diff --git a/website/package.json b/website/package.json
index bec233b..9b4b490 100644
--- a/website/package.json
+++ b/website/package.json
@@ -535,7 +535,7 @@
     "postcss-zindex": "^2.2.0",
     "prepend-http": "^1.0.4",
     "preserve": "^0.2.0",
-    "prismjs": "^1.15.0",
+    "prismjs": "^1.21.0",
     "private": "^0.1.8",
     "process-nextick-args": "^2.0.0",
     "promise": "^7.3.1",
diff --git a/website/yarn.lock b/website/yarn.lock
index 1aea9ee..ed1ff1c 100644
--- a/website/yarn.lock
+++ b/website/yarn.lock
@@ -4352,7 +4352,7 @@ once@^1.3.0, once@^1.4.0:
 
 onetime@^1.0.0, onetime@^1.1.0:
   version "1.1.0"
-  resolved "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz#a1f7838f8314c516f05ecefcbc4ccfe04b4ed789"
+  resolved "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz#a1f7838f8314c516f05ecefcbc4ccfe04b4ed789"
   integrity sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=
 
 onetime@^2.0.0:
@@ -4784,10 +4784,10 @@ preserve@^0.2.0:
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
   integrity sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=
 
-prismjs@^1.15.0:
-  version "1.15.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.15.0.tgz#8801d332e472091ba8def94976c8877ad60398d9"
-  integrity sha512-Lf2JrFYx8FanHrjoV5oL8YHCclLQgbJcVZR+gikGGMqz6ub5QVWDTM6YIwm3BuPxM/LOV+rKns3LssXNLIf+DA==
+prismjs@^1.15.0, prismjs@^1.21.0:
+  version "1.21.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.21.0.tgz#36c086ec36b45319ec4218ee164c110f9fc015a3"
+  integrity sha512-uGdSIu1nk3kej2iZsLyDoJ7e9bnPzIgY0naW/HdknGj61zScaprVEVGHrPoXqI+M9sP0NDnTK2jpkvmldpuqDw==
   optionalDependencies:
     clipboard "^2.0.0"