diff --git a/pyproject.toml b/pyproject.toml
index a714a5db..567062e4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,8 +30,11 @@ keywords = ["cli"]
 # Install it separately with `pip install arcticpy==2.6 --no-build-isolation
 # --no-deps` after installing numpy.
 dependencies = [
-    "autofit",
-    "autoarray",
+    # Floors, not pins — keeps pip from backtracking the PyAuto family into
+    # pre-extras releases when resolving alongside the [jax] chain.
+    # PyAutoLens#687.
+    "autofit>=2026.7.29.2",
+    "autoarray>=2026.7.29.2",
     "nautilus-sampler==1.0.5"
 ]