diff --git a/my/body/weight.py b/my/body/weight.py
index 277b4d1..51e6513 100644
--- a/my/body/weight.py
+++ b/my/body/weight.py
@@ -83,7 +83,7 @@ def make_dataframe(data: Iterator[Result]):
                 }
 
     df = pd.DataFrame(it())
-    df.set_index('dt', inplace=True)
+    df = df.set_index('dt')
     # TODO not sure about UTC??
     df.index = pd.to_datetime(df.index, utc=True)
     return df
diff --git a/my/emfit/__init__.py b/my/emfit/__init__.py
index 71a483f..9934903 100644
--- a/my/emfit/__init__.py
+++ b/my/emfit/__init__.py
@@ -155,9 +155,9 @@ def dataframe() -> DataFrameT:
             last = s  # meh
         dicts.append(d)
 
-    import pandas
+    import pandas as pd
 
-    return pandas.DataFrame(dicts)
+    return pd.DataFrame(dicts)
 
 
 def stats() -> Stats:
diff --git a/ruff.toml b/ruff.toml
index 8cbc642..c2c88ef 100644
--- a/ruff.toml
+++ b/ruff.toml
@@ -9,9 +9,11 @@ lint.extend-select = [
     "C4",   # flake8-comprehensions -- unnecessary list/map/dict calls
     "COM",  # trailing commas
     "EXE",  # various checks wrt executable files
+    "ICN",  # various import conventions
     "FBT",  # detect use of boolean arguments
     "FURB", # various rules
     "PERF", # various potential performance speedups
+    "PD",   # pandas rules
     "PIE",  # 'misc' lints
     "PLR",  # 'refactor' rules
     "PLW",  # pylint warnings
@@ -104,4 +106,6 @@ lint.ignore = [
     "PT012",  # pytest raises should contain a single statement
 
     "COM812",  # trailing comma missing -- TODO maybe use this?
+
+    "PD901",   # generic variable name df
 ]