diff --git a/package.json b/package.json
index be408b94..483ce81e 100644
--- a/package.json
+++ b/package.json
@@ -77,7 +77,7 @@
     "rollup-plugin-terser": "^7.0.2",
     "rollup-plugin-typescript2": "^0.27.2",
     "semver": "^7.3.2",
-    "serve": "^11.3.0",
+    "serve": "^12.0.0",
     "ts-jest": "^26.2.0",
     "typescript": "^4.2.2",
     "yorkie": "^2.0.0"
diff --git a/yarn.lock b/yarn.lock
index 6db8290c..f66481b7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1002,17 +1002,7 @@ aggregate-error@^3.0.0:
     clean-stack "^2.0.0"
     indent-string "^4.0.0"
 
-ajv@6.5.3:
-  version "6.5.3"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.5.3.tgz#71a569d189ecf4f4f321224fecb166f071dd90f9"
-  integrity sha512-LqZ9wY+fx3UMiiPd741yB2pj3hhil+hQc8taf4o2QGRFpWgZ2V5C8HA165DY9sS3fJwsk7uT7ZlFEyC3Ig3lLg==
-  dependencies:
-    fast-deep-equal "^2.0.1"
-    fast-json-stable-stringify "^2.0.0"
-    json-schema-traverse "^0.4.1"
-    uri-js "^4.2.2"
-
-ajv@^6.10.0, ajv@^6.12.3, ajv@^6.12.4, ajv@~6.12.6:
+ajv@6.12.6, ajv@^6.10.0, ajv@^6.12.3, ajv@^6.12.4, ajv@~6.12.6:
   version "6.12.6"
   resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.12.6.tgz#baf5a62e802b07d977034586f8c3baf5adf26df4"
   integrity sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==
@@ -1096,7 +1086,7 @@ anymatch@^3.0.3, anymatch@~3.1.1:
     normalize-path "^3.0.0"
     picomatch "^2.0.4"
 
-arch@^2.1.0:
+arch@^2.1.1:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/arch/-/arch-2.2.0.tgz#1bc47818f305764f23ab3306b0bfc086c5a29d11"
   integrity sha512-Of/R0wqp83cgHozfIYLbBMnej79U/SVGOOyuB3VVFv1NRM/PSFMK12x9KVtiYzJqmnU5WR2qp0Z5rHb7sWGnFQ==
@@ -1744,13 +1734,14 @@ cli-truncate@^2.1.0:
     slice-ansi "^3.0.0"
     string-width "^4.2.0"
 
-clipboardy@1.2.3:
-  version "1.2.3"
-  resolved "https://registry.yarnpkg.com/clipboardy/-/clipboardy-1.2.3.tgz#0526361bf78724c1f20be248d428e365433c07ef"
-  integrity sha512-2WNImOvCRe6r63Gk9pShfkwXsVtKCroMAevIbiae021mS850UkWPbevxsBz3tnvjZIEGvlwaqCPsw+4ulzNgJA==
+clipboardy@2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/clipboardy/-/clipboardy-2.3.0.tgz#3c2903650c68e46a91b388985bc2774287dba290"
+  integrity sha512-mKhiIL2DrQIsuXMgBgnfEHOZOryC7kY7YO//TN6c63wlEm3NG5tz+YgY5rVi29KCmq/QQjKYvM7a19+MDOTHOQ==
   dependencies:
-    arch "^2.1.0"
-    execa "^0.8.0"
+    arch "^2.1.1"
+    execa "^1.0.0"
+    is-wsl "^2.1.1"
 
 cliui@^6.0.0:
   version "6.0.0"
@@ -2831,11 +2822,6 @@ extsprintf@^1.2.0:
   resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.4.0.tgz#e2689f8f356fad62cca65a3a91c5df5f9551692f"
   integrity sha1-4mifjzVvrWLMplo6kcXfX5VRaS8=
 
-fast-deep-equal@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
-  integrity sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=
-
 fast-deep-equal@^3.1.1, fast-deep-equal@^3.1.3:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
@@ -3821,7 +3807,7 @@ is-windows@^1.0.2:
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
   integrity sha512-eXK1UInq2bPmjyX6e3VHIzMLobc4J94i4AWn+Hpq3OU5KkrRC96OAcR3PRJ/pGu6m8TRnBHP9dkXQVsT/COVIA==
 
-is-wsl@^2.2.0:
+is-wsl@^2.1.1, is-wsl@^2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-2.2.0.tgz#74a4c76e77ca9fd3f932f290c17ea326cd157271"
   integrity sha512-fKzAra0rGJUUBwGBgNkHZuToZcn+TtXHpeCgmkMJMMYx1sQDYaCSyjJBSCa2nH1DGm7s3n1oBnohoVTBaN7Lww==
@@ -6424,17 +6410,17 @@ serve-handler@6.1.3:
     path-to-regexp "2.2.1"
     range-parser "1.2.0"
 
-serve@^11.3.0:
-  version "11.3.2"
-  resolved "https://registry.yarnpkg.com/serve/-/serve-11.3.2.tgz#b905e980616feecd170e51c8f979a7b2374098f5"
-  integrity sha512-yKWQfI3xbj/f7X1lTBg91fXBP0FqjJ4TEi+ilES5yzH0iKJpN5LjNb1YzIfQg9Rqn4ECUS2SOf2+Kmepogoa5w==
+serve@^12.0.0:
+  version "12.0.0"
+  resolved "https://registry.yarnpkg.com/serve/-/serve-12.0.0.tgz#122962f712b57660059de9d109c82599280e4949"
+  integrity sha512-BkTsETQYynAZ7rXX414kg4X6EvuZQS3UVs1NY0VQYdRHSTYWPYcH38nnDh48D0x6ONuislgjag8uKlU2gTBImA==
   dependencies:
     "@zeit/schemas" "2.6.0"
-    ajv "6.5.3"
+    ajv "6.12.6"
     arg "2.0.0"
     boxen "1.3.0"
     chalk "2.4.1"
-    clipboardy "1.2.3"
+    clipboardy "2.3.0"
     compression "1.7.3"
     serve-handler "6.1.3"
     update-check "1.5.2"