diff --git a/package.json b/package.json
index feebe75..ab4e95b 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "gulp": "^4.0.0",
     "gulp-aigis": "https://github.com/TakuyaAbe/gulp-aigis#v1.3.1",
     "gulp-changed": "^3.2.0",
-    "gulp-ejs": "^3.2.0",
+    "gulp-ejs": "^4.0.0",
     "gulp-eslint": "^5.0.0",
     "gulp-front-matter": "^1.3.0",
     "gulp-if": "^2.0.2",
diff --git a/yarn.lock b/yarn.lock
index dc0070d..dbcbc44 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5008,15 +5008,14 @@ gulp-decompress@^1.2.0:
     gulp-util "^3.0.1"
     readable-stream "^2.0.2"
 
-gulp-ejs@^3.2.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/gulp-ejs/-/gulp-ejs-3.2.0.tgz#ee6840b6aae285d70a9cd09dbd9badb00bbace86"
-  integrity sha512-UE9GmVJ+u72NRCJcdaJw30nTY42wPST6yWn9MLxIjllotZtSgwijIl5ihw0gEzNgYYaHVnv3DAfj4lyF/Na0Rg==
+gulp-ejs@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/gulp-ejs/-/gulp-ejs-4.0.0.tgz#032e8bde712d2384b7b0135a474554e8425be5c2"
+  integrity sha512-NlLcMJY1S5nNHEznHM+xhgDCUGr0v+Tr1pp78T/x+icgC3GXs71GPDnklLZAKxY0cmfwNRH0aRidapLDSy37KA==
   dependencies:
     ejs "2.6.1"
     plugin-error "^1.0.0"
-    replace-ext "^1.0.0"
-    through2 "2.0.3"
+    through2 "^3.0.1"
 
 gulp-eslint@^5.0.0:
   version "5.0.0"
@@ -9365,6 +9364,15 @@ read-pkg@^3.0.0:
     string_decoder "~1.1.1"
     util-deprecate "~1.0.1"
 
+"readable-stream@2 || 3":
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.3.0.tgz#cb8011aad002eb717bf040291feba8569c986fb9"
+  integrity sha512-EsI+s3k3XsW+fU8fQACLN59ky34AZ14LoeVZpYwmZvldCFo0r0gnelwF2TcMjLor/BTL5aDJVBMkss0dthToPw==
+  dependencies:
+    inherits "^2.0.3"
+    string_decoder "^1.1.1"
+    util-deprecate "^1.0.1"
+
 "readable-stream@>=1.0.33-1 <1.1.0-0", readable-stream@~1.0.17, readable-stream@~1.0.27-1, readable-stream@~1.0.33-1:
   version "1.0.34"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-1.0.34.tgz#125820e34bc842d2f2aaafafe4c2916ee32c157c"
@@ -11158,7 +11166,7 @@ through2-filter@^2.0.0:
     through2 "~2.0.0"
     xtend "~4.0.0"
 
-through2@2.0.3, through2@2.X, through2@^2.0.0, through2@^2.0.1, through2@^2.0.3, through2@~2.0.0:
+through2@2.X, through2@^2.0.0, through2@^2.0.1, through2@^2.0.3, through2@~2.0.0:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
   integrity sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=
@@ -11174,6 +11182,13 @@ through2@^0.6.0, through2@^0.6.1:
     readable-stream ">=1.0.33-1 <1.1.0-0"
     xtend ">=4.0.0 <4.1.0-0"
 
+through2@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/through2/-/through2-3.0.1.tgz#39276e713c3302edf9e388dd9c812dd3b825bd5a"
+  integrity sha512-M96dvTalPT3YbYLaKaCuwu+j06D/8Jfib0o/PxbVt6Amhv3dUAtW6rTV1jPgJSBG83I/e04Y6xkVdVhSRhi0ww==
+  dependencies:
+    readable-stream "2 || 3"
+
 through2@~0.4.1:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/through2/-/through2-0.4.2.tgz#dbf5866031151ec8352bb6c4db64a2292a840b9b"