diff --git a/changes/3235.fix.md b/changes/3235.fix.md
new file mode 100644
index 0000000000..14277efc9a
--- /dev/null
+++ b/changes/3235.fix.md
@@ -0,0 +1 @@
+Fix CLI test failures caused by `yarl.URL._val` type change.
diff --git a/src/ai/backend/client/auth.py b/src/ai/backend/client/auth.py
index 5719a0e18e..a9cec5fdee 100644
--- a/src/ai/backend/client/auth.py
+++ b/src/ai/backend/client/auth.py
@@ -50,7 +50,7 @@ def generate_signature(
     Generates the API request signature from the given parameters.
     """
     hash_type = hash_type
-    hostname = endpoint._val.netloc  # type: ignore
+    hostname = endpoint.raw_authority
     body_hash = hashlib.new(hash_type, b"").hexdigest()
 
     sign_str = "{}\n{}\n{}\nhost:{}\ncontent-type:{}\nx-backendai-version:{}\n{}".format(  # noqa