diff --git a/requirements-dev.txt b/requirements-dev.txt
index 59339575..ec699788 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,3 +5,4 @@ git+https://github.com/asdf-format/asdf-coordinates-schemas
 git+https://github.com/asdf-format/asdf-wcs-schemas
 git+https://github.com/astropy/astropy
 git+https://github.com/astropy/asdf-astropy
+numpy>=0.0.dev0
diff --git a/tox.ini b/tox.ini
index 95ed7461..fd1784e3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -57,6 +57,8 @@ passenv =
     CI
     CODECOV_*
     DISPLAY
+set_env =
+    dev: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
 args_are_paths = false
 change_dir = pyargs: {homedir}
 extras =
@@ -64,7 +66,6 @@ extras =
     alldeps: all
 deps =
     xdist: pytest-xdist
-    dev: -rrequirements-dev.txt
     cov: pytest-cov
     jwst: jwst[test] @ git+https://github.com/spacetelescope/jwst.git
     romancal: romancal[test] @ git+https://github.com/spacetelescope/romancal.git
@@ -74,6 +75,7 @@ deps =
 pass_env =
     jwst,romancal: CRDS_*
 commands_pre =
+    dev: pip install -r requirements-dev.txt -U --upgrade-strategy eager
     pip freeze
 commands =
     pytest \