diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2a7907..1e1dc3c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Hermes Web UI -- Changelog
 
+## [v0.50.53] — 2026-04-15
+
+### Fixed
+- **Custom endpoint slash model IDs** — model IDs with vendor prefixes that are intrinsic (e.g. `zai-org/GLM-5.1` on DeepInfra) are now preserved when routing to a custom `base_url` endpoint. Previously, all prefixed IDs were stripped, causing `model_not_found` errors on providers that require the full vendor/model format. Known provider namespaces (`openai/`, `google/`, `anthropic/`, etc.) are still stripped as before. (Fixes #548, PR #549 by @eba8)
+
 ## [v0.50.52] — 2026-04-15
 
 ### Fixed
diff --git a/static/index.html b/static/index.html
index 522466a..63786c1 100644
--- a/static/index.html
+++ b/static/index.html
@@ -553,7 +553,7 @@
                 <div class="settings-section-title">System</div>
                 <div class="settings-section-meta">Instance version and access controls.</div>
               </div>
-              <span class="settings-version-badge">v0.50.52</span>
+              <span class="settings-version-badge">v0.50.53</span>
             </div>
             <div class="settings-field" style="border-top:1px solid var(--border);padding-top:12px;margin-top:8px">
               <label for="settingsPassword" data-i18n="settings_label_password">Access Password</label>