diff --git a/.github/scripts/smoke_install.sh b/.github/scripts/smoke_install.sh
index bc4beef..1de1ee0 100755
--- a/.github/scripts/smoke_install.sh
+++ b/.github/scripts/smoke_install.sh
@@ -7,7 +7,14 @@
 set -e
 
 pip install ./PyAutoNerves ./PyAutoFit ./PyAutoArray ./PyAutoGalaxy
-pip install "jax<0.7" "jaxlib<0.7"
+# NOTE: no jax pin here, deliberately. One lived on this line until it was
+# found to be vestigial: autolens_workspace_test#82 added
+# `jax<0.7 jaxlib<0.7` solely to keep `tensorflow-probability==0.25.0`
+# importable, and autolens_workspace_test#184 removed that
+# dependency when the stack moved to tfp-nightly. jax's supported range is
+# owned by autonerves' base dependencies (jax>=0.7.0,<0.12.0, PyAutoLens#702)
+# and is installed by the line above -- do not restate it here, it drifts.
+# The assertion at the end of this script checks the resolved version.
 pip install "./PyAutoArray[optional]" "./PyAutoGalaxy[optional]"
 # NOTE: do NOT `pip install tensorflow-probability==0.25.0` here. The stable
 # release crashes at import under the resolved modern JAX
@@ -20,3 +27,19 @@ pip install "./PyAutoArray[optional]" "./PyAutoGalaxy[optional]"
 # last time so site-packages has skip_latents() and other recent
 # autonerves APIs available at import time.
 pip install --force-reinstall --no-deps ./PyAutoNerves
+
+# Assert the resolved jax rather than inferring it from a green smoke run. This
+# install previously landed on a supported jax only because the [optional]
+# re-resolution above happened to undo the pin removed here -- correct by line
+# ordering, not by constraint. Reordering these lines now fails loudly at install
+# time instead of silently dropping the smoke suite onto an unsupported jax.
+python - <<'JAXCHECK'
+import jax
+
+major, minor = (int(part) for part in jax.__version__.split(".")[:2])
+assert (0, 7) <= (major, minor) < (0, 12), (
+    f"resolved jax {jax.__version__} is outside autonerves' supported range "
+    "(>=0.7.0,<0.12.0)"
+)
+print(f"resolved jax {jax.__version__}")
+JAXCHECK