diff --git a/packages/backend/package.json b/packages/backend/package.json
index ffaf52bdcf..e3e8bae8dc 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -37,7 +37,7 @@
 		"autwh": "0.1.0",
 		"aws-sdk": "2.1213.0",
 		"bcryptjs": "2.4.3",
-		"blurhash": "2.0.0",
+		"blurhash": "1.1.5",
 		"bull": "4.9.0",
 		"cacheable-lookup": "6.1.0",
 		"cbor": "8.1.0",
diff --git a/packages/backend/yarn.lock b/packages/backend/yarn.lock
index 0c03713afe..2419a58f66 100644
--- a/packages/backend/yarn.lock
+++ b/packages/backend/yarn.lock
@@ -2318,10 +2318,10 @@ bluebird@~3.4.1:
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.4.7.tgz#f72d760be09b7f76d08ed8fae98b289a8d05fab3"
   integrity sha1-9y12C+Cbf3bQjtj66Ysomo0F+rM=
 
-blurhash@2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/blurhash/-/blurhash-2.0.0.tgz#c2e6392043d5355241cf9ddaec9359023ea57a40"
-  integrity sha512-fdEZnyJZ5E5s9neCfZUMSMkKfMtdKz1fG53t/iYvMjUFUsDnyZ1YnRRayKBK/B8cilNwe5gaIrPF8QlLrukEZQ==
+blurhash@1.1.5:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/blurhash/-/blurhash-1.1.5.tgz#3034104cd5dce5a3e5caa871ae2f0f1f2d0ab566"
+  integrity sha512-a+LO3A2DfxTaTztsmkbLYmUzUeApi0LZuKalwbNmqAHR6HhJGMt1qSV/R3wc+w4DL28holjqO3Bg74aUGavGjg==
 
 bn.js@^4.0.0:
   version "4.11.8"
diff --git a/packages/client/package.json b/packages/client/package.json
index 340bd73b92..d3cd099bcc 100644
--- a/packages/client/package.json
+++ b/packages/client/package.json
@@ -19,7 +19,7 @@
 		"@vue/compiler-sfc": "3.2.39",
 		"autobind-decorator": "2.4.0",
 		"autosize": "5.0.1",
-		"blurhash": "2.0.0",
+		"blurhash": "1.1.5",
 		"broadcast-channel": "4.17.0",
 		"browser-image-resizer": "git+https://github.com/misskey-dev/browser-image-resizer#v2.2.1-misskey.2",
 		"chart.js": "3.9.1",
diff --git a/packages/client/yarn.lock b/packages/client/yarn.lock
index ec3a6031bb..d9c83d89e8 100644
--- a/packages/client/yarn.lock
+++ b/packages/client/yarn.lock
@@ -835,10 +835,10 @@ bluebird@3.7.2, bluebird@^3.7.2:
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.7.2.tgz#9f229c15be272454ffa973ace0dbee79a1b0c36f"
   integrity sha512-XpNj6GDQzdfW+r2Wnn7xiSAd7TM3jzkxGXBGTtWKuSXv1xUV+azxAm8jdWZN06QTQk+2N2XB9jRDkvbmQmcRtg==
 
-blurhash@2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/blurhash/-/blurhash-2.0.0.tgz#c2e6392043d5355241cf9ddaec9359023ea57a40"
-  integrity sha512-fdEZnyJZ5E5s9neCfZUMSMkKfMtdKz1fG53t/iYvMjUFUsDnyZ1YnRRayKBK/B8cilNwe5gaIrPF8QlLrukEZQ==
+blurhash@1.1.5:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/blurhash/-/blurhash-1.1.5.tgz#3034104cd5dce5a3e5caa871ae2f0f1f2d0ab566"
+  integrity sha512-a+LO3A2DfxTaTztsmkbLYmUzUeApi0LZuKalwbNmqAHR6HhJGMt1qSV/R3wc+w4DL28holjqO3Bg74aUGavGjg==
 
 boolbase@^1.0.0:
   version "1.0.0"