diff --git a/packages/cli/src/Server.ts b/packages/cli/src/Server.ts
index 7432c43a96..a2c38fa75a 100644
--- a/packages/cli/src/Server.ts
+++ b/packages/cli/src/Server.ts
@@ -816,6 +816,7 @@ class App {
 			TagHelpers.validateRequestBody(req.body);
 
 			const { name } = req.body;
+			await TagHelpers.validateName(name);
 			TagHelpers.validateLength(name);
 
 			const id = Number(req.params.id);
diff --git a/packages/cli/src/TagHelpers.ts b/packages/cli/src/TagHelpers.ts
index 5390ccb787..d80dddc461 100644
--- a/packages/cli/src/TagHelpers.ts
+++ b/packages/cli/src/TagHelpers.ts
@@ -2,7 +2,7 @@ import { FindOneOptions, getConnection } from "typeorm";
 import { Db, ResponseHelper } from ".";
 
 /**
- * Validate whether a tag name exists so that it cannot be used for a create operation.
+ * Validate whether a tag name exists so that it cannot be used for a create/update operation.
  */
 export async function validateName(name: string): Promise<void> | never {
 	const findQuery = { where: { name } } as FindOneOptions;