diff --git a/setup.cfg b/setup.cfg
index 7c0b0d9..e5ffda7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -34,6 +34,14 @@ console_scripts =
     case_sparql_select = case_utils.case_sparql_select:main
     case_validate = case_utils.case_validate:main
 
+[options.extras_require]
+testing =
+    PyLD
+    mypy
+    pytest
+    python-dateutil
+    types-python-dateutil
+
 [options.package_data]
 case_utils = py.typed
 case_utils.ontology =
diff --git a/tests/Makefile b/tests/Makefile
index 0716d1a..c1c626e 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -31,8 +31,7 @@ all: \
   $(top_srcdir)/.git_submodule_init.done.log \
   $(top_srcdir)/case_utils/__init__.py \
   $(top_srcdir)/setup.cfg \
-  $(top_srcdir)/setup.py \
-  requirements.txt
+  $(top_srcdir)/setup.py
 	rm -rf venv
 	$(PYTHON3) -m venv \
 	  venv
@@ -42,14 +41,11 @@ all: \
 	    pip \
 	    setuptools \
 	    wheel
-	source venv/bin/activate \
-	  && pip install \
-	    --requirement requirements.txt
 	source venv/bin/activate \
 	  && cd $(top_srcdir) \
 	    && pip install \
 	      --editable \
-	      .
+	      .[testing]
 	touch $@
 
 all-case_utils: \
diff --git a/tests/requirements.txt b/tests/requirements.txt
deleted file mode 100644
index f913d96..0000000
--- a/tests/requirements.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-PyLD
-mypy
-pytest
-python-dateutil
-types-python-dateutil