diff --git a/db/create.go b/db/create.go
index 1e9e679..164eab8 100644
--- a/db/create.go
+++ b/db/create.go
@@ -57,6 +57,7 @@ const (
 	ColumnTypeChar     ColumnType = iota
 	ColumnTypeVarChar  ColumnType = iota
 	ColumnTypeText     ColumnType = iota
+	ColumnTypeLongText ColumnType = iota
 	ColumnTypeDateTime ColumnType = iota
 )
 
@@ -125,6 +126,14 @@ func (d ColumnType) Format(dialect DialectType, size OptionalInt) (string, error
 		return "DATETIME", nil
 	case ColumnTypeText:
 		return "TEXT", nil
+	case ColumnTypeLongText:
+		{
+			// MySQL TEXT is limited to 64KB, so use MEDIUMTEXT for larger sizes (up to 16MB)
+			if dialect == DialectMySQL {
+				return "MEDIUMTEXT", nil
+			}
+			return "TEXT", nil
+		}
 	}
 	return "", fmt.Errorf("unsupported column type %d for dialect %d and size %v", d, dialect, size)
 }
diff --git a/migrations/migrations.go b/migrations/migrations.go
index 6b5b094..ed5a434 100644
--- a/migrations/migrations.go
+++ b/migrations/migrations.go
@@ -72,6 +72,7 @@ var migrations = []Migration{
 	New("support password resetting", supportPassReset),             // V13 -> V14
 	New("speed up blog post retrieval", addPostRetrievalIndex),      // V14 -> V15
 	New("support ActivityPub likes", supportRemoteLikes),            // V15 -> V16 (v0.16.0)
+	New("posts.content column size", increasePostContentSize),       // V16 -> V17
 }
 
 // CurrentVer returns the current migration version the application is on
diff --git a/migrations/v16.go b/migrations/v16.go
index 03ce78a..e4f39dd 100644
--- a/migrations/v16.go
+++ b/migrations/v16.go
@@ -36,3 +36,4 @@ func supportRemoteLikes(db *datastore) error {
 
 	return nil
 }
+
diff --git a/migrations/v17.go b/migrations/v17.go
new file mode 100644
index 0000000..19607af
--- /dev/null
+++ b/migrations/v17.go
@@ -0,0 +1,51 @@
+/*
+ * Copyright © 2019-2024 Musing Studio LLC.
+ *
+ * This file is part of WriteFreely.
+ *
+ * WriteFreely is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, included
+ * in the LICENSE file in this source code package.
+ */
+
+package migrations
+
+import (
+	"context"
+	"database/sql"
+
+	wf_db "github.com/writefreely/writefreely/db"
+)
+
+func increasePostContentSize(db *datastore) error {
+	if db.driverName != driverMySQL {
+		// Only MySQL databases need this migration
+		return nil
+	}
+
+	dialect := wf_db.DialectMySQL
+	return wf_db.RunTransactionWithOptions(context.Background(), db.DB, &sql.TxOptions{}, func(ctx context.Context, tx *sql.Tx) error {
+		builders := []wf_db.SQLBuilder{
+			dialect.AlterTable("posts").
+				ChangeColumn("content",
+					dialect.Column(
+						"column",
+						wf_db.ColumnTypeLongText,
+						wf_db.OptionalInt{
+							Set: false,
+							Value: 0,
+						}).SetNullable(false)),
+		}
+		for _, builder := range builders {
+			query, err := builder.ToSQL()
+			if err != nil {
+				return err
+			}
+			if _, err := tx.ExecContext(ctx, query); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}
+