diff --git a/doc/conf.py b/doc/conf.py
index 35d258ea..90971771 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -79,7 +79,7 @@
 intersphinx_mapping = {
     "python": ("https://docs.python.org/3", None),
     "bluesky": ("https://blueskyproject.io/bluesky/main/", None),
-    "ophyd_async": ("https://blueskyproject.io/ophyd-async/main/", None),
+    "ophyd_async": ("https://blueskyproject.io/ophyd-async/v0.12.3/", None),
     "event_model": ("https://blueskyproject.io/event-model/main/", None),
     "scipp": ("https://scipp.github.io/", None),
     "scippneutron": ("https://scipp.github.io/scippneutron/", None),
diff --git a/pyproject.toml b/pyproject.toml
index 34d1fb65..72086e0d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ classifiers = [
 
 dependencies = [
   "bluesky",  # Bluesky framework
-  "ophyd-async[ca] == 0.12.3",  # Device abstraction
+  "ophyd-async[ca] == 0.12.3",  # Device abstraction. When changing, also change in doc/conf.py
   "matplotlib",  # Plotting
   "lmfit",  # Fitting
   "scipy",  # Definitions of erf/erfc functions