diff --git a/package-lock.json b/package-lock.json
index b1cefa4f..0c444544 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2242,7 +2242,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -2272,9 +2272,9 @@
       }
     },
     "cssesc": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/cssesc/-/cssesc-2.0.0.tgz",
-      "integrity": "sha512-MsCAG1z9lPdoO/IUMLSBWBSVxVtJ1395VGIQ+Fc2gNdkQ1hNDnQdw3YhA71WJCBW1vdwA0cAnk/DnW6bqoEUYg=="
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cssesc/-/cssesc-3.0.0.tgz",
+      "integrity": "sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg=="
     },
     "cssom": {
       "version": "0.3.4",
@@ -8420,11 +8420,11 @@
       }
     },
     "postcss-selector-parser": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-5.0.0.tgz",
-      "integrity": "sha512-w+zLE5Jhg6Liz8+rQOWEAwtwkyqpfnmsinXjXg6cY7YIONZZtgvE0v2O0uhQBs0peNomOJwWRKt6JBfTdTd3OQ==",
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.2.tgz",
+      "integrity": "sha512-36P2QR59jDTOAiIkqEprfJDsoNrvwFei3eCqKd1Y0tUsBimsq39BLp7RD+JWny3WgB1zGhJX8XVePwm9k4wdBg==",
       "requires": {
-        "cssesc": "^2.0.0",
+        "cssesc": "^3.0.0",
         "indexes-of": "^1.0.1",
         "uniq": "^1.0.1"
       }
diff --git a/package.json b/package.json
index dfe399c6..1f63a799 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "lodash": "^4.17.11",
     "postcss-media-query-parser": "^0.2.3",
     "postcss-resolve-nested-selector": "^0.1.1",
-    "postcss-selector-parser": "^5.0.0",
+    "postcss-selector-parser": "^6.0.2",
     "postcss-value-parser": "^3.3.1"
   },
   "devDependencies": {