diff --git a/experiments/perceptual_chunks/package-lock.json b/experiments/perceptual_chunks/package-lock.json
index d569ebd3..0909e9f6 100644
--- a/experiments/perceptual_chunks/package-lock.json
+++ b/experiments/perceptual_chunks/package-lock.json
@@ -2582,9 +2582,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.20",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
-      "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA=="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "lru-cache": {
       "version": "5.1.1",
diff --git a/experiments/perceptual_chunks/package.json b/experiments/perceptual_chunks/package.json
index 5a3ac396..d09dcf73 100644
--- a/experiments/perceptual_chunks/package.json
+++ b/experiments/perceptual_chunks/package.json
@@ -17,7 +17,7 @@
     "express": "^4.16.3",
     "fs": "0.0.1-security",
     "jsonfile": "~2.4.0",
-    "lodash": "^4.17.10",
+    "lodash": "^4.17.21",
     "minimist": "^1.2.0",
     "mkdirp": "^0.5.1",
     "mongodb": "^2.2.35",