diff --git a/tox.ini b/tox.ini
index b859d32..a3e4dde 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ envlist =
 passenv = HOME,CI,jref
 
 setenv =
-    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/liberfa/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
 
 # Run the tests in a temporary directory to make sure that we don't import
 # package from the source tree
@@ -38,6 +38,7 @@ deps =
     devdeps: scipy>=0.0.dev0
     devdeps: matplotlib>=0.0.dev0
     devdeps: scikit-image>=0.0.dev0
+    devdeps: pyerfa>=0.0.dev0
     devdeps: astropy>=0.0.dev0
     devdeps: git+https://github.com/astropy/photutils.git
     devdeps: git+https://github.com/spacetelescope/ci_watson.git