diff --git a/src/models/entities/app.ts b/src/models/entities/app.ts
index d0c89000f..ea8754631 100644
--- a/src/models/entities/app.ts
+++ b/src/models/entities/app.ts
@@ -53,7 +53,7 @@ export class App {
 	public permission: string[];
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: 'The callbackUrl of the App.'
 	})
 	public callbackUrl: string | null;
diff --git a/src/models/entities/emoji.ts b/src/models/entities/emoji.ts
index da04da897..020636a7f 100644
--- a/src/models/entities/emoji.ts
+++ b/src/models/entities/emoji.ts
@@ -25,12 +25,12 @@ export class Emoji {
 	public host: string | null;
 
 	@Column('varchar', {
-		length: 256,
+		length: 512,
 	})
 	public url: string;
 
 	@Column('varchar', {
-		length: 256, nullable: true
+		length: 512, nullable: true
 	})
 	public uri: string | null;
 
diff --git a/src/models/entities/follow-request.ts b/src/models/entities/follow-request.ts
index 80a71fe48..22ec26396 100644
--- a/src/models/entities/follow-request.ts
+++ b/src/models/entities/follow-request.ts
@@ -53,13 +53,13 @@ export class FollowRequest {
 	public followerHost: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followerInbox: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followerSharedInbox: string | null;
@@ -71,13 +71,13 @@ export class FollowRequest {
 	public followeeHost: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followeeInbox: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followeeSharedInbox: string | null;
diff --git a/src/models/entities/following.ts b/src/models/entities/following.ts
index 963873d11..ee3286a1a 100644
--- a/src/models/entities/following.ts
+++ b/src/models/entities/following.ts
@@ -48,13 +48,13 @@ export class Following {
 	public followerHost: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followerInbox: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followerSharedInbox: string | null;
@@ -66,13 +66,13 @@ export class Following {
 	public followeeHost: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followeeInbox: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: '[Denormalized]'
 	})
 	public followeeSharedInbox: string | null;
diff --git a/src/models/entities/meta.ts b/src/models/entities/meta.ts
index c34f5b690..00a71cd82 100644
--- a/src/models/entities/meta.ts
+++ b/src/models/entities/meta.ts
@@ -78,27 +78,27 @@ export class Meta {
 	public blockedHosts: string[];
 
 	@Column('varchar', {
-		length: 256,
+		length: 512,
 		nullable: true,
 		default: '/assets/ai.png'
 	})
 	public mascotImageUrl: string | null;
 
 	@Column('varchar', {
-		length: 256,
+		length: 512,
 		nullable: true
 	})
 	public bannerUrl: string | null;
 
 	@Column('varchar', {
-		length: 256,
+		length: 512,
 		nullable: true,
 		default: 'https://ai.misskey.xyz/aiart/yubitun.png'
 	})
 	public errorImageUrl: string | null;
 
 	@Column('varchar', {
-		length: 256,
+		length: 512,
 		nullable: true
 	})
 	public iconUrl: string | null;
diff --git a/src/models/entities/note.ts b/src/models/entities/note.ts
index 4c481964b..5e8397819 100644
--- a/src/models/entities/note.ts
+++ b/src/models/entities/note.ts
@@ -126,7 +126,7 @@ export class Note {
 
 	@Index({ unique: true })
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: 'The URI of a note. it will be null when the note is local.'
 	})
 	public uri: string | null;
diff --git a/src/models/entities/sw-subscription.ts b/src/models/entities/sw-subscription.ts
index f0f2a69f1..7c3f6f0a6 100644
--- a/src/models/entities/sw-subscription.ts
+++ b/src/models/entities/sw-subscription.ts
@@ -21,7 +21,7 @@ export class SwSubscription {
 	public user: User | null;
 
 	@Column('varchar', {
-		length: 256,
+		length: 512,
 	})
 	public endpoint: string;
 
diff --git a/src/models/entities/user.ts b/src/models/entities/user.ts
index 40d27a42b..ebf07ff3f 100644
--- a/src/models/entities/user.ts
+++ b/src/models/entities/user.ts
@@ -96,12 +96,12 @@ export class User {
 	public tags: string[];
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 	})
 	public avatarUrl: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 	})
 	public bannerUrl: string | null;
 
@@ -175,26 +175,26 @@ export class User {
 	public host: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
-		comment: 'The inbox of the User. It will be null if the origin of the user is local.'
+		length: 512, nullable: true,
+		comment: 'The inbox URL of the User. It will be null if the origin of the user is local.'
 	})
 	public inbox: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
-		comment: 'The sharedInbox of the User. It will be null if the origin of the user is local.'
+		length: 512, nullable: true,
+		comment: 'The sharedInbox URL of the User. It will be null if the origin of the user is local.'
 	})
 	public sharedInbox: string | null;
 
 	@Column('varchar', {
-		length: 256, nullable: true,
-		comment: 'The featured of the User. It will be null if the origin of the user is local.'
+		length: 512, nullable: true,
+		comment: 'The featured URL of the User. It will be null if the origin of the user is local.'
 	})
 	public featured: string | null;
 
 	@Index()
 	@Column('varchar', {
-		length: 256, nullable: true,
+		length: 512, nullable: true,
 		comment: 'The URI of the User. It will be null if the origin of the user is local.'
 	})
 	public uri: string | null;