diff --git a/bmi_topography/api_key.py b/bmi_topography/api_key.py
index 286147f..50b1649 100644
--- a/bmi_topography/api_key.py
+++ b/bmi_topography/api_key.py
@@ -7,7 +7,6 @@
 
 
 class ApiKey:
-
     """Store an API key to use when fetching topography data from OpenTopography.
 
     Parameters
diff --git a/bmi_topography/bbox.py b/bmi_topography/bbox.py
index 73298f2..c5c7a75 100644
--- a/bmi_topography/bbox.py
+++ b/bmi_topography/bbox.py
@@ -3,7 +3,6 @@
 
 
 class BoundingBox:
-
     """Represent a simple latitude-longitude bounding box.
 
     Examples
diff --git a/bmi_topography/bmi.py b/bmi_topography/bmi.py
index ea61da6..fbdf008 100644
--- a/bmi_topography/bmi.py
+++ b/bmi_topography/bmi.py
@@ -17,7 +17,6 @@
 
 
 class BmiTopography(Bmi):
-
     """BMI-mediated access to NASA SRTM land elevation data."""
 
     _name = "bmi-topography"
diff --git a/bmi_topography/cli.py b/bmi_topography/cli.py
index 4bbf24a..ba23961 100644
--- a/bmi_topography/cli.py
+++ b/bmi_topography/cli.py
@@ -1,4 +1,5 @@
 """Command-line interface for bmi-topography """
+
 import click
 
 from .topography import Topography
diff --git a/bmi_topography/errors.py b/bmi_topography/errors.py
index 981864b..56cfcc1 100644
--- a/bmi_topography/errors.py
+++ b/bmi_topography/errors.py
@@ -1,26 +1,22 @@
 class BmiTopographyError(Exception):
-
     """Base exception for all bmi_topography errors."""
 
     pass
 
 
 class MissingKeyError(BmiTopographyError):
-
     """Raise if an API key cannot be found."""
 
     pass
 
 
 class BadKeyError(BmiTopographyError):
-
     """Raise for an invalid key."""
 
     pass
 
 
 class BadApiKeySource(BmiTopographyError):
-
     """Raise for an invalid API key source."""
 
     pass
diff --git a/bmi_topography/topography.py b/bmi_topography/topography.py
index ea05622..c3116d3 100644
--- a/bmi_topography/topography.py
+++ b/bmi_topography/topography.py
@@ -1,4 +1,5 @@
 """Base class to access elevation data"""
+
 import os
 import urllib
 import warnings
@@ -14,7 +15,6 @@
 
 
 class Topography:
-
     """Fetch and cache land elevation data from OpenTopography."""
 
     SCHEME = "https"
diff --git a/examples/bmi-topography_ex.py b/examples/bmi-topography_ex.py
index eb45280..1cefbcd 100644
--- a/examples/bmi-topography_ex.py
+++ b/examples/bmi-topography_ex.py
@@ -1,4 +1,5 @@
 """An example used in the README and documentation."""
+
 import matplotlib.pyplot as plt
 
 from bmi_topography import Topography
diff --git a/tests/test_bbox.py b/tests/test_bbox.py
index 8d918eb..8e07f81 100644
--- a/tests/test_bbox.py
+++ b/tests/test_bbox.py
@@ -1,4 +1,5 @@
 """Test BoundingBox class"""
+
 import pytest
 
 from bmi_topography import BoundingBox, Topography
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 696cd67..fe0a880 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,4 +1,5 @@
 """Test bmi-topography command-line interface"""
+
 import pathlib
 
 from click.testing import CliRunner
diff --git a/tests/test_config.py b/tests/test_config.py
index 0c48db5..5a2145f 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -1,4 +1,5 @@
 """Test config file"""
+
 import yaml
 
 from bmi_topography import Topography
diff --git a/tests/test_topography.py b/tests/test_topography.py
index 8400350..9c1d99d 100644
--- a/tests/test_topography.py
+++ b/tests/test_topography.py
@@ -1,4 +1,5 @@
 """Test Topography class"""
+
 import os
 
 import pytest