diff --git a/demo.py b/demo.py
index 3c08cce..080bc4c 100755
--- a/demo.py
+++ b/demo.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 from subprocess import check_call, DEVNULL
-from shutil import copy, copytree
+from shutil import copytree, ignore_patterns
 import os
 from os.path import abspath
 from sys import executable as python
@@ -9,12 +9,17 @@ from pathlib import Path
 my_repo = Path(__file__).absolute().parent
 
 
-def run():
+def run() -> None:
     # uses fixed paths; worth it for the sake of demonstration
     # assumes we're in /tmp/my_demo now
 
     # 1. clone git@github.com:karlicoss/my.git
-    copytree(my_repo, 'my_repo', symlinks=True)
+    copytree(
+        my_repo,
+        'my_repo',
+        symlinks=True,
+        ignore=ignore_patterns('.tox*'),  # tox dir might have broken symlinks while tests are running in parallel
+    )
 
     # 2. prepare repositories you'd be using. For this demo we only set up Hypothesis
     tox = 'TOX' in os.environ
diff --git a/my/jawbone/__init__.py b/my/jawbone/__init__.py
index 9f53abe..4b41242 100644
--- a/my/jawbone/__init__.py
+++ b/my/jawbone/__init__.py
@@ -115,14 +115,15 @@ def pre_dataframe() -> Iterable[Res[SleepEntry]]:
             yield group[0]
         else:
             err = RuntimeError(f'Multiple sleeps per night, not supported yet: {group}')
-            set_error_datetime(err, dt=dd)
+            set_error_datetime(err, dt=dd)  # type: ignore[arg-type]
             logger.exception(err)
             yield err
 
 
 def dataframe():
-    dicts: List[Dict] = []
+    dicts: List[Dict[str, Any]] = []
     for s in pre_dataframe():
+        d: Dict[str, Any]
         if isinstance(s, Exception):
             dt = extract_error_datetime(s)
             d = {
@@ -141,7 +142,7 @@ def dataframe():
             }
         dicts.append(d)
 
-    import pandas as pd # type: ignore
+    import pandas as pd
     return pd.DataFrame(dicts)
     # TODO tz is in sleeps json
 
diff --git a/my/jawbone/plots.py b/my/jawbone/plots.py
index 5332fe6..5dcb63d 100755
--- a/my/jawbone/plots.py
+++ b/my/jawbone/plots.py
@@ -15,7 +15,7 @@ from typing import Dict, Any, NamedTuple
 #         print(line)
 
 import matplotlib.pyplot as plt # type: ignore
-from numpy import genfromtxt # type: ignore
+from numpy import genfromtxt
 import matplotlib.pylab as pylab # type: ignore
 
 pylab.rcParams['figure.figsize'] = (32.0, 24.0)
@@ -109,7 +109,7 @@ dates = [parse_date(u.date, yearfirst=True, dayfirst=False) for u in useful]
 
 # TODO don't need this anymore? it's gonna be in dashboards package
 from kython.plotting import plot_timestamped  # type: ignore
-for attr, lims, mavg, fig in [ # type: ignore
+for attr, lims, mavg, fig in [
         ('light', (0, 400), 5, None),
         ('deep', (0, 600), 5, None),
         ('total', (200, 600), 5, None),
@@ -128,7 +128,7 @@ for attr, lims, mavg, fig in [ # type: ignore
         if mavg is not None:
             mavgs.append((mavg, 'green'))
         fig = plot_timestamped(
-            dts, # type: ignore
+            dts,
             [getattr(u, attr) for u in useful],
             marker='.',
             ratio=(16, 4),