diff --git a/yarn.lock b/yarn.lock
index 778cc2c..d63c9d8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -667,8 +667,8 @@ browserstack@^1.5.1:
     https-proxy-agent "^2.2.1"
 
 buffer-from@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.0.0.tgz#4cb8832d23612589b0406e9e2956c17f06fdf531"
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.2.tgz#2b146a6fd72e80b4f55d255f35ed59a3a9a41bd5"
 
 buffer-xor@^1.0.3:
   version "1.0.3"
@@ -890,15 +890,9 @@ combined-stream@^1.0.5, combined-stream@~1.0.5:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@^2.11.0, commander@^2.19.0:
-  version "2.20.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
-
-commander@^2.9.0:
-  version "2.10.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.10.0.tgz#e1f5d3245de246d1a5ca04702fa1ad1bd7e405fe"
-  dependencies:
-    graceful-readlink ">= 1.0.0"
+commander@^2.11.0, commander@^2.20.0, commander@^2.9.0:
+  version "2.20.3"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
 
 commondir@^1.0.1:
   version "1.0.1"
@@ -1886,10 +1880,6 @@ graceful-fs@^4.1.2, graceful-fs@^4.1.6:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
-"graceful-readlink@>= 1.0.0":
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
-
 har-schema@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/har-schema/-/har-schema-1.0.5.tgz#d263135f43307c02c602afc8fe95970c0151369e"
@@ -2745,7 +2735,7 @@ neo-async@^2.5.0:
 
 next-tick@1:
   version "1.0.0"
-  resolved "http://registry.npmjs.org/next-tick/-/next-tick-1.0.0.tgz#ca86d1fe8828169b0120208e3dc8424b9db8342c"
+  resolved "https://registry.npmjs.org/next-tick/-/next-tick-1.0.0.tgz#ca86d1fe8828169b0120208e3dc8424b9db8342c"
 
 nice-try@^1.0.4:
   version "1.0.5"
@@ -3717,9 +3707,9 @@ source-map-resolve@^0.5.0:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
-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"
+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"
   dependencies:
     buffer-from "^1.0.0"
     source-map "^0.6.0"
@@ -3730,22 +3720,15 @@ source-map-support@~0.4.0:
   dependencies:
     source-map "^0.5.6"
 
-source-map-support@~0.5.10:
-  version "0.5.12"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.12.tgz#b4f3b10d51857a5af0138d3ce8003b201613d599"
-  dependencies:
-    buffer-from "^1.0.0"
-    source-map "^0.6.0"
-
 source-map-url@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
 
-source-map@0.5.6, source-map@^0.5.6:
+source-map@0.5.6:
   version "0.5.6"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
 
-source-map@^0.5.0:
+source-map@^0.5.0, source-map@^0.5.6:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
@@ -3988,12 +3971,12 @@ terser-webpack-plugin@^1.1.0:
     worker-farm "^1.7.0"
 
 terser@^4.0.0:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.0.2.tgz#580cea06c4932f46a48ed13804c93bc93c275968"
+  version "4.8.1"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.1.tgz#a00e5634562de2239fd404c649051bf6fc21144f"
   dependencies:
-    commander "^2.19.0"
+    commander "^2.20.0"
     source-map "~0.6.1"
-    source-map-support "~0.5.10"
+    source-map-support "~0.5.12"
 
 thenify-all@^1.0.0:
   version "1.6.0"