diff --git a/package-lock.json b/package-lock.json
index 9ef20a45..f76dc7a4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
         "@wagtail/stylelint-config-wagtail": "^0.6.0",
         "babel-loader": "^9.1.3",
         "copy-webpack-plugin": "^11.0.0",
-        "css-loader": "^6.8.1",
+        "css-loader": "^5.2.7",
         "file-loader": "^6.2.0",
         "mini-css-extract-plugin": "^2.7.6",
         "prettier": "3.0.0",
@@ -1943,29 +1943,49 @@
       }
     },
     "node_modules/css-loader": {
-      "version": "6.8.1",
-      "resolved": "https://registry.npmjs.org/css-loader/-/css-loader-6.8.1.tgz",
-      "integrity": "sha512-xDAXtEVGlD0gJ07iclwWVkLoZOpEvAWaSyf6W18S2pOC//K8+qUDIx8IIT3D+HjnmkJPQeesOPv5aiUaJsCM2g==",
+      "version": "5.2.7",
+      "resolved": "https://registry.npmjs.org/css-loader/-/css-loader-5.2.7.tgz",
+      "integrity": "sha512-Q7mOvpBNBG7YrVGMxRxcBJZFL75o+cH2abNASdibkj/fffYD8qWbInZrD0S9ccI6vZclF3DsHE7njGlLtaHbhg==",
       "dev": true,
       "dependencies": {
         "icss-utils": "^5.1.0",
-        "postcss": "^8.4.21",
+        "loader-utils": "^2.0.0",
+        "postcss": "^8.2.15",
         "postcss-modules-extract-imports": "^3.0.0",
-        "postcss-modules-local-by-default": "^4.0.3",
+        "postcss-modules-local-by-default": "^4.0.0",
         "postcss-modules-scope": "^3.0.0",
         "postcss-modules-values": "^4.0.0",
-        "postcss-value-parser": "^4.2.0",
-        "semver": "^7.3.8"
+        "postcss-value-parser": "^4.1.0",
+        "schema-utils": "^3.0.0",
+        "semver": "^7.3.5"
       },
       "engines": {
-        "node": ">= 12.13.0"
+        "node": ">= 10.13.0"
       },
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/webpack"
       },
       "peerDependencies": {
-        "webpack": "^5.0.0"
+        "webpack": "^4.27.0 || ^5.0.0"
+      }
+    },
+    "node_modules/css-loader/node_modules/schema-utils": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.3.0.tgz",
+      "integrity": "sha512-pN/yOAvcC+5rQ5nERGuwrjLlYvLTbCibnZ1I7B1LaiAz9BRBlE9GMgE/eqV30P7aJQUf7Ddimy/RsbYO/GrVGg==",
+      "dev": true,
+      "dependencies": {
+        "@types/json-schema": "^7.0.8",
+        "ajv": "^6.12.5",
+        "ajv-keywords": "^3.5.2"
+      },
+      "engines": {
+        "node": ">= 10.13.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/webpack"
       }
     },
     "node_modules/css-loader/node_modules/semver": {
@@ -7894,21 +7914,34 @@
       "dev": true
     },
     "css-loader": {
-      "version": "6.8.1",
-      "resolved": "https://registry.npmjs.org/css-loader/-/css-loader-6.8.1.tgz",
-      "integrity": "sha512-xDAXtEVGlD0gJ07iclwWVkLoZOpEvAWaSyf6W18S2pOC//K8+qUDIx8IIT3D+HjnmkJPQeesOPv5aiUaJsCM2g==",
+      "version": "5.2.7",
+      "resolved": "https://registry.npmjs.org/css-loader/-/css-loader-5.2.7.tgz",
+      "integrity": "sha512-Q7mOvpBNBG7YrVGMxRxcBJZFL75o+cH2abNASdibkj/fffYD8qWbInZrD0S9ccI6vZclF3DsHE7njGlLtaHbhg==",
       "dev": true,
       "requires": {
         "icss-utils": "^5.1.0",
-        "postcss": "^8.4.21",
+        "loader-utils": "^2.0.0",
+        "postcss": "^8.2.15",
         "postcss-modules-extract-imports": "^3.0.0",
-        "postcss-modules-local-by-default": "^4.0.3",
+        "postcss-modules-local-by-default": "^4.0.0",
         "postcss-modules-scope": "^3.0.0",
         "postcss-modules-values": "^4.0.0",
-        "postcss-value-parser": "^4.2.0",
-        "semver": "^7.3.8"
+        "postcss-value-parser": "^4.1.0",
+        "schema-utils": "^3.0.0",
+        "semver": "^7.3.5"
       },
       "dependencies": {
+        "schema-utils": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.3.0.tgz",
+          "integrity": "sha512-pN/yOAvcC+5rQ5nERGuwrjLlYvLTbCibnZ1I7B1LaiAz9BRBlE9GMgE/eqV30P7aJQUf7Ddimy/RsbYO/GrVGg==",
+          "dev": true,
+          "requires": {
+            "@types/json-schema": "^7.0.8",
+            "ajv": "^6.12.5",
+            "ajv-keywords": "^3.5.2"
+          }
+        },
         "semver": {
           "version": "7.5.4",
           "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
diff --git a/package.json b/package.json
index 9a4989e2..a02f8b43 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "@wagtail/stylelint-config-wagtail": "^0.6.0",
     "babel-loader": "^9.1.3",
     "copy-webpack-plugin": "^11.0.0",
-    "css-loader": "^6.8.1",
+    "css-loader": "^5.2.7",
     "file-loader": "^6.2.0",
     "mini-css-extract-plugin": "^2.7.6",
     "prettier": "3.0.0",