diff --git a/package.json b/package.json
index 5dd44d6..34aab99 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "rollup": "^1.32.0",
-    "terser": "^4.6.4",
+    "terser": "^5.3.1",
     "holding": "^3.1.1",
     "fs-extra": "^8.1.0"
   },
diff --git a/yarn.lock b/yarn.lock
index ed4e410..891998d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -131,10 +131,10 @@ source-map@^0.6.0, source-map@~0.6.1:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
   integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
 
-terser@^4.6.4:
-  version "4.6.4"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.6.4.tgz#40a0b37afbe5b57e494536815efa68326840fc00"
-  integrity sha512-5fqgBPLgVHZ/fVvqRhhUp9YUiGXhFJ9ZkrZWD9vQtFBR4QIGTnbsb+/kKqSqfgp3WnBwGWAFnedGTtmX1YTn0w==
+terser@^5.3.1:
+  version "5.3.1"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-5.3.1.tgz#f50fe20ab48b15234fe9bdd86b10148ad5fca787"
+  integrity sha512-yD80f4hdwCWTH5mojzxe1q8bN1oJbsK/vfJGLcPZM/fl+/jItIVNKhFIHqqR71OipFWMLgj3Kc+GIp6CeIqfnA==
   dependencies:
     commander "^2.20.0"
     source-map "~0.6.1"