diff --git a/package.json b/package.json
index ff61e03..83e3c88 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "@apextoaster/js-utils": "0.2.1",
     "@istanbuljs/nyc-config-typescript": "1.0.1",
     "@microsoft/api-documenter": "7.8.55",
-    "@microsoft/api-extractor": "7.9.19",
+    "@microsoft/api-extractor": "7.9.21",
     "@types/chai": "4.2.12",
     "@types/chai-as-promised": "7.1.3",
     "@types/js-yaml": "3.12.5",
diff --git a/yarn.lock b/yarn.lock
index 0779932..78727fc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -193,14 +193,6 @@
     js-yaml "~3.13.1"
     resolve "~1.17.0"
 
-"@microsoft/api-extractor-model@7.9.4":
-  version "7.9.4"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/@microsoft/api-extractor-model/-/api-extractor-model-7.9.4.tgz#d0ae8086a4e4961bf65f5225843cde0781ca49d5"
-  integrity sha512-54NM/bqoSVyzRvqDLZkITh0ZTNwIf9aFyYQHJ5LVI7cEqFgc71armtJnI3Gw4GQFhjOJhAccbY31tVUiBbjmgA==
-  dependencies:
-    "@microsoft/tsdoc" "0.12.19"
-    "@rushstack/node-core-library" "3.33.3"
-
 "@microsoft/api-extractor-model@7.9.6":
   version "7.9.6"
   resolved "https://artifacts.apextoaster.com/repository/group-npm/@microsoft/api-extractor-model/-/api-extractor-model-7.9.6.tgz#04a84ffaa51d7b5b2c2cf119326447b4be6fb768"
@@ -209,15 +201,15 @@
     "@microsoft/tsdoc" "0.12.19"
     "@rushstack/node-core-library" "3.33.5"
 
-"@microsoft/api-extractor@7.9.19":
-  version "7.9.19"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/@microsoft/api-extractor/-/api-extractor-7.9.19.tgz#35428ce15081d1277ffcda084d0e799938256861"
-  integrity sha512-oYY5sgsS01NK5/fk34qv9V0tbX4KR9Hw9kVt2lwHMg6seDNq3cO9dcQdroybJfoWYRN0FFvHFVRlY2WqN4afMQ==
+"@microsoft/api-extractor@7.9.21":
+  version "7.9.21"
+  resolved "https://artifacts.apextoaster.com/repository/group-npm/@microsoft/api-extractor/-/api-extractor-7.9.21.tgz#14f00b4fbbd755b3c5ea61a15824fd1584e1a507"
+  integrity sha512-Fdg4zKmE2wgwiiyK39pEVveC2XSYLZLexXwSx+giCe/gNQH1XyLVCP4r+JrubxL3hIPgfbnV1tcYdgtfuEvaCA==
   dependencies:
-    "@microsoft/api-extractor-model" "7.9.4"
+    "@microsoft/api-extractor-model" "7.9.6"
     "@microsoft/tsdoc" "0.12.19"
-    "@rushstack/node-core-library" "3.33.3"
-    "@rushstack/ts-command-line" "4.6.7"
+    "@rushstack/node-core-library" "3.33.5"
+    "@rushstack/ts-command-line" "4.6.9"
     colors "~1.2.1"
     lodash "~4.17.15"
     resolve "~1.17.0"
@@ -267,21 +259,6 @@
     estree-walker "^1.0.1"
     picomatch "^2.2.2"
 
-"@rushstack/node-core-library@3.33.3":
-  version "3.33.3"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/@rushstack/node-core-library/-/node-core-library-3.33.3.tgz#a930515f21ccf941a011f59e1e0060fc3d17ec7b"
-  integrity sha512-4zQgVDMPiniTkRErUzUzW9gY+OeQW/pEccywUoVA9cUAOIkjdj3efwNUbCcVLsPm1uVT0ifgFEqh38pAqAAeZA==
-  dependencies:
-    "@types/node" "10.17.13"
-    colors "~1.2.1"
-    fs-extra "~7.0.1"
-    import-lazy "~4.0.0"
-    jju "~1.4.0"
-    resolve "~1.17.0"
-    semver "~7.3.0"
-    timsort "~0.3.0"
-    z-schema "~3.18.3"
-
 "@rushstack/node-core-library@3.33.5":
   version "3.33.5"
   resolved "https://artifacts.apextoaster.com/repository/group-npm/@rushstack/node-core-library/-/node-core-library-3.33.5.tgz#c751e3e11c29dd4aa407937e847a6b17302d2086"
@@ -297,16 +274,6 @@
     timsort "~0.3.0"
     z-schema "~3.18.3"
 
-"@rushstack/ts-command-line@4.6.7":
-  version "4.6.7"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/@rushstack/ts-command-line/-/ts-command-line-4.6.7.tgz#d16eeb529694b01a17cdf621e908903a5e71a001"
-  integrity sha512-UOEMp3cRPrrNF2yBHBM6uROmkJRrK9NfFS+tOq7jmJTjfoWSS7Esnn+XwFsnBOW7VVmQeLhL+4rKbx6EdXsejg==
-  dependencies:
-    "@types/argparse" "1.0.38"
-    argparse "~1.0.9"
-    colors "~1.2.1"
-    string-argv "~0.3.1"
-
 "@rushstack/ts-command-line@4.6.9":
   version "4.6.9"
   resolved "https://artifacts.apextoaster.com/repository/group-npm/@rushstack/ts-command-line/-/ts-command-line-4.6.9.tgz#dc5e2d002c31e7c5163594d655565191fa9b5989"