diff --git a/package-lock.json b/package-lock.json
index f4635abf..696bb187 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -100,14 +100,14 @@
       }
     },
     "clipboard": {
-      "version": "1.7.1",
-      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-1.7.1.tgz",
-      "integrity": "sha1-Ng1taUbpmnof7zleQrqStem1oWs=",
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-2.0.6.tgz",
+      "integrity": "sha512-g5zbiixBRk/wyKakSwCKd7vQXDjFnAMGHoEyBogG/bw9kTD9GvdAvaoRR1ALcEzt3pVKxZR0pViekPMIS0QyGg==",
       "optional": true,
       "requires": {
-        "good-listener": "1.2.2",
-        "select": "1.1.2",
-        "tiny-emitter": "2.0.2"
+        "good-listener": "^1.2.2",
+        "select": "^1.1.2",
+        "tiny-emitter": "^2.0.0"
       }
     },
     "clone": {
@@ -277,7 +277,7 @@
       "integrity": "sha1-1TswzfkxPf+33JoNR3CWqm0UXFA=",
       "optional": true,
       "requires": {
-        "delegate": "3.2.0"
+        "delegate": "^3.1.2"
       }
     },
     "graceful-fs": {
@@ -630,11 +630,11 @@
       }
     },
     "prismjs": {
-      "version": "1.11.0",
-      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.11.0.tgz",
-      "integrity": "sha1-KXrvM+t5Qhv9sZJzpQkspRWXDSk=",
+      "version": "1.21.0",
+      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.21.0.tgz",
+      "integrity": "sha512-uGdSIu1nk3kej2iZsLyDoJ7e9bnPzIgY0naW/HdknGj61zScaprVEVGHrPoXqI+M9sP0NDnTK2jpkvmldpuqDw==",
       "requires": {
-        "clipboard": "1.7.1"
+        "clipboard": "^2.0.0"
       }
     },
     "qs": {
@@ -738,9 +738,9 @@
       }
     },
     "tiny-emitter": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.0.2.tgz",
-      "integrity": "sha512-2NM0auVBGft5tee/OxP4PI3d8WItkDM+fPnaRAVo6xTDI2knbz9eC5ArWGqtGlYqiH3RU5yMpdyTTO7MguC4ow==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
+      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q==",
       "optional": true
     },
     "toml": {
diff --git a/package.json b/package.json
index 2be828a5..10095a86 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "metalsmith-layouts": "^1.4.2",
     "metalsmith-markdown": "^0.2.1",
     "metalsmith-permalinks": "^0.4.0",
-    "prismjs": "^1.3.0"
+    "prismjs": "^1.21.0"
   },
   "scripts": {
     "start": "./run build-book && ./run serve"