diff --git a/ui/package.json b/ui/package.json
index bc15da9e40..e54e1ea127 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -78,7 +78,7 @@
     "ngx-clipboard": "11.1.9",
     "ngx-infinite-scroll": "7.0.1",
     "ngx-markdown": "7.1.2",
-    "prismjs": "1.15.0",
+    "prismjs": "1.21.0",
     "raven-js": "3.27.0",
     "rxjs": "6.3.3",
     "rxjs-compat": "6.3.3",