diff --git a/package-lock.json b/package-lock.json
index e662d54..1184fa0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1712,6 +1712,21 @@
         "zone.js": "~0.10.3"
       },
       "dependencies": {
+        "postcss": {
+          "version": "8.3.11",
+          "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.3.11.tgz",
+          "integrity": "sha512-hCmlUAIlUiav8Xdqw3Io4LcpA1DOt7h3LSTAC4G6JGHFFaWzI6qvFt9oilvl8BmkbBRX1IhM90ZAmpk68zccQA==",
+          "requires": {
+            "nanoid": "^3.1.30",
+            "picocolors": "^1.0.0",
+            "source-map-js": "^0.6.2"
+          }
+        },
+        "source-map-js": {
+          "version": "0.6.2",
+          "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-0.6.2.tgz",
+          "integrity": "sha512-/3GptzWzu0+0MBQFrDKzw/DvvMTUORvgY6k6jd/VS6iCR4RDTKWH6v6WPwQoUO8667uQEf9Oe38DxAYWY5F/Ug=="
+        },
         "tslib": {
           "version": "2.2.0",
           "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.2.0.tgz",
@@ -8052,13 +8067,20 @@
       "integrity": "sha1-AerA/jta9xoqbAL+q7jB/vfgDqs="
     },
     "postcss": {
-      "version": "8.3.11",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.3.11.tgz",
-      "integrity": "sha512-hCmlUAIlUiav8Xdqw3Io4LcpA1DOt7h3LSTAC4G6JGHFFaWzI6qvFt9oilvl8BmkbBRX1IhM90ZAmpk68zccQA==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "requires": {
-        "nanoid": "^3.1.30",
+        "nanoid": "^3.3.6",
         "picocolors": "^1.0.0",
-        "source-map-js": "^0.6.2"
+        "source-map-js": "^1.0.2"
+      },
+      "dependencies": {
+        "nanoid": {
+          "version": "3.3.6",
+          "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",
+          "integrity": "sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA=="
+        }
       }
     },
     "postcss-calc": {
@@ -9428,9 +9450,9 @@
       "integrity": "sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ=="
     },
     "source-map-js": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-0.6.2.tgz",
-      "integrity": "sha512-/3GptzWzu0+0MBQFrDKzw/DvvMTUORvgY6k6jd/VS6iCR4RDTKWH6v6WPwQoUO8667uQEf9Oe38DxAYWY5F/Ug=="
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.2.tgz",
+      "integrity": "sha512-R0XvVJ9WusLiqTCEiGCmICCMplcCkIwwR11mOSD9CR5u+IXYdiseeEuXCVAjS54zqwkLcPNnmU4OeJ6tUrWhDw=="
     },
     "source-map-loader": {
       "version": "1.1.3",
diff --git a/package.json b/package.json
index 4f8a5bc..575b8ea 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "karma-coverage-istanbul-reporter": "~3.0.3",
     "karma-jasmine": "~4.0.1",
     "karma-jasmine-html-reporter": "~1.5.4",
-    "postcss": "~8.3.0",
+    "postcss": "~8.4.31",
     "typescript": "~4.1.5",
     "eventsource": "2.0.2"
   }