diff --git a/pep600_compliance/images/package_manager.py b/pep600_compliance/images/package_manager.py
index a00bef7..f550eba 100644
--- a/pep600_compliance/images/package_manager.py
+++ b/pep600_compliance/images/package_manager.py
@@ -167,6 +167,10 @@ def _update(self, container):
                 ["touch", "/var/lib/slackpkg/current"]
             )
             assert exit_code == 0, output.decode("utf-8")
+            exit_code, output = container.exec_run(
+                ["slackpkg", "-default_answer=yes", "-batch=on", "update", "gpg"]
+            )
+            assert exit_code == 0, output.decode("utf-8")
         super()._update(container)
 
     def _upgrade(self, container):