diff --git a/backend/src/db/migrations/20250721101756_bump-aws-arn-field-size.ts b/backend/src/db/migrations/20250721101756_bump-aws-arn-field-size.ts
new file mode 100644
index 000000000..1814df472
--- /dev/null
+++ b/backend/src/db/migrations/20250721101756_bump-aws-arn-field-size.ts
@@ -0,0 +1,21 @@
+import { Knex } from "knex";
+
+import { TableName } from "../schemas";
+
+export async function up(knex: Knex): Promise<void> {
+  const hasColumn = await knex.schema.hasColumn(TableName.IdentityAwsAuth, "allowedPrincipalArns");
+  if (hasColumn) {
+    await knex.schema.alterTable(TableName.IdentityAwsAuth, (t) => {
+      t.string("allowedPrincipalArns", 4096).notNullable().alter();
+    });
+  }
+}
+
+export async function down(knex: Knex): Promise<void> {
+  const hasColumn = await knex.schema.hasColumn(TableName.IdentityAwsAuth, "allowedPrincipalArns");
+  if (hasColumn) {
+    await knex.schema.alterTable(TableName.IdentityAwsAuth, (t) => {
+      t.string("allowedPrincipalArns", 2048).notNullable().alter();
+    });
+  }
+}
diff --git a/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts b/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts
index d0ef6fd88..098bdcf9a 100644
--- a/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts
+++ b/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts
@@ -37,7 +37,7 @@ export const validateAccountIds = z
 export const validatePrincipalArns = z
   .string()
   .trim()
-  .max(2048)
+  .max(4096)
   .default("")
   // Custom validation for ARN format
   .refine(