diff --git a/pyproject.toml b/pyproject.toml
index 37b0cb22..5a833bd4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,8 +24,13 @@ classifiers = [
 ]
 keywords = ["cli"]
 dependencies = [
-    "autofit",
-    "autoarray",
+    # Floors, not pins. Without them, pip backtracking the extras chain
+    # (autogalaxy[jax] -> autofit[jax] -> autonerves[jax]) may walk the release
+    # history to 2022: "version X does not provide the extra 'jax'" is a pip
+    # *warning*, not an error, so a pre-extras release is a legal solution.
+    # PyAutoLens#687.
+    "autofit>=2026.7.29.2",
+    "autoarray>=2026.7.29.2",
     "astropy>=5.0,<=7.2.0",
     "nautilus-sampler==1.0.5"
 ]
@@ -51,7 +56,7 @@ jax = [
     # searches (MultiStartAdam / MultiStartProdigy) import. Without it the chain
     # autolens[jax] -> autogalaxy[jax] stopped at autonerves[jax], so `pip
     # install autolens[jax]` left those searches raising ImportError.
-    "autofit[jax]",
+    "autofit[jax]>=2026.7.29.2",
     "jax_zero_contour>=2.0.0,<3.0.0"
 ]
 optional = [