diff --git a/package.json b/package.json
index 5dd44d6..7cdbbf7 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": "^5.6.0",
     "holding": "^3.1.1",
     "fs-extra": "^8.1.0"
   },
diff --git a/yarn.lock b/yarn.lock
index ed4e410..86d64c3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -118,27 +118,32 @@ rollup@^1.32.0:
     "@types/node" "*"
     acorn "^7.1.0"
 
-source-map-support@~0.5.12:
-  version "0.5.16"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.16.tgz#0ae069e7fe3ba7538c64c98515e35339eac5a042"
-  integrity sha512-efyLRJDr68D9hBBNIPWFjhpFzURh+KJykQwvMyW5UiZzYwoF6l4YMMDIJJEyFWxWCqfyxLzz6tSfUFR+kXXsVQ==
+source-map-support@~0.5.19:
+  version "0.5.19"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.19.tgz#a98b62f86dcaf4f67399648c085291ab9e8fed61"
+  integrity sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==
   dependencies:
     buffer-from "^1.0.0"
     source-map "^0.6.0"
 
-source-map@^0.6.0, source-map@~0.6.1:
+source-map@^0.6.0:
   version "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==
+source-map@~0.7.2:
+  version "0.7.3"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.7.3.tgz#5302f8169031735226544092e64981f751750383"
+  integrity sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==
+
+terser@^5.6.0:
+  version "5.6.0"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-5.6.0.tgz#138cdf21c5e3100b1b3ddfddf720962f88badcd2"
+  integrity sha512-vyqLMoqadC1uR0vywqOZzriDYzgEkNJFK4q9GeyOBHIbiECHiWLKcWfbQWAUaPfxkjDhapSlZB9f7fkMrvkVjA==
   dependencies:
     commander "^2.20.0"
-    source-map "~0.6.1"
-    source-map-support "~0.5.12"
+    source-map "~0.7.2"
+    source-map-support "~0.5.19"
 
 type-detect@^4.0.0, type-detect@^4.0.5:
   version "4.0.8"