diff --git a/.gitignore b/.gitignore
index 78cd628d0..a01bf0094 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,7 @@ __pycache__/
 /repository/
 /results
 /last_rid.pyon
-/dataset_db.pyon
+/dataset_db.mdb
+/dataset_db.mdb-lock
 /device_db*.py
 /test*
diff --git a/artiq/_version.py b/artiq/_version.py
index e308ce8c2..bf9797c9d 100644
--- a/artiq/_version.py
+++ b/artiq/_version.py
@@ -1,4 +1,4 @@
 import os
 
 def get_version():
-    return os.getenv("VERSIONEER_OVERRIDE", default="8.0.beta")
+    return os.getenv("VERSIONEER_OVERRIDE", default="8.0+unknown.beta")
diff --git a/artiq/test/hardware_testbench.py b/artiq/test/hardware_testbench.py
index f8f936340..ee58cfcdc 100644
--- a/artiq/test/hardware_testbench.py
+++ b/artiq/test/hardware_testbench.py
@@ -5,6 +5,7 @@ import os
 import sys
 import unittest
 import logging
+from tempfile import TemporaryDirectory
 
 from nac3artiq import CompileError
 
@@ -20,9 +21,10 @@ logger = logging.getLogger(__name__)
 @unittest.skipUnless(artiq_root, "no ARTIQ_ROOT")
 class ExperimentCase(unittest.TestCase):
     def setUp(self):
+        self.tempdir = TemporaryDirectory(prefix="artiq_hw_test")
         self.device_db = DeviceDB(os.path.join(artiq_root, "device_db.py"))
         self.dataset_db = DatasetDB(
-            os.path.join(artiq_root, "dataset_db.mdb"))
+            os.path.join(self.tempdir.name, "dataset_db.mdb"))
         self.device_mgr = DeviceManager(
             self.device_db, virtual_devices={"scheduler": DummyScheduler()})
         self.dataset_mgr = DatasetManager(self.dataset_db)
@@ -30,6 +32,7 @@ class ExperimentCase(unittest.TestCase):
     def tearDown(self):
         self.device_mgr.close_devices()
         self.dataset_db.close_db()
+        self.tempdir.cleanup()
 
     def create(self, cls, *args, **kwargs):
         try:
diff --git a/artiq/test/test_client.py b/artiq/test/test_client.py
index f3110d150..aa6cae692 100644
--- a/artiq/test/test_client.py
+++ b/artiq/test/test_client.py
@@ -29,8 +29,8 @@ def get_env():
 
 class TestClient(unittest.TestCase):
     def setUp(self):
-        self.tmp_dir = TemporaryDirectory(prefix="test")
-        self.tmp_empty_dir = TemporaryDirectory(prefix="empty_repo")
+        self.tmp_dir = TemporaryDirectory(prefix="artiq_client_test")
+        self.tmp_empty_dir = TemporaryDirectory(prefix="artiq_empty_repo")
         self.exp_name = "experiment.py"
         self.exp_path = os.path.join(self.tmp_dir.name, self.exp_name)
         self.device_db_path = os.path.join(self.tmp_dir.name, "device_db.py")
diff --git a/flake.nix b/flake.nix
index 66dfdb80c..8549fa4d1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -20,7 +20,7 @@
       artiqVersionMajor = 9;
       artiqVersionMinor = self.sourceInfo.revCount or 0;
       artiqVersionId = self.sourceInfo.shortRev or "unknown";
-      artiqVersion = (builtins.toString artiqVersionMajor) + "." + (builtins.toString artiqVersionMinor) + "." + artiqVersionId + ".beta";
+      artiqVersion = (builtins.toString artiqVersionMajor) + "." + (builtins.toString artiqVersionMinor) + "+" + artiqVersionId + ".beta";
       artiqRev = self.sourceInfo.rev or "unknown";
 
       rustManifest = pkgs.fetchurl {
diff --git a/versioneer.py b/versioneer.py
index ca4e6276f..eae28b2c6 100644
--- a/versioneer.py
+++ b/versioneer.py
@@ -11,7 +11,7 @@ def get_rev():
 """
 
 def get_version():
-    return os.getenv("VERSIONEER_OVERRIDE", default="9.0.beta")
+    return os.getenv("VERSIONEER_OVERRIDE", default="9.0+unknown.beta")
 
 def get_rev():
     return os.getenv("VERSIONEER_REV", default="unknown")