diff --git a/package.json b/package.json
index dc7d1938..2c952c45 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "prettier": "^1.14.3",
     "request": "^2.88.0",
     "rimraf": "^2.6.2",
-    "terser": "^3.8.2",
+    "terser": "^4.8.1",
     "through2": "^2.0.3",
     "uglify-js": "^3.4.9",
     "util.promisify": "^1.0.0"
diff --git a/yarn.lock b/yarn.lock
index 95a01e66..56b7c67f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2802,10 +2802,10 @@ combined-stream@~1.0.6:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@^2.14.1, commander@^2.18.0, commander@^2.9.0:
-  version "2.18.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.18.0.tgz#2bf063ddee7c7891176981a2cc798e5754bc6970"
-  integrity sha512-6CYPa+JP2ftfRU2qkDK+UTVeQYosOg/2GbcjIcKPHfinyOLPVGXu/ovN86RP49Re5ndJK1N0kuiidFFuepc4ZQ==
+commander@^2.14.1, commander@^2.18.0, commander@^2.20.0, commander@^2.9.0:
+  version "2.20.3"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
+  integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
 
 commander@~2.17.1:
   version "2.17.1"
@@ -7920,10 +7920,10 @@ source-map-resolve@^0.5.0:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
-source-map-support@^0.5.6, source-map-support@~0.5.6:
-  version "0.5.9"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.9.tgz#41bc953b2534267ea2d605bccfa7bfa3111ced5f"
-  integrity sha512-gR6Rw4MvUlYy83vP0vxoVNzM6t8MUXqNuRsuBmBHQDu1Fh6X015FrLdgoDKcNdkwGubozq0P4N0Q37UyFVr1EA==
+source-map-support@^0.5.6, source-map-support@~0.5.12:
+  version "0.5.21"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.21.tgz#04fe7c7f9e1ed2d662233c28cb2b35b9f63f6e4f"
+  integrity sha512-uBHU3L3czsIyYXKX88fdrGovxdSCoTGDRZ6SYXtSRxLZUzHg5P/66Ht6uoUlHu9EZod+inXhKo3qQgwXUT/y1w==
   dependencies:
     buffer-from "^1.0.0"
     source-map "^0.6.0"
@@ -8309,14 +8309,14 @@ temp-write@^3.4.0:
     temp-dir "^1.0.0"
     uuid "^3.0.1"
 
-terser@^3.8.2:
-  version "3.8.2"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-3.8.2.tgz#48b880f949f8d038aca4dfd00a37c53d96ecf9fb"
-  integrity sha512-FGSBXiBJe2TSXy6pWwXpY0YcEWEK35UKL64BBbxX3aHqM4Nj0RMqXvqBuoSGfyd80t8MKQ5JwYm5jRRGTSEFNg==
+terser@^4.8.1:
+  version "4.8.1"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.1.tgz#a00e5634562de2239fd404c649051bf6fc21144f"
+  integrity sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==
   dependencies:
-    commander "~2.17.1"
+    commander "^2.20.0"
     source-map "~0.6.1"
-    source-map-support "~0.5.6"
+    source-map-support "~0.5.12"
 
 test-exclude@^5.2.3:
   version "5.2.3"