exceeded!(limit)
 
       contents = truncated_body(limit)
diff --git a/app/models/account.rb b/app/models/account.rb
index 078d7aaa0..afae0e3df 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -72,9 +72,9 @@ class Account < ApplicationRecord
   MENTION_RE    = %r{(?<![=/[:word:]])@((#{USERNAME_RE})(?:@[[:word:].-]+[[:word:]]+)?)}
   URL_PREFIX_RE = %r{\Ahttp(s?)://[^/]+}
   USERNAME_ONLY_RE = /\A#{USERNAME_RE}\z/i
-  USERNAME_LENGTH_LIMIT = 30
+  USERNAME_LENGTH_LIMIT = 72
   DISPLAY_NAME_LENGTH_LIMIT = 30
-  NOTE_LENGTH_LIMIT = 500
+  NOTE_LENGTH_LIMIT = 4_096
 
   AUTOMATED_ACTOR_TYPES = %w(Application Service).freeze
 
diff --git a/app/models/concerns/account/avatar.rb b/app/models/concerns/account/avatar.rb
index 39f599db1..329549d26 100644
--- a/app/models/concerns/account/avatar.rb
+++ b/app/models/concerns/account/avatar.rb
@@ -4,7 +4,7 @@ module Account::Avatar
   extend ActiveSupport::Concern
 
   IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
-  LIMIT = 2.megabytes
+  LIMIT = 200.megabytes
 
   class_methods do
     def avatar_styles(file)
diff --git a/app/models/concerns/account/header.rb b/app/models/concerns/account/header.rb
index 44ae774e9..9c8f122ba 100644
--- a/app/models/concerns/account/header.rb
+++ b/app/models/concerns/account/header.rb
@@ -4,7 +4,7 @@ module Account::Header
   extend ActiveSupport::Concern
 
   IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
-  LIMIT = 2.megabytes
+  LIMIT = 200.megabytes
   MAX_PIXELS = 750_000 # 1500x500px
 
   class_methods do
diff --git a/app/models/custom_emoji.rb b/app/models/custom_emoji.rb
index f1423bc2f..ad14b9e29 100644
--- a/app/models/custom_emoji.rb
+++ b/app/models/custom_emoji.rb
@@ -24,7 +24,7 @@
 class CustomEmoji < ApplicationRecord
   include Attachmentable
 
-  LIMIT = 256.kilobytes
+  LIMIT = 30.megabytes
   MINIMUM_SHORTCODE_SIZE = 2
 
   SHORTCODE_RE_FRAGMENT = '[a-zA-Z0-9_]{2,}'
diff --git a/app/models/media_attachment.rb b/app/models/media_attachment.rb
index 6708cd779..825c5b2a4 100644
--- a/app/models/media_attachment.rb
+++ b/app/models/media_attachment.rb
@@ -39,8 +39,8 @@ class MediaAttachment < ApplicationRecord
 
   MAX_DESCRIPTION_LENGTH = 1_500
 
-  IMAGE_LIMIT = 16.megabytes
-  VIDEO_LIMIT = 99.megabytes
+  IMAGE_LIMIT = 500.megabytes
+  VIDEO_LIMIT = 500.megabytes
 
   MAX_VIDEO_MATRIX_LIMIT = 8_294_400 # 3840x2160px
   MAX_VIDEO_FRAME_RATE   = 120
diff --git a/app/models/preview_card_provider.rb b/app/models/preview_card_provider.rb
index 889176036..6236e12c7 100644
--- a/app/models/preview_card_provider.rb
+++ b/app/models/preview_card_provider.rb
@@ -24,7 +24,7 @@ class PreviewCardProvider < ApplicationRecord
   include Reviewable
 
   ICON_MIME_TYPES = %w(image/x-icon image/vnd.microsoft.icon image/png).freeze
-  LIMIT = 1.megabyte
+  LIMIT = 50.megabyte
 
   validates :domain, presence: true, uniqueness: true, domain: true