diff --git a/theme/package.json b/theme/package.json
index 84b3efcbc..24787ec6c 100644
--- a/theme/package.json
+++ b/theme/package.json
@@ -58,7 +58,7 @@
   "dependencies": {
     "@fortawesome/fontawesome-free": "^7.0.1",
     "js-cookie": "^3.0",
-    "js-yaml": "^4.1",
+    "js-yaml": "^5.4",
     "tippy.js": "^6.3"
   }
 }
diff --git a/theme/yarn.lock b/theme/yarn.lock
index d02e6e6d2..f0efbae18 100644
--- a/theme/yarn.lock
+++ b/theme/yarn.lock
@@ -2375,13 +2375,20 @@ js-tokens@^4.0.0:
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
   integrity sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==
 
-js-yaml@^4.1, js-yaml@^4.1.0:
+js-yaml@^4.1.0:
   version "4.3.2"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.3.2.tgz#8e44fb14a2643c59726bb15787b5f1512cb3d3fb"
   integrity sha512-SFNOvSJ+Dgf/9An904Yx+CgSlIPCkIpao4qo51lpee25TIRejdH3rhR4EZMGoNx3/TP3O+wzWuiTFl4sqbltzA==
   dependencies:
     argparse "^2.0.1"
 
+js-yaml@^5.4:
+  version "5.4.2"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-5.4.2.tgz#eebc7a57e0bbe1d6b6d9416a72e7463082c7da85"
+  integrity sha512-m+aqu+LwO1O6sIopafj8HUVl5aawITwZQe/yHpMCKjaWBaA/d07B/QdMb3529REftiU+RMMHL3Vlsw3hON7vWg==
+  dependencies:
+    argparse "^2.0.1"
+
 jsesc@^3.0.2, jsesc@~3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-3.1.0.tgz#74d335a234f67ed19907fdadfac7ccf9d409825d"