diff --git a/digdag-ui/package-lock.json b/digdag-ui/package-lock.json
index 5b7721c4b9..b61598c286 100644
--- a/digdag-ui/package-lock.json
+++ b/digdag-ui/package-lock.json
@@ -101,7 +101,7 @@
         "less": "2.7.2",
         "less-loader": "4.1.0",
         "mini-css-extract-plugin": "^0.5.0",
-        "postcss": "^8.4.14",
+        "postcss": "^8.4.31",
         "postcss-loader": "^4.2.0",
         "resolve-url-loader": "^2.3.1",
         "rimraf": "^2.6.1",
@@ -15493,10 +15493,16 @@
       "optional": true
     },
     "node_modules/nanoid": {
-      "version": "3.3.4",
-      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.4.tgz",
-      "integrity": "sha512-MqBkQh/OHTS2egovRtLk45wEyNXwF+cokD+1YPf9u5VfJiRdAiRwB2froX5Co9Rh20xs4siNPm8naNotSD6RBw==",
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",
+      "integrity": "sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA==",
       "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
       "bin": {
         "nanoid": "bin/nanoid.cjs"
       },
@@ -16429,9 +16435,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.4.14",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.14.tgz",
-      "integrity": "sha512-E398TUmfAYFPBSdzgeieK2Y1+1cpdxJx8yXbK/m57nRhKSmk1GB2tO4lbLBtlkfPQTDKfe4Xqv1ASWPpayPEig==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "dev": true,
       "funding": [
         {
@@ -16441,10 +16447,14 @@
         {
           "type": "tidelift",
           "url": "https://tidelift.com/funding/github/npm/postcss"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
         }
       ],
       "dependencies": {
-        "nanoid": "^3.3.4",
+        "nanoid": "^3.3.6",
         "picocolors": "^1.0.0",
         "source-map-js": "^1.0.2"
       },
@@ -33987,9 +33997,9 @@
       "optional": true
     },
     "nanoid": {
-      "version": "3.3.4",
-      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.4.tgz",
-      "integrity": "sha512-MqBkQh/OHTS2egovRtLk45wEyNXwF+cokD+1YPf9u5VfJiRdAiRwB2froX5Co9Rh20xs4siNPm8naNotSD6RBw==",
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",
+      "integrity": "sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA==",
       "dev": true
     },
     "nanomatch": {
@@ -34727,12 +34737,12 @@
       "dev": true
     },
     "postcss": {
-      "version": "8.4.14",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.14.tgz",
-      "integrity": "sha512-E398TUmfAYFPBSdzgeieK2Y1+1cpdxJx8yXbK/m57nRhKSmk1GB2tO4lbLBtlkfPQTDKfe4Xqv1ASWPpayPEig==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "dev": true,
       "requires": {
-        "nanoid": "^3.3.4",
+        "nanoid": "^3.3.6",
         "picocolors": "^1.0.0",
         "source-map-js": "^1.0.2"
       }
diff --git a/digdag-ui/package.json b/digdag-ui/package.json
index 9aba039823..79cc709d1a 100644
--- a/digdag-ui/package.json
+++ b/digdag-ui/package.json
@@ -110,7 +110,7 @@
     "less": "2.7.2",
     "less-loader": "4.1.0",
     "mini-css-extract-plugin": "^0.5.0",
-    "postcss": "^8.4.14",
+    "postcss": "^8.4.31",
     "postcss-loader": "^4.2.0",
     "resolve-url-loader": "^2.3.1",
     "rimraf": "^2.6.1",