diff --git a/tox.ini b/tox.ini
index 08b7b09dd..8e7bf9d0c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -105,6 +105,8 @@ deps =
 extras = alchemical-model
 changedir = src/metatrain/experimental/alchemical_model/tests/
 commands =
+    pip install sphericart --force-reinstall --no-build-isolation --no-deps
+    pip install sphericart-torch --force-reinstall --no-build-isolation --no-deps
     pytest {posargs}
 
 [testenv:pet-tests]
@@ -115,6 +117,7 @@ deps =
 extras = pet
 changedir = src/metatrain/experimental/pet/tests/
 commands =
+    pip install "pet @ git+https://github.com/spozdn/pet.git@1a470c4" --force-reinstall --no-build-isolation --no-deps
     pytest {posargs}
 
 [testenv:gap-tests]