diff --git a/models/asymkey/gpg_key.go b/models/asymkey/gpg_key.go
index 21554d215..78dc453e0 100644
--- a/models/asymkey/gpg_key.go
+++ b/models/asymkey/gpg_key.go
@@ -33,7 +33,7 @@ type GPGKey struct {
 	OwnerID           int64              `xorm:"INDEX NOT NULL"`
 	KeyID             string             `xorm:"INDEX CHAR(16) NOT NULL"`
 	PrimaryKeyID      string             `xorm:"CHAR(16)"`
-	Content           string             `xorm:"TEXT NOT NULL"`
+	Content           string             `xorm:"MEDIUMTEXT NOT NULL"`
 	CreatedUnix       timeutil.TimeStamp `xorm:"created"`
 	ExpiredUnix       timeutil.TimeStamp
 	AddedUnix         timeutil.TimeStamp
diff --git a/models/asymkey/ssh_key.go b/models/asymkey/ssh_key.go
index 107a29e98..9f95bb5ba 100644
--- a/models/asymkey/ssh_key.go
+++ b/models/asymkey/ssh_key.go
@@ -41,7 +41,7 @@ type PublicKey struct {
 	OwnerID       int64           `xorm:"INDEX NOT NULL"`
 	Name          string          `xorm:"NOT NULL"`
 	Fingerprint   string          `xorm:"INDEX NOT NULL"`
-	Content       string          `xorm:"TEXT NOT NULL"`
+	Content       string          `xorm:"MEDIUMTEXT NOT NULL"`
 	Mode          perm.AccessMode `xorm:"NOT NULL DEFAULT 2"`
 	Type          KeyType         `xorm:"NOT NULL DEFAULT 1"`
 	LoginSourceID int64           `xorm:"NOT NULL DEFAULT 0"`
diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
index 30c4ad250..28ffc9988 100644
--- a/models/migrations/migrations.go
+++ b/models/migrations/migrations.go
@@ -406,8 +406,13 @@ var migrations = []Migration{
 	NewMigration("Drop old CredentialID column", dropOldCredentialIDColumn),
 	// v223 -> v224
 	NewMigration("Rename CredentialIDBytes column to CredentialID", renameCredentialIDBytes),
+
+	// Gitea 1.17.0 ends at v224
+
 	// v224 -> v225
-	NewMigration("Add badges to users", creatUserBadgesTable),
+	NewMigration("Add badges to users", createUserBadgesTable),
+	// v225 -> v226
+	NewMigration("Alter gpg_key/public_key content TEXT fields to MEDIUMTEXT", alterPublicGPGKeyContentFieldsToMediumText),
 }
 
 // GetCurrentDBVersion returns the current db version
diff --git a/models/migrations/v224.go b/models/migrations/v224.go
index d684d538d..2ed161ef4 100644
--- a/models/migrations/v224.go
+++ b/models/migrations/v224.go
@@ -8,7 +8,7 @@ import (
 	"xorm.io/xorm"
 )
 
-func creatUserBadgesTable(x *xorm.Engine) error {
+func createUserBadgesTable(x *xorm.Engine) error {
 	type Badge struct {
 		ID          int64 `xorm:"pk autoincr"`
 		Description string
diff --git a/models/migrations/v225.go b/models/migrations/v225.go
new file mode 100644
index 000000000..6dd460eb6
--- /dev/null
+++ b/models/migrations/v225.go
@@ -0,0 +1,29 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+func alterPublicGPGKeyContentFieldsToMediumText(x *xorm.Engine) error {
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	if setting.Database.UseMySQL {
+		if _, err := sess.Exec("ALTER TABLE `gpg_key` CHANGE `content` `content` MEDIUMTEXT"); err != nil {
+			return err
+		}
+		if _, err := sess.Exec("ALTER TABLE `public_key` CHANGE `content` `content` MEDIUMTEXT"); err != nil {
+			return err
+		}
+	}
+	return sess.Commit()
+}