diff --git a/qcodes_contrib_drivers/drivers/Horiba/Horiba_FHR.py b/qcodes_contrib_drivers/drivers/Horiba/Horiba_FHR.py
index 7b8d6a52f..df3597edc 100644
--- a/qcodes_contrib_drivers/drivers/Horiba/Horiba_FHR.py
+++ b/qcodes_contrib_drivers/drivers/Horiba/Horiba_FHR.py
@@ -398,7 +398,7 @@ def __init__(
             )
         }
 
-        super().__init__(name, additional_metadata | (metadata or {}), label)
+        super().__init__(name, additional_metadata | dict(metadata or {}), label)
 
         gratings = ChannelList(self, 'gratings', GratingChannel)
         slits = ChannelList(self, 'slits', SlitChannel)
diff --git a/requirements.txt b/requirements.txt
index 3693901ef..97b63bd60 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-mypy>=1.1.1,<1.7.0
+mypy>=1.1.1,<1.8.0
 ipython~=8.17.2