diff --git a/.github/workflows/flake8.yaml b/.github/workflows/flake8.yaml
index 286cece7..c71678e4 100644
--- a/.github/workflows/flake8.yaml
+++ b/.github/workflows/flake8.yaml
@@ -29,6 +29,6 @@ jobs:
     - name: List changed files
       run: |
         git diff --compact-summary "origin/$GITHUB_BASE_REF"
-    - name: Run linter on changed files
+    - name: Run linter
       run: |
-        git diff "origin/$GITHUB_BASE_REF" -- "*.py" | flake8 . --config=.flake8 --diff --count --statistics --show-source
+        flake8 . --config=.flake8 --count --statistics --show-source
diff --git a/docs/sphinx/source/changelog.rst b/docs/sphinx/source/changelog.rst
index 5ff6ed6b..4260e3db 100644
--- a/docs/sphinx/source/changelog.rst
+++ b/docs/sphinx/source/changelog.rst
@@ -1,6 +1,7 @@
 RdTools Change Log
 ==================
 .. include:: changelog/pending.rst
+.. include:: changelog/v2.1.4.rst
 .. include:: changelog/v2.2.0-beta.0.rst
 .. include:: changelog/v2.1.3.rst
 .. include:: changelog/v2.1.2.rst
diff --git a/docs/sphinx/source/changelog/pending.rst b/docs/sphinx/source/changelog/pending.rst
deleted file mode 100644
index 43f76aa0..00000000
--- a/docs/sphinx/source/changelog/pending.rst
+++ /dev/null
@@ -1,9 +0,0 @@
-************************
-Pending
-************************
-
-Requirements
-------------
-* Bump ``Pillow==9.3.0`` in ``requirements.txt`` (:pull:`349`)
-* Bump ``jupyter-core==4.11.2`` in ``docs\notebook_requirements.txt`` (:pull:`350`)
-
diff --git a/docs/sphinx/source/changelog/v2.1.4.rst b/docs/sphinx/source/changelog/v2.1.4.rst
new file mode 100644
index 00000000..e7701d4c
--- /dev/null
+++ b/docs/sphinx/source/changelog/v2.1.4.rst
@@ -0,0 +1,35 @@
+*************************
+v2.1.4 (December 1, 2022)
+*************************
+
+Bug Fixes
+---------
+* :py:func:`~rdtools.degradation.degradation_year_on_year` no longer raises
+  an error for inputs exactly two years long (:pull:`339`)
+* :py:func:`~rdtools.plotting.soiling_interval_plot` no longer ignores the optional
+  ``point_color``, ``profile_color``, ``point_alpha``, and ``profile_alpha`` parameters.
+  (:issue:`343`, :pull:`345`)
+
+Testing
+-------
+* Added a CI notebook check (:pull:`270`)
+
+Requirements
+------------
+* Upgrade the notebook environment from python 3.7 to python 3.10.
+  Several dependency versions in ``docs/notebook_requirements.txt`` are
+  updated as well. (:issue:`319`, :pull:`326`)
+* Bump ``ipython==7.16.3``, ``jupyter-console==6.4.0``,
+  and ``prompt-toolkit==3.0.27`` in ``docs/notebook_requirements.txt``
+  and bump ``Pillow==9.3.0`` in ``requirements.txt`` (:pull:`314`, :pull:`349`)
+* Bump ``jupyter-core==4.11.2`` in ``docs\notebook_requirements.txt`` (:pull:`350`)
+* Bump ``sphinx`` version from 3.2 to 4.5 and ``nbsphinx`` version
+  from 0.8.5 to 0.8.8 in the optional ``[doc]`` requirements (:pull:`317`, :pull:`325`)
+* A number of other requirements updates (:pull:`337`)
+
+Contributors
+------------
+* Sandra Villamar (:ghuser:`SandraVillamar`)
+* Michael Deceglie (:ghuser:`mdeceglie`)
+* Chris Deline (:ghuser:`cdeline`)
+* Kevin Anderson (:ghuser:`kanderso-nrel`)
diff --git a/docs/sphinx/source/conf.py b/docs/sphinx/source/conf.py
index ee084ec7..ff39965b 100644
--- a/docs/sphinx/source/conf.py
+++ b/docs/sphinx/source/conf.py
@@ -127,6 +127,7 @@ def setup(app):
 # based on
 # https://gist.github.com/flying-sheep/b65875c0ce965fbdd1d9e5d0b9851ef1
 
+
 def get_obj_module(qualname):
     """
     Get a module/class/attribute and its original module by qualname.
diff --git a/rdtools/degradation.py b/rdtools/degradation.py
index c7db959f..36a6fbcb 100644
--- a/rdtools/degradation.py
+++ b/rdtools/degradation.py
@@ -244,11 +244,19 @@ def degradation_year_on_year(energy_normalized, recenter=True,
         raise ValueError('energy_normalized must not be '
                          'more frequent than daily')
 
-    # Detect less than 2 years of data
-    if energy_normalized.index[-1] - energy_normalized.index[0] < \
-            pd.Timedelta('730d'):
-        raise ValueError('must provide at least two years of '
-                         'normalized energy')
+    # Detect less than 2 years of data. This is complicated by two things:
+    #   - leap days muddle the precise meaning of "two years of data".
+    #   - can't just check the number of days between the first and last
+    #     index values, since non-daily (e.g. weekly) inputs span
+    #     a longer period than their index values directly indicate.
+    # See the unit tests for several motivating cases.
+    if energy_normalized.index.inferred_freq is not None:
+        step = pd.tseries.frequencies.to_offset(energy_normalized.index.inferred_freq)
+    else:
+        step = energy_normalized.index.to_series().diff().median()
+
+    if energy_normalized.index[-1] < energy_normalized.index[0] + pd.DateOffset(years=2) - step:
+        raise ValueError('must provide at least two years of normalized energy')
 
     # If circular block bootstrapping...
     if uncertainty_method == 'circular_block':
@@ -287,6 +295,7 @@ def degradation_year_on_year(energy_normalized, recenter=True,
     df.index = df.dt
 
     yoy_result = df.yoy.dropna()
+
     df_right = df.set_index(df.dt_right).drop_duplicates('dt_right')
     df['usage_of_points'] = df.yoy.notnull().astype(int).add(
                 df_right.yoy.notnull().astype(int), fill_value=0)
diff --git a/rdtools/plotting.py b/rdtools/plotting.py
index 7c5b2991..cb86329e 100644
--- a/rdtools/plotting.py
+++ b/rdtools/plotting.py
@@ -238,8 +238,8 @@ def soiling_interval_plot(soiling_info, normalized_yield, point_alpha=0.5,
     sratio = soiling_info['soiling_ratio_perfect_clean']
     fig, ax = plt.subplots()
     renormalized = normalized_yield / soiling_info['renormalizing_factor']
-    ax.plot(renormalized.index, renormalized, 'o')
-    ax.plot(sratio.index, sratio, 'o')
+    ax.plot(renormalized.index, renormalized, 'o', c=point_color, alpha=point_alpha)
+    ax.plot(sratio.index, sratio, 'o', c=profile_color, alpha=profile_alpha)
     ax.set_ylim(ymin, ymax)
     ax.set_ylabel('Renormalized energy')
 
diff --git a/rdtools/test/degradation_test.py b/rdtools/test/degradation_test.py
index 676a4a6f..8e5ae557 100644
--- a/rdtools/test/degradation_test.py
+++ b/rdtools/test/degradation_test.py
@@ -1,6 +1,7 @@
 """ Degradation Module Tests. """
 
 import unittest
+import pytest
 import sys
 
 import pandas as pd
@@ -185,6 +186,32 @@ def test_usage_of_points(self):
         self.assertTrue((np.sum(rd_result[2]['usage_of_points'])) == 1462)
 
 
+@pytest.mark.parametrize('start,end,freq', [
+    ('2014-01-01', '2015-12-31', 'D'),   # no leap day
+    ('2015-01-01', '2016-12-31', 'D'),   # leap day included in index
+    ('2015-01-01', '2016-12-29', '7D'),  # leap day in period but not in index
+    ('2016-06-01', '2018-05-31', 'D'),   # leap year, but no leap day in period
+    #  ('2016-02-29', '2018-02-28', 'd'),   # starts on leap day (doesn't work)
+    ('2014-03-01', '2016-02-29', 'D'),   # ends on leap day
+    ('2015-01-01', '2016-12-31', 'M'),   # month end
+    ('2015-01-01', '2016-12-31', 'MS'),   # month start
+])
+def test_yoy_two_years_error(start, end, freq):
+    # GH 339
+    times = pd.date_range(start, end, freq=freq)
+    series = pd.Series(1, index=times)
+    # introduce NaN at the end to ensure that the 2 year requirement applies to
+    # timestamps, not non-nan values:
+    series.iloc[-5:] = np.nan
+    # should not raise an error
+    _ = degradation_year_on_year(series)
+    # but if we shorten it by one element, then it should:
+    with pytest.raises(ValueError, match='must provide at least two years'):
+        _ = degradation_year_on_year(series.iloc[:-1])
+    with pytest.raises(ValueError, match='must provide at least two years'):
+        _ = degradation_year_on_year(series.iloc[1:])
+
+
 if __name__ == '__main__':
     # Initialize logger when run as a module:
     #     python -m tests.degradation_test