diff --git a/package.json b/package.json
index 6751714..7317b59 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "mocha-typescript": "1.1.17",
     "nyc": "13.3.0",
     "remark-stringify": "7.0.4",
-    "source-map-support": "0.5.11",
+    "source-map-support": "0.5.21",
     "ts-node": "8.1.1",
     "typescript": "3.3.3333",
     "unified": "7.1.0"
diff --git a/yarn.lock b/yarn.lock
index d3ed670..222d174 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6999,15 +6999,7 @@ source-map-resolve@^0.5.0:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
-source-map-support@0.5.11:
-  version "0.5.11"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.11.tgz#efac2ce0800355d026326a0ca23e162aeac9a4e2"
-  integrity sha512-//sajEx/fGL3iw6fltKMdPvy8kL3kJ2O3iuYlRoT3k9Kb4BjOoZ+BZzaNHeuaruSt+Kf3Zk9tnfAQg9/AJqUVQ==
-  dependencies:
-    buffer-from "^1.0.0"
-    source-map "^0.6.0"
-
-source-map-support@^0.5.16, source-map-support@^0.5.6:
+source-map-support@0.5.21, source-map-support@^0.5.16, source-map-support@^0.5.6:
   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==