diff --git a/pkgs/development/python-modules/aiobotocore/default.nix b/pkgs/development/python-modules/aiobotocore/default.nix
index 591fd8c17874..f6024c953fda 100644
--- a/pkgs/development/python-modules/aiobotocore/default.nix
+++ b/pkgs/development/python-modules/aiobotocore/default.nix
@@ -21,7 +21,7 @@ buildPythonPackage rec {
   # relax version constraints: aiobotocore works with newer botocore versions
   # the pinning used to match some `extras_require` we're not using.
   postPatch = ''
-    substituteInPlace setup.py --replace 'botocore>=1.20.49,<1.20.50' 'botocore'
+    substituteInPlace setup.py --replace 'botocore>=1.20.106,<1.20.107' 'botocore'
   '';
 
   propagatedBuildInputs = [ wrapt aiohttp aioitertools botocore ];
diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index 9cd83d69eec3..866bbe25a866 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -743,7 +743,7 @@ in with py.pkgs; buildPythonApplication rec {
 
   pytestFlagsArray = [
     # parallelize test run
-    "--numprocesses auto"
+    "--numprocesses $NIX_BUILD_CORES"
     # assign tests grouped by file to workers
     "--dist loadfile"
     # retry racy tests that end in "RuntimeError: Event loop is closed"