diff --git a/docs/tutorial.rst b/docs/tutorial.rst
index 87c4a20103..b94cf3fa1c 100644
--- a/docs/tutorial.rst
+++ b/docs/tutorial.rst
@@ -809,7 +809,7 @@ Another storage alternative is the :class:`zarr.storage.DBMStore` class, added
 in Zarr version 2.2. This class allows any DBM-style database to be used for
 storing an array or group. Here is an example using a Berkeley DB B-tree
 database for storage (requires `bsddb3
-<https://www.jcea.es/programacion/pybsddb.htm>`_ to be installed)::
+<https://www.jcea.es/programacion/pybsddb.htm>`_ to be installed):
 
 .. doctest-requires:: bsddb3
 
diff --git a/pyproject.toml b/pyproject.toml
index 36a9492c52..c9a929d7e5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,6 +43,7 @@ docs = [
     'pydata-sphinx-theme',
     'numpydoc',
     'numcodecs[msgpack]!=0.14.0',
+    'pytest-doctestplus',
 ]
 
 [project.urls]
diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index df1d4fd793..a2d23a7841 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -15,7 +15,7 @@ pymongo==4.10.1
 # optional test requirements
 coverage
 pytest-cov==5.0.0
-pytest-doctestplus==1.2.1
+pytest-doctestplus==1.3.0
 pytest-timeout==2.3.1
 h5py==3.12.1
 fsspec==2023.12.2
diff --git a/zarr/storage.py b/zarr/storage.py
index 7e5e966bc1..2c6bb16c08 100644
--- a/zarr/storage.py
+++ b/zarr/storage.py
@@ -2067,7 +2067,7 @@ class DBMStore(Store):
     A different database library can be used by passing a different function to
     the `open` parameter. For example, if the `bsddb3
     <https://www.jcea.es/programacion/pybsddb.htm>`_ package is installed, a
-    Berkeley DB database can be used::
+    Berkeley DB database can be used:
 
     .. doctest-requires:: bsddb3