diff --git a/pattern-af-tutorial/client/package-lock.json b/pattern-af-tutorial/client/package-lock.json
index 739cd32..0769e01 100644
--- a/pattern-af-tutorial/client/package-lock.json
+++ b/pattern-af-tutorial/client/package-lock.json
@@ -8817,6 +8817,11 @@
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     },
+    "immutable": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-4.1.0.tgz",
+      "integrity": "sha512-oNkuqVTA8jqG1Q6c+UglTOD1xhC1BtjKI7XkCXRkZHrN5m18/XsnUp8Q89GkQO/z+0WjonSvl0FLhDYftp46nQ=="
+    },
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       "resolved": "https://registry.npmjs.org/import-cwd/-/import-cwd-2.1.0.tgz",
@@ -15272,11 +15277,13 @@
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     "sass": {
-      "version": "1.42.1",
-      "resolved": "https://registry.npmjs.org/sass/-/sass-1.42.1.tgz",
-      "integrity": "sha512-/zvGoN8B7dspKc5mC6HlaygyCBRvnyzzgD5khiaCfglWztY99cYoiTUksVx11NlnemrcfH5CEaCpsUKoW0cQqg==",
+      "version": "1.55.0",
+      "resolved": "https://registry.npmjs.org/sass/-/sass-1.55.0.tgz",
+      "integrity": "sha512-Pk+PMy7OGLs9WaxZGJMn7S96dvlyVBwwtToX895WmCpAOr5YiJYEUJfiJidMuKb613z2xNWcXCHEuOvjZbqC6A==",
       "requires": {
-        "chokidar": ">=3.0.0 <4.0.0"
+        "chokidar": ">=3.0.0 <4.0.0",
+        "immutable": "^4.0.0",
+        "source-map-js": ">=0.6.2 <2.0.0"
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diff --git a/pattern-af-tutorial/client/package.json b/pattern-af-tutorial/client/package.json
index c644d4f..ffc74f4 100644
--- a/pattern-af-tutorial/client/package.json
+++ b/pattern-af-tutorial/client/package.json
@@ -19,7 +19,7 @@
     "react-scripts": "4.0.1",
     "react-toastify": "^5.1.0",
     "recharts": "^2.0.9",
-    "sass": "^1.42.1",
+    "sass": "^1.55.0",
     "socket.io-client": "^2.2.0",
     "typescript": "^4.3.2"
   },