diff --git a/napari/utils/_dask_utils.py b/napari/utils/_dask_utils.py
index 125f4337957..fcc5bbf59c4 100644
--- a/napari/utils/_dask_utils.py
+++ b/napari/utils/_dask_utils.py
@@ -59,14 +59,14 @@ def resize_dask_cache(
     from psutil import virtual_memory
 
     if nbytes is None and mem_fraction is not None:
-        nbytes = virtual_memory().total * mem_fraction
+        nbytes = int(virtual_memory().total * mem_fraction)
 
     avail = _DASK_CACHE.cache.available_bytes
     # if we don't have a cache already, create one.
     if avail == 1:
         # If neither nbytes nor mem_fraction was provided, use default
         if nbytes is None:
-            nbytes = virtual_memory().total * _DEFAULT_MEM_FRACTION
+            nbytes = int(virtual_memory().total * _DEFAULT_MEM_FRACTION)
         _DASK_CACHE.cache.resize(nbytes)
     elif nbytes is not None and nbytes != _DASK_CACHE.cache.available_bytes:
         # if the cache has already been registered, then calling
diff --git a/resources/requirements_mypy.txt b/resources/requirements_mypy.txt
index 4a13df89d4f..fc20c67773d 100644
--- a/resources/requirements_mypy.txt
+++ b/resources/requirements_mypy.txt
@@ -18,7 +18,7 @@ markdown-it-py==3.0.0
     # via rich
 mdurl==0.1.2
     # via markdown-it-py
-mypy==1.5.0
+mypy==1.6.0
     # via -r resources/requirements_mypy.in
 mypy-extensions==1.0.0
     # via