diff --git a/package-lock.json b/package-lock.json
index c687eae..e59fd57 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,28 +10,9 @@
       "license": "CC-BY-NC-SA-4.0",
       "devDependencies": {
         "pandoc-filter": "^0.1.8",
-        "prismjs": "^1.23.0"
+        "prismjs": "^1.27.0"
       }
     },
-    "node_modules/clipboard": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-2.0.6.tgz",
-      "integrity": "sha512-g5zbiixBRk/wyKakSwCKd7vQXDjFnAMGHoEyBogG/bw9kTD9GvdAvaoRR1ALcEzt3pVKxZR0pViekPMIS0QyGg==",
-      "dev": true,
-      "optional": true,
-      "dependencies": {
-        "good-listener": "^1.2.2",
-        "select": "^1.1.2",
-        "tiny-emitter": "^2.0.0"
-      }
-    },
-    "node_modules/delegate": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/delegate/-/delegate-3.2.0.tgz",
-      "integrity": "sha512-IofjkYBZaZivn0V8nnsMJGBr4jVLxHDheKSW88PyxS5QC4Vo9ZbZVvhzlSxY87fVq3STR6r+4cGepyHkcWOQSw==",
-      "dev": true,
-      "optional": true
-    },
     "node_modules/get-stdin": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-0.1.0.tgz",
@@ -41,16 +22,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/good-listener": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/good-listener/-/good-listener-1.2.2.tgz",
-      "integrity": "sha1-1TswzfkxPf+33JoNR3CWqm0UXFA=",
-      "dev": true,
-      "optional": true,
-      "dependencies": {
-        "delegate": "^3.1.2"
-      }
-    },
     "node_modules/pandoc-filter": {
       "version": "0.1.8",
       "resolved": "https://registry.npmjs.org/pandoc-filter/-/pandoc-filter-0.1.8.tgz",
@@ -64,65 +35,22 @@
       }
     },
     "node_modules/prismjs": {
-      "version": "1.23.0",
-      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.23.0.tgz",
-      "integrity": "sha512-c29LVsqOaLbBHuIbsTxaKENh1N2EQBOHaWv7gkHN4dgRbxSREqDnDbtFJYdpPauS4YCplMSNCABQ6Eeor69bAA==",
+      "version": "1.27.0",
+      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.27.0.tgz",
+      "integrity": "sha512-t13BGPUlFDR7wRB5kQDG4jjl7XeuH6jbJGt11JHPL96qwsEHNX2+68tFXqc1/k+/jALsbSWJKUOT/hcYAZ5LkA==",
       "dev": true,
-      "optionalDependencies": {
-        "clipboard": "^2.0.0"
+      "engines": {
+        "node": ">=6"
       }
-    },
-    "node_modules/select": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/select/-/select-1.1.2.tgz",
-      "integrity": "sha1-DnNQrN7ICxEIUoeG7B1EGNEbOW0=",
-      "dev": true,
-      "optional": true
-    },
-    "node_modules/tiny-emitter": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
-      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q==",
-      "dev": true,
-      "optional": true
     }
   },
   "dependencies": {
-    "clipboard": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-2.0.6.tgz",
-      "integrity": "sha512-g5zbiixBRk/wyKakSwCKd7vQXDjFnAMGHoEyBogG/bw9kTD9GvdAvaoRR1ALcEzt3pVKxZR0pViekPMIS0QyGg==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "good-listener": "^1.2.2",
-        "select": "^1.1.2",
-        "tiny-emitter": "^2.0.0"
-      }
-    },
-    "delegate": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/delegate/-/delegate-3.2.0.tgz",
-      "integrity": "sha512-IofjkYBZaZivn0V8nnsMJGBr4jVLxHDheKSW88PyxS5QC4Vo9ZbZVvhzlSxY87fVq3STR6r+4cGepyHkcWOQSw==",
-      "dev": true,
-      "optional": true
-    },
     "get-stdin": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-0.1.0.tgz",
       "integrity": "sha1-WZivJKr8gC0VyCxoVlfuuLENSpE=",
       "dev": true
     },
-    "good-listener": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/good-listener/-/good-listener-1.2.2.tgz",
-      "integrity": "sha1-1TswzfkxPf+33JoNR3CWqm0UXFA=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "delegate": "^3.1.2"
-      }
-    },
     "pandoc-filter": {
       "version": "0.1.8",
       "resolved": "https://registry.npmjs.org/pandoc-filter/-/pandoc-filter-0.1.8.tgz",
@@ -133,27 +61,10 @@
       }
     },
     "prismjs": {
-      "version": "1.23.0",
-      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.23.0.tgz",
-      "integrity": "sha512-c29LVsqOaLbBHuIbsTxaKENh1N2EQBOHaWv7gkHN4dgRbxSREqDnDbtFJYdpPauS4YCplMSNCABQ6Eeor69bAA==",
-      "dev": true,
-      "requires": {
-        "clipboard": "^2.0.0"
-      }
-    },
-    "select": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/select/-/select-1.1.2.tgz",
-      "integrity": "sha1-DnNQrN7ICxEIUoeG7B1EGNEbOW0=",
-      "dev": true,
-      "optional": true
-    },
-    "tiny-emitter": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
-      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q==",
-      "dev": true,
-      "optional": true
+      "version": "1.27.0",
+      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.27.0.tgz",
+      "integrity": "sha512-t13BGPUlFDR7wRB5kQDG4jjl7XeuH6jbJGt11JHPL96qwsEHNX2+68tFXqc1/k+/jALsbSWJKUOT/hcYAZ5LkA==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 27a9ca2..65b5ddd 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "This repository contains the source code for the **INFO 340: Client-Side Web Development** course book. The published book can be viewed at **https://info340.github.io/**.",
   "devDependencies": {
     "pandoc-filter": "^0.1.8",
-    "prismjs": "^1.23.0"
+    "prismjs": "^1.27.0"
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"