diff --git a/tox.ini b/tox.ini
index bfb30d1c..b293cf73 100644
--- a/tox.ini
+++ b/tox.ini
@@ -74,6 +74,8 @@ deps =
     -r{toxinidir}/requirements.txt
     .[lib_pydeps]
     deepdiff
+    # deepdiff 8.0 requires numpy, see https://github.com/seperman/deepdiff/issues/478
+    numpy
     httpcore==0.14.7
 commands =
     python -m doctest {[vars]src_path}/charm.py
@@ -121,6 +123,8 @@ description = Run integration tests
 deps =
     aiohttp
     deepdiff
+    # deepdiff 8.0 requires numpy, see https://github.com/seperman/deepdiff/issues/478
+    numpy
     .[lib_pydeps]
     # Libjuju needs to track the juju version
     juju ~= 3.1.0