diff --git a/test_requirements.txt b/test_requirements.txt
index e43c5c27..0f619376 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -1,6 +1,4 @@
-# workaround for juju == 3.5.0.0
-# https://github.com/juju/python-libjuju/issues/1052
-juju @ git+https://github.com/juju/python-libjuju.git@53cd33d884f3ca710e1fa026c74f31b02281be69
+juju
 pydantic<2
 pylxd
 pytest
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index f914df64..08227e62 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -184,7 +184,7 @@ def switch(self, name: str, path: Path):
     def drop_constraints(self):
         """Remove constraints on applications. Useful for testing on lxd."""
         for app in self.applications.values():
-            app["constraints"] = None
+            app["constraints"] = ''
 
     def add_constraints(self, constraints: Dict[str, str]):
         """Add constraints to applications.
@@ -193,7 +193,7 @@ def add_constraints(self, constraints: Dict[str, str]):
             constraints:  Mapping of constraints to add to applications.
         """
         for app in self.applications.values():
-            val: str = app["constraints"]
+            val: str = app.get("constraints", "")
             existing = dict(kv.split("=", 1) for kv in val.split())
             existing.update(constraints)
             app["constraints"] = " ".join(f"{k}={v}" for k, v in existing.items())