diff --git a/docs/build_old_docs.py b/docs/build_old_docs.py
index e5218d07f..e988f150d 100755
--- a/docs/build_old_docs.py
+++ b/docs/build_old_docs.py
@@ -64,7 +64,7 @@ def apply_patches_for_release(release: str, repo_path: Path) -> None:
         sp.run(("git", "-C", str(repo_path), "am", str(patch_path)), check=True)
 
 
-def build_docs_for_release(release: str, repo_path: Path, outdir: Path) -> None:
+def build_docs_for_release(release: str, repo_path: Path, outdir: Path) -> Path:
     """Build documentation for a given release."""
     print(f"Building docs for {release}")
     release_path = add_worktree_for_release(repo_path, release)
@@ -72,6 +72,9 @@ def build_docs_for_release(release: str, repo_path: Path, outdir: Path) -> None:
     # Apply patches, if any
     apply_patches_for_release(release, release_path)
 
+    # Copy current theme into the release worktree so theme is consistent
+    shutil.copytree(REPO_ROOT / "theme", release_path / "theme", dirs_exist_ok=True)
+
     # Build docs
     sp.run(("just", f"{release_path!s}/build-docs"), check=True)
 
@@ -86,6 +89,8 @@ def build_docs_for_release(release: str, repo_path: Path, outdir: Path) -> None:
     print(f"Copying to {release_outdir}")
     shutil.move((release_path / "book"), release_outdir)
 
+    return release_outdir
+
 
 def build_old_docs() -> None:
     """Build documentation for previous releases."""
@@ -98,8 +103,14 @@ def build_old_docs() -> None:
         clone_repo_to(repo_path)
 
         # Generate documentation for each previous release
-        for release in get_releases():
-            build_docs_for_release(release, repo_path, outdir)
+        for i, release in enumerate(get_releases()):
+            release_outdir = build_docs_for_release(release, repo_path, outdir)
+
+            # Copy latest release into stable dir
+            if i == 0:
+                stable_dir = outdir / "stable"
+                shutil.rmtree(stable_dir, ignore_errors=True)
+                shutil.copytree(release_outdir, stable_dir)
 
 
 if __name__ == "__main__":
diff --git a/docs/templates/versions.md.jinja b/docs/templates/versions.md.jinja
index 6e5a84c64..838a91c0c 100644
--- a/docs/templates/versions.md.jinja
+++ b/docs/templates/versions.md.jinja
@@ -3,6 +3,7 @@
 The MUSE2 documentation for different releases is available below.
 
 - [Current development version](index.html)
+- [Stable version](release/stable/index.html)
 {%- for release in releases %}
 - [{{ release }}](release/{{ release }}/index.html)
 {%- endfor %}
diff --git a/theme/header.hbs b/theme/header.hbs
new file mode 100644
index 000000000..7063a5a77
--- /dev/null
+++ b/theme/header.hbs
@@ -0,0 +1,56 @@
+<style>
+  :root { --banner-height: 36px; }
+
+  #version-banner {
+    display: none;
+    position: fixed;
+    top: 0; left: 0; right: 0;
+    height: var(--banner-height);
+    z-index: 9999;
+    align-items: center;
+    justify-content: center;
+    font-size: 0.875em;
+    box-sizing: border-box;
+    padding: 0 16px;
+  }
+</style>
+
+<div id="version-banner" role="status" aria-live="polite"></div>
+
+<script>
+  (function () {
+    var path = window.location.pathname;
+    var banner = document.getElementById("version-banner");
+
+    var isStable = /\/release\/stable\//.test(path);
+    if (isStable) return;
+
+    var versionMatch = /\/release\/(v[\d.]+)\//.exec(path);
+    var isDev = !versionMatch;
+
+    if (isDev) {
+      banner.innerHTML =
+        "This is the <strong>\u00a0development version\u00a0</strong> of the MUSE2 documentation.";
+      banner.style.backgroundColor = "#fff3cd";
+      banner.style.borderBottom = "1px solid #ffc107";
+      banner.style.color = "#664d03";
+    } else {
+      var version = versionMatch[1];
+      banner.innerHTML =
+        "You are viewing docs for <strong>\u00a0" + version + "\u00a0</strong> of MUSE2. " +
+        "This is not the latest version.";
+      banner.style.backgroundColor = "#f8d7da";
+      banner.style.borderBottom = "1px solid #f5c2c7";
+      banner.style.color = "#842029";
+    }
+
+    banner.style.display = "flex";
+
+    var s = document.createElement("style");
+    s.textContent =
+      "body { padding-top: var(--banner-height); }" +
+      "#mdbook-menu-bar.sticky { top: var(--banner-height) !important; }" +
+      "#mdbook-sidebar { top: var(--banner-height) !important; height: calc(100vh - var(--banner-height)) !important; }";
+    document.head.appendChild(s);
+  })();
+</script>