diff --git a/pyproject.toml b/pyproject.toml
index 8b14283..9dbad81 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
     "packaging>=21.3",
     "securesystemslib[crypto,pynacl]>=0.26.0",
     "setuptools>=65.5.1",
-    "tuf==3.1.*",
+    "tuf==4.0.*",
     # constraints on sub-dependencies
     "certifi>=2022.12.7",
     "cryptography>=38.0.3",
diff --git a/src/tufup/client.py b/src/tufup/client.py
index cade5ea..2a9a9e0 100644
--- a/src/tufup/client.py
+++ b/src/tufup/client.py
@@ -70,7 +70,7 @@ def trusted_target_metas(self) -> list:
         if self._trusted_set.targets:
             _trusted_target_metas = [
                 TargetMeta(target_path=key, custom=target.custom)
-                for key, target in self._trusted_set.targets.signed.targets.items()
+                for key, target in self._trusted_set.targets.targets.items()
             ]
             logger.debug(f'{len(_trusted_target_metas)} TargetMeta objects created')
         else: