diff --git a/package-lock.json b/package-lock.json
index 65f512e..083ea61 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,7 @@
       },
       "devDependencies": {
         "@types/robust-point-in-polygon": "^1.0.0",
-        "sass": "^1.80.6",
+        "sass": "^1.83.0",
         "ts-loader": "^9.5.0",
         "tslint": "^6",
         "typescript": "^4.9.5",
@@ -1297,9 +1297,9 @@
       }
     },
     "node_modules/immutable": {
-      "version": "4.3.4",
-      "resolved": "https://registry.npmjs.org/immutable/-/immutable-4.3.4.tgz",
-      "integrity": "sha512-fsXeu4J4i6WNWSikpI88v/PcVflZz+6kMhUfIwc5SY+poQRPnaf5V7qds6SUyUN3cVxEzuCab7QIoLOQ+DQ1wA==",
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-5.0.3.tgz",
+      "integrity": "sha512-P8IdPQHq3lA1xVeBRi5VPqUm5HDgKnx0Ru51wZz5mjxHr5n3RWhjIpOFU7ybkUxfB+5IToy+OLaHYDBIWsv+uw==",
       "dev": true
     },
     "node_modules/import-local": {
@@ -1859,13 +1859,13 @@
       ]
     },
     "node_modules/sass": {
-      "version": "1.80.6",
-      "resolved": "https://registry.npmjs.org/sass/-/sass-1.80.6.tgz",
-      "integrity": "sha512-ccZgdHNiBF1NHBsWvacvT5rju3y1d/Eu+8Ex6c21nHp2lZGLBEtuwc415QfiI1PJa1TpCo3iXwwSRjRpn2Ckjg==",
+      "version": "1.83.0",
+      "resolved": "https://registry.npmjs.org/sass/-/sass-1.83.0.tgz",
+      "integrity": "sha512-qsSxlayzoOjdvXMVLkzF84DJFc2HZEL/rFyGIKbbilYtAvlCxyuzUeff9LawTn4btVnLKg75Z8MMr1lxU1lfGw==",
       "dev": true,
       "dependencies": {
         "chokidar": "^4.0.0",
-        "immutable": "^4.0.0",
+        "immutable": "^5.0.2",
         "source-map-js": ">=0.6.2 <2.0.0"
       },
       "bin": {
diff --git a/package.json b/package.json
index 9a60db1..9be4ec0 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "license": "MIT",
   "devDependencies": {
     "@types/robust-point-in-polygon": "^1.0.0",
-    "sass": "^1.80.6",
+    "sass": "^1.83.0",
     "ts-loader": "^9.5.0",
     "tslint": "^6",
     "typescript": "^4.9.5",