diff --git a/.gitignore b/.gitignore
index 1f26598..89531ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,6 @@
 /OWSLib-0.21.0.tar.gz
 /OWSLib-0.25.0.tar.gz
 /OWSLib-0.26.0.tar.gz
+/OWSLib-0.27.2.tar.gz
+/OWSLib-0.28.0.tar.gz
+/OWSLib-0.28.1.tar.gz
diff --git a/python-OWSLib.spec b/python-OWSLib.spec
index 17f2445..a646079 100644
--- a/python-OWSLib.spec
+++ b/python-OWSLib.spec
@@ -5,11 +5,11 @@
 %bcond_without doc_pdf
 
 Name:           python-OWSLib
-Version:        0.26.0
+Version:        0.28.1
 Release:        %autorelease
 Summary:        Client library for OGC web services
 
-License:        BSD
+License:        BSD-3-Clause
 URL:            https://geopython.github.io/OWSLib
 Source0:        https://github.com/geopython/OWSLib/archive/%{version}/OWSLib-%{version}.tar.gz
 
@@ -24,7 +24,7 @@ BuildRequires:  latexmk
 BuildRequires:  pandoc
 %endif
 
-%global common_description %{expand: \
+%global common_description %{expand:
 OWSLib is a Python package for client programming with Open Geospatial
 Consortium (OGC) web service (hence OWS) interface standards, and their related
 content models.
@@ -34,8 +34,7 @@ Full documentation is available at http://geopython.github.io/OWSLib
 OWSLib provides a common API for accessing service metadata and wrappers for
 numerous OGC Web Service interfaces.}
 
-%description
-%{common_description}
+%description %{common_description}
 
 
 %package -n python3-OWSLib
@@ -43,8 +42,7 @@ Summary:        %{summary}
 
 %py_provides python3-owslib
 
-%description -n python3-OWSLib
-%{common_description}
+%description -n python3-OWSLib %{common_description}
 
 
 %package doc
@@ -67,7 +65,10 @@ sed -r -i 's/[-]-cov[^[:blank:]]*[[:blank:]][^[[:blank:]]+//g' tox.ini
 #
 # Don’t generate twine dependency, which is just for the upstream maintainer
 # uploading to PyPI.
-sed -r '/^(flake8|pytest-cov|pandoc|coverage|coveralls|twine)\b/d' \
+sed -r -e '/^(flake8|pytest-cov|pandoc|coverage|coveralls|twine)\b/d' \
+%if %{without doc_pdf}
+    -e '/^(ipykernel|nbconvert|.*sphinx)/d' \
+%endif
     requirements-dev.txt | tee requirements-dev-filtered.txt
 
 # We don’t need shebangs in the examples. The pattern of selecting files
@@ -83,13 +84,9 @@ chmod -v a-x examples/*.py
 # notebook errors when building documentation.
 echo 'nbsphinx_allow_errors = True' >> docs/conf.py
 
-# Revert “Revert to previous pyproj version”
-# https://github.com/geopython/OWSLib/pull/807
-sed -r -i 's/(pyproj[[:blank:]]*)<[[:blank:]]*3\.3\.0/\1>=2/' requirements.txt
-
 
 %generate_buildrequires
-%pyproject_buildrequires -r requirements-dev-filtered.txt
+%pyproject_buildrequires requirements-dev-filtered.txt
 
 
 %build
@@ -121,8 +118,8 @@ k="${k-}${k+ and }not wfs1_generic.txt"
 k="${k-}${k+ and }not wcs_thredds.txt"
 k="${k-}${k+ and }not test_wmts_example_informatievlaanderen"
 
-# This is a trivial error where the representation of the expected TypeEror has
-# changed over time:
+# This is a trivial error where the representation of the expected TypeError
+# has changed over time:
 # Differences (unified diff with -expected +actual):
 #     @@ -1,3 +1,6 @@
 #      Traceback (most recent call last):
@@ -148,7 +145,6 @@ k="${k-}${k+ and } not (TestOffline and test_wms_130_remotemd_parse_single)"
 
 %files -n python3-OWSLib -f %{pyproject_files}
 # pyproject_files handles LICENSE; verify with “rpm -qL -p …”
-
 %doc AUTHORS.rst
 %doc CHANGES.rst
 %doc README.rst
diff --git a/sources b/sources
index f8d8dcd..6ddf3e6 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (OWSLib-0.26.0.tar.gz) = 27362c47eae87dc6318d505dd1b0987de36d140d2d0fd5d7a5195470de39d73807fbcafa142366f6981cc36453c262a41133c6c68baf45a97d0fdaae5a0ebf4b
+SHA512 (OWSLib-0.28.1.tar.gz) = bd62a5e371e64e0e256cc83d2f044294c20965f6b107b0dd9074ac752971620f01af4c7fc9a82e43dc81e71a6a36696b75403012841c28925b017d9c47b2d4a5