diff --git a/package.json b/package.json
index 9d7e16f1..e38a4c72 100644
--- a/package.json
+++ b/package.json
@@ -82,7 +82,7 @@
     "markdown-pdf": "^10.0.0",
     "mathjax": "~2.7.6",
     "mattermost": "^3.4.0",
-    "mermaid": "~8.4.6",
+    "mermaid": "~8.5.1",
     "meta-marked": "git+https://github.com/codimd/meta-marked#semver:^0.4.5",
     "method-override": "^2.3.7",
     "minimist": "^1.2.0",
diff --git a/public/views/codimd/foot.ejs b/public/views/codimd/foot.ejs
index 187e3984..6d755b01 100644
--- a/public/views/codimd/foot.ejs
+++ b/public/views/codimd/foot.ejs
@@ -10,7 +10,7 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-immzXfCGLhnx3Zfi9F/dUcqxEM8K3o3oTFy9Bh6HCwg=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/config/Safe.js" integrity="sha256-0ygBUDksNDXZS4vm5HMNH1a33KUu6QT1cdNTN+ZLF+4=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment-with-locales.min.js" integrity="sha256-vvT7Ok9u6GbfnBPXnbM6FVDEO8E1kTdgHOFZOAXrktA=" crossorigin="anonymous" defer></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.4.6/mermaid.min.js" integrity="sha256-wV/0jM5E/0V+KqyxUio2Ve5OAC/gweTTqdbnRX1fgAE=" crossorigin="anonymous" defer></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.5.1/mermaid.min.js" integrity="sha256-wV/0jM5E/0V+KqyxUio2Ve5OAC/gweTTqdbnRX1fgAE=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/emojify.js/1.1.0/js/emojify.min.js" integrity="sha256-VAB5tAlKBvgaxw8oJ1crWMVbdmBVl4mP/2M8MNRl+4E=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.2/lodash.min.js" integrity="sha256-Cv5v4i4SuYvwRYzIONifZjoc99CkwfncROMSWat1cVA=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.1.1/socket.io.js" integrity="sha256-ji09tECORKvr8xB9iCl8DJ8iNMLriDchC1+p+yt1hSs=" crossorigin="anonymous"></script>
diff --git a/public/views/pretty.ejs b/public/views/pretty.ejs
index 961f0e56..74451a4c 100644
--- a/public/views/pretty.ejs
+++ b/public/views/pretty.ejs
@@ -91,7 +91,7 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-immzXfCGLhnx3Zfi9F/dUcqxEM8K3o3oTFy9Bh6HCwg=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/config/Safe.js" integrity="sha256-0ygBUDksNDXZS4vm5HMNH1a33KUu6QT1cdNTN+ZLF+4=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment-with-locales.min.js" integrity="sha256-vvT7Ok9u6GbfnBPXnbM6FVDEO8E1kTdgHOFZOAXrktA=" crossorigin="anonymous" defer></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.4.6/mermaid.min.js" integrity="sha256-wV/0jM5E/0V+KqyxUio2Ve5OAC/gweTTqdbnRX1fgAE=" crossorigin="anonymous" defer></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.5.1/mermaid.min.js" integrity="sha256-wV/0jM5E/0V+KqyxUio2Ve5OAC/gweTTqdbnRX1fgAE=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/emojify.js/1.1.0/js/emojify.min.js" integrity="sha256-VAB5tAlKBvgaxw8oJ1crWMVbdmBVl4mP/2M8MNRl+4E=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.0.6/handlebars.min.js" integrity="sha256-1O3BtOwnPyyRzOszK6P+gqaRoXHV6JXj8HkjZmPYhCI=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js" integrity="sha256-/BfiIkHlHoVihZdc6TFuj7MmJ0TWcWsMXkeDFwhi0zw=" crossorigin="anonymous" defer></script>
diff --git a/public/views/slide.ejs b/public/views/slide.ejs
index c38c1a15..5feba93f 100644
--- a/public/views/slide.ejs
+++ b/public/views/slide.ejs
@@ -99,7 +99,7 @@
         <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-immzXfCGLhnx3Zfi9F/dUcqxEM8K3o3oTFy9Bh6HCwg=" crossorigin="anonymous" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/config/Safe.js" integrity="sha256-0ygBUDksNDXZS4vm5HMNH1a33KUu6QT1cdNTN+ZLF+4=" crossorigin="anonymous" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment-with-locales.min.js" integrity="sha256-vvT7Ok9u6GbfnBPXnbM6FVDEO8E1kTdgHOFZOAXrktA=" crossorigin="anonymous" defer></script>
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.4.6/mermaid.min.js" integrity="sha256-wV/0jM5E/0V+KqyxUio2Ve5OAC/gweTTqdbnRX1fgAE=" crossorigin="anonymous" defer></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.5.1/mermaid.min.js" integrity="sha256-wV/0jM5E/0V+KqyxUio2Ve5OAC/gweTTqdbnRX1fgAE=" crossorigin="anonymous" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/emojify.js/1.1.0/js/emojify.min.js" integrity="sha256-VAB5tAlKBvgaxw8oJ1crWMVbdmBVl4mP/2M8MNRl+4E=" crossorigin="anonymous" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.0.6/handlebars.min.js" integrity="sha256-1O3BtOwnPyyRzOszK6P+gqaRoXHV6JXj8HkjZmPYhCI=" crossorigin="anonymous" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js" integrity="sha256-/BfiIkHlHoVihZdc6TFuj7MmJ0TWcWsMXkeDFwhi0zw=" crossorigin="anonymous" defer></script>