diff --git a/tests/integration_tests/instances.py b/tests/integration_tests/instances.py
index 8268a775a2a..2dc16f80f5b 100644
--- a/tests/integration_tests/instances.py
+++ b/tests/integration_tests/instances.py
@@ -215,6 +215,7 @@ def install_proposed_image(self, pkg: str):
             '$(lsb_release -sc)-proposed main" >> '
             "/etc/apt/sources.list.d/proposed.list"
         ).ok
+        assert self.execute("apt-get update").ok
         assert self.execute(
             f"apt-get install -qy {pkg} -t=$(lsb_release -sc)-proposed"
         ).ok