diff --git a/.do/gitnexus/Dockerfile b/.do/gitnexus/Dockerfile
index 58a79e087e..ede0920593 100644
--- a/.do/gitnexus/Dockerfile
+++ b/.do/gitnexus/Dockerfile
@@ -7,13 +7,18 @@
 
 FROM node:24.16.0-slim
 
-ARG GITNEXUS_VERSION=1.5.3
+ARG GITNEXUS_VERSION=1.6.5
+# Pin the native DB to match the index workflow; gitnexus's ^0.16.1 range
+# would otherwise let the served image drift from the CI-produced index.
+ARG LADYBUG_VERSION=0.16.1
 
 # 1. Build native addons with Bookworm toolchain, then remove build tools.
 #    curl stays for the docker healthcheck; Caddy lives in its own container.
+#    LadybugDB is pinned nested under gitnexus so step 3's require() resolves it.
 RUN apt-get update \
     && apt-get install -y --no-install-recommends python3 make g++ curl \
     && npm install -g gitnexus@${GITNEXUS_VERSION} \
+    && npm install --no-save --prefix /usr/local/lib/node_modules/gitnexus "@ladybugdb/core@${LADYBUG_VERSION}" \
     && apt-get purge -y --auto-remove python3 make g++ \
     && rm -rf /var/lib/apt/lists/* /root/.npm
 
@@ -26,17 +31,13 @@ RUN echo "deb http://deb.debian.org/debian trixie main" > /etc/apt/sources.list.
     && rm -rf /var/lib/apt/lists/*
 
 # 3. Pre-install LadybugDB FTS + vector extensions so ~/.kuzu/extension/
-#    is baked into the image. Workaround for upstream GitNexus 1.5.3 bug.
+#    is baked into the image. gitnexus serve loads extensions with a
+#    load-only policy and never installs them at runtime, so the cache
+#    must already exist. (GitNexus 1.6.5 loads the vector extension itself
+#    via loadVectorExtension — no adapter patch needed.)
 COPY install-extensions.js /tmp/install-extensions.js
 RUN node /tmp/install-extensions.js && rm -rf /tmp/install-extensions.js /tmp/lbug-ext-install
 
-# 4. Patch lbug-adapter.js to also LOAD EXTENSION vector after FTS.
-RUN LBUG_ADAPTER=/usr/local/lib/node_modules/gitnexus/dist/mcp/core/lbug-adapter.js \
-    && grep -q "LOAD EXTENSION fts" "$LBUG_ADAPTER" \
-    && sed -i "s|await available\[0\]\.query('LOAD EXTENSION fts');|await available[0].query('LOAD EXTENSION fts'); try { await available[0].query('LOAD EXTENSION vector'); } catch (e) { /* vector extension may not be installed */ }|g" "$LBUG_ADAPTER" \
-    && grep -c "LOAD EXTENSION vector" "$LBUG_ADAPTER" \
-    && echo "lbug-adapter.js patched to load vector extension"
-
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
diff --git a/.github/workflows/gitnexus-deploy.yml b/.github/workflows/gitnexus-deploy.yml
index 203138c706..f4cd38bb2b 100644
--- a/.github/workflows/gitnexus-deploy.yml
+++ b/.github/workflows/gitnexus-deploy.yml
@@ -84,7 +84,7 @@ concurrency:
   cancel-in-progress: false
 
 env:
-  GITNEXUS_VERSION: '1.5.3'
+  GITNEXUS_VERSION: '1.6.5'
   IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/librechat-gitnexus
 
 jobs:
diff --git a/.github/workflows/gitnexus-index.yml b/.github/workflows/gitnexus-index.yml
index 21c3f69321..26b0a06098 100644
--- a/.github/workflows/gitnexus-index.yml
+++ b/.github/workflows/gitnexus-index.yml
@@ -43,7 +43,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  GITNEXUS_VERSION: '1.5.3'
+  GITNEXUS_VERSION: '1.6.5'
 
 jobs:
   index:
@@ -64,6 +64,9 @@ jobs:
       github.event.pull_request.user.login == 'danny-avila'
     runs-on: ubuntu-latest
     timeout-minutes: 25
+    # Best-effort index: a tool-internal crash must not block PRs. Fail soft on
+    # PR events; push/dispatch runs still fail loudly so regressions stay visible.
+    continue-on-error: ${{ github.event_name == 'pull_request' }}
     steps:
       - name: Validate dispatch inputs
         if: github.event_name == 'workflow_dispatch'
@@ -162,7 +165,7 @@ jobs:
             --no-save \
             --no-package-lock \
             "gitnexus@${{ env.GITNEXUS_VERSION }}" \
-            "@ladybugdb/core@0.15.2"
+            "@ladybugdb/core@0.16.1"
           test -x "$RUNNER_TEMP/gitnexus-cli/node_modules/.bin/gitnexus"
 
       - name: Checkout repository