diff --git a/package.json b/package.json
index a4f01a0..0199302 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
   "license": "MIT",
   "dependencies": {
     "@slack/bolt": "^3.7.0",
-    "dotenv": "^10.0.0",
+    "dotenv": "^16.4.7",
     "textlint": "^12.0.2",
     "textlint-rule-preset-smarthr": "1.5.0"
   },
diff --git a/yarn.lock b/yarn.lock
index 3b86ce8..62a147c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1296,10 +1296,10 @@ dot-prop@^5.2.0:
   dependencies:
     is-obj "^2.0.0"
 
-dotenv@^10.0.0:
-  version "10.0.0"
-  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-10.0.0.tgz#3d4227b8fb95f81096cdd2b66653fb2c7085ba81"
-  integrity sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q==
+dotenv@^16.4.7:
+  version "16.4.7"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-16.4.7.tgz#0e20c5b82950140aa99be360a8a5f52335f53c26"
+  integrity sha512-47qPchRCykZC03FhkYAhrvwU4xDBFIj1QPqaarj6mdM/hgUzfPHcpkHJOn3mJAufFeeAxAzeGsr5X0M4k6fLZQ==
 
 doublearray@0.0.2:
   version "0.0.2"