diff --git a/package.json b/package.json
index 9d7e16f1e..e38a4c721 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 187e39847..6d755b01c 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 961f0e565..74451a4c8 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 c38c1a158..5feba93fb 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>
diff --git a/yarn.lock b/yarn.lock
index ed22514f4..dd3a50f21 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3492,6 +3492,13 @@ entities@^2.0.0, entities@~2.0.0:
   resolved "https://registry.yarnpkg.com/entities/-/entities-2.0.0.tgz#68d6084cab1b079767540d80e56a39b423e4abf4"
   integrity sha512-D9f7V0JSRwIxlRI2mjMqufDrRDnx8p+eEOz7aUM9SuvF8gsBzra0/6tbjl1m8eQHrZlYj6PxqE00hZ1SAIKPLw==
 
+entity-decode@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/entity-decode/-/entity-decode-2.0.2.tgz#e4f807e52c3294246e9347d1f2b02b07fd5f92e7"
+  integrity sha512-5CCY/3ci4MC1m2jlumNjWd7VBFt4VfFnmSqSNmVcXq4gxM3Vmarxtt+SvmBnzwLS669MWdVuXboNVj1qN2esVg==
+  dependencies:
+    he "^1.1.1"
+
 env-variable@0.0.x:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/env-variable/-/env-variable-0.0.6.tgz#74ab20b3786c545b62b4a4813ab8cf22726c9808"
@@ -4692,7 +4699,7 @@ he@1.1.1:
   resolved "https://registry.yarnpkg.com/he/-/he-1.1.1.tgz#93410fd21b009735151f8868c2f271f3427e23fd"
   integrity sha1-k0EP0hsAlzUVH4howvJx80J+I/0=
 
-he@^1.2.0:
+he@^1.1.1, he@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"
   integrity sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==
@@ -6288,19 +6295,19 @@ merge-descriptors@1.0.1:
   resolved "https://registry.yarnpkg.com/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
   integrity sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E=
 
-mermaid@~8.4.6:
-  version "8.4.7"
-  resolved "https://registry.yarnpkg.com/mermaid/-/mermaid-8.4.7.tgz#1af8f6bece99f022a514471c42b80cabf7706501"
-  integrity sha512-mj4mefncBd8y921auvsXMN5MbVqzkrXyCUPz1AbVdQ+W6XKO27Oyqnor4ZO2hlqlosJc+Dl273V+SJBmX5PTNw==
+mermaid@~8.5.1:
+  version "8.5.1"
+  resolved "https://registry.yarnpkg.com/mermaid/-/mermaid-8.5.1.tgz#c3b3a39d14315c8b00ba43c047101c2d7cf463f1"
+  integrity sha512-CU8jEceILn/zS5Fs6CxxAIilhXoQd9b3Hy/UR/ZIioK75yyLf8f+V8WX2Voq4oaXiwExCwYUcBA9WV4oyr31wA==
   dependencies:
     "@braintree/sanitize-url" "^3.1.0"
     crypto-random-string "^3.0.1"
     d3 "^5.7.0"
     dagre "^0.8.4"
     dagre-d3 "^0.6.4"
+    entity-decode "^2.0.2"
     graphlib "^2.1.7"
     he "^1.2.0"
-    lodash "^4.17.11"
     minify "^4.1.1"
     moment-mini "^2.22.1"
     scope-css "^1.2.1"