diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index 93ad285..171e999 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -25,7 +25,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      MDBOOK_VERSION: 0.4.36
+      MDBOOK_VERSION: 0.4.40
     steps:
       - uses: actions/checkout@v4
       - name: Install mdBook
diff --git a/.markdownlint.yaml b/.markdownlint.yaml
index 7c63337..8680bfe 100644
--- a/.markdownlint.yaml
+++ b/.markdownlint.yaml
@@ -3,6 +3,5 @@
   "code_blocks": false # Disable rule for hard tabs in code blocks
 "MD013": false # Disable rule for line length
 "MD033": false # Disable rule banning inline HTML
-"MD025": false # Disable rule for multiple top-level headers
 "MD040": false # Disable rule for fenced code blocks
 "MD041": false # Disable rule for first line in file
\ No newline at end of file
diff --git a/cips/SUMMARY.md b/cips/SUMMARY.md
index f1f246c..7dc89a7 100644
--- a/cips/SUMMARY.md
+++ b/cips/SUMMARY.md
@@ -1,7 +1,7 @@
 # Summary
 
 [README.md](../README.md)
-
+<!-- markdownlint-disable MD025 -->
 # CIPs
 
 - [CIP-1](./cip-1.md)