diff --git a/lectures/pandas/data_clean.md b/lectures/pandas/data_clean.md
index c7452768..328c4c26 100644
--- a/lectures/pandas/data_clean.md
+++ b/lectures/pandas/data_clean.md
@@ -254,12 +254,12 @@ df.fillna(value=100)
 
 ```{code-cell} python
 # use the _next_ valid observation to fill the missing data
-df.fillna(method="bfill")
+df.bfill() # in new versions of pandas, bfill will directly fill missing data
 ```
 
 ```{code-cell} python
 # use the _previous_ valid observation to fill missing data
-df.fillna(method="ffill")
+df.ffill()
 ```
 
 We will see more examples of dealing with missing data in future
diff --git a/lectures/pandas/groupby.md b/lectures/pandas/groupby.md
index fb3f249c..0b81b9e9 100644
--- a/lectures/pandas/groupby.md
+++ b/lectures/pandas/groupby.md
@@ -213,7 +213,7 @@ def smallest_by_b(df):
 ```
 
 ```{code-cell} python
-gbA.apply(smallest_by_b)
+gbA.apply(smallest_by_b, include_groups=False)
 ```
 
 Notice that the return value from applying our series transform to `gbA`
@@ -250,7 +250,7 @@ index and a `Date` column added.
 df2 = df.copy()
 df2["Date"] = pd.date_range(
     start=pd.Timestamp.today().strftime("%m/%d/%Y"),
-    freq="BQ",
+    freq="BQE",
     periods=df.shape[0]
 )
 df2 = df2.set_index("A")
@@ -260,7 +260,7 @@ df2
 We can group by year.
 
 ```{code-cell} python
-df2.groupby(pd.Grouper(key="Date", freq="A")).count()
+df2.groupby(pd.Grouper(key="Date", freq="YE")).count()
 ```
 
 We can group by the `A` level of the index.
@@ -272,14 +272,14 @@ df2.groupby(pd.Grouper(level="A")).count()
 We can combine these to group by both.
 
 ```{code-cell} python
-df2.groupby([pd.Grouper(key="Date", freq="A"), pd.Grouper(level="A")]).count()
+df2.groupby([pd.Grouper(key="Date", freq="YE"), pd.Grouper(level="A")]).count()
 ```
 
 And we can combine `pd.Grouper` with a string, where the string
 denotes a column name
 
 ```{code-cell} python
-df2.groupby([pd.Grouper(key="Date", freq="A"), "B"]).count()
+df2.groupby([pd.Grouper(key="Date", freq="YE"), "B"]).count()
 ```
 
 ## Case Study: Airline Delays
diff --git a/lectures/pandas/timeseries.md b/lectures/pandas/timeseries.md
index 9a434a68..097cfc0a 100644
--- a/lectures/pandas/timeseries.md
+++ b/lectures/pandas/timeseries.md
@@ -442,7 +442,7 @@ Below are some examples.
 
 ```{code-cell} python
 # business quarter
-btc_usd.resample("BQ").mean()
+btc_usd.resample("BQE").mean()
 ```
 
 Note that unlike with `rolling`, a single number is returned for
diff --git a/lectures/tools/maps.md b/lectures/tools/maps.md
index 359cbf5c..f1ce56a7 100644
--- a/lectures/tools/maps.md
+++ b/lectures/tools/maps.md
@@ -13,6 +13,7 @@ kernelspec:
 
 **Co-author**
 > - [Kim Ruhl *University of Wisconsin*](http://kimjruhl.com)
+> - [Philip Solimine *UBC*](https://www.psolimine.net)
 
 **Prerequisites**