diff --git a/src/storage/limits.ts b/src/storage/limits.ts
index cff8627d..7396332f 100644
--- a/src/storage/limits.ts
+++ b/src/storage/limits.ts
@@ -49,7 +49,7 @@ export async function isImageTransformationEnabled(tenantId: string) {
 export function isValidKey(key: string): boolean {
   // only allow s3 safe characters and characters which require special handling for now
   // https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-keys.html
-  return key.length > 0 && /^(\w|\/|!|-|\.|\*|'|\(|\)| |&|\$|@|=|;|:|\+|,|\?)*$/.test(key)
+  return key.length > 0 && /^[\p{L}\p{N}\p{M}\/!.\-*'()& $@=;:+,?]+\.[\p{L}\p{N}\p{M}]+$/u.test(key)
 }
 
 /**
diff --git a/src/test/db/storage/limits.test.ts b/src/test/db/storage/limits.test.ts
new file mode 100644
index 00000000..9188d9da
--- /dev/null
+++ b/src/test/db/storage/limits.test.ts
@@ -0,0 +1,9 @@
+import { isValidKey } from "@storage/limits"
+
+describe("Testing limits", () => {
+  test("accept special characters as s3 object name", () => {
+    expect(isValidKey("望舌诊病.pdf")).toBe(true)
+    expect(isValidKey("ÖÄÜ.jpg")).toBe(true)
+    expect(isValidKey("åäö.png")).toBe(true)
+  })
+})