diff --git a/package-lock.json b/package-lock.json
index fa213b8..312c28a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -42,7 +42,7 @@
         "gulp-uglify": "^3.0.2",
         "mocha": "^4.0.1",
         "open": "^6.4.0",
-        "postcss": "^6.0.19",
+        "postcss": "^7.0.36",
         "postcss-url": "^7.3.1",
         "sinon": "^4.1.3",
         "vinyl-buffer": "^1.0.1",
@@ -9221,17 +9221,21 @@
       }
     },
     "node_modules/postcss": {
-      "version": "6.0.23",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.23.tgz",
-      "integrity": "sha512-soOk1h6J3VMTZtVeVpv15/Hpdl2cBLX3CAw4TAbkpTJiNPk9YP/zWcD1ND+xEtvyuuvKzbxliTOIyvkSeSJ6ag==",
+      "version": "7.0.36",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.36.tgz",
+      "integrity": "sha512-BebJSIUMwJHRH0HAQoxN4u1CN86glsrwsW0q7T+/m44eXOUAxSNdHRkNZPYz5vVUbg17hFgOQDE7fZk7li3pZw==",
       "dev": true,
       "dependencies": {
-        "chalk": "^2.4.1",
+        "chalk": "^2.4.2",
         "source-map": "^0.6.1",
-        "supports-color": "^5.4.0"
+        "supports-color": "^6.1.0"
       },
       "engines": {
-        "node": ">=4.0.0"
+        "node": ">=6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/postcss/"
       }
     },
     "node_modules/postcss-url": {
@@ -9247,6 +9251,29 @@
         "xxhashjs": "^0.2.1"
       }
     },
+    "node_modules/postcss-url/node_modules/postcss": {
+      "version": "6.0.23",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.23.tgz",
+      "integrity": "sha512-soOk1h6J3VMTZtVeVpv15/Hpdl2cBLX3CAw4TAbkpTJiNPk9YP/zWcD1ND+xEtvyuuvKzbxliTOIyvkSeSJ6ag==",
+      "dev": true,
+      "dependencies": {
+        "chalk": "^2.4.1",
+        "source-map": "^0.6.1",
+        "supports-color": "^5.4.0"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/postcss-url/node_modules/source-map": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/postcss/node_modules/source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -9256,6 +9283,18 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/postcss/node_modules/supports-color": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+      "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/preserve": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/preserve/-/preserve-0.2.0.tgz",
@@ -21442,14 +21481,14 @@
       "dev": true
     },
     "postcss": {
-      "version": "6.0.23",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.23.tgz",
-      "integrity": "sha512-soOk1h6J3VMTZtVeVpv15/Hpdl2cBLX3CAw4TAbkpTJiNPk9YP/zWcD1ND+xEtvyuuvKzbxliTOIyvkSeSJ6ag==",
+      "version": "7.0.36",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.36.tgz",
+      "integrity": "sha512-BebJSIUMwJHRH0HAQoxN4u1CN86glsrwsW0q7T+/m44eXOUAxSNdHRkNZPYz5vVUbg17hFgOQDE7fZk7li3pZw==",
       "dev": true,
       "requires": {
-        "chalk": "^2.4.1",
+        "chalk": "^2.4.2",
         "source-map": "^0.6.1",
-        "supports-color": "^5.4.0"
+        "supports-color": "^6.1.0"
       },
       "dependencies": {
         "source-map": {
@@ -21457,6 +21496,15 @@
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
           "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
           "dev": true
+        },
+        "supports-color": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
         }
       }
     },
@@ -21471,6 +21519,25 @@
         "mkdirp": "^0.5.0",
         "postcss": "^6.0.1",
         "xxhashjs": "^0.2.1"
+      },
+      "dependencies": {
+        "postcss": {
+          "version": "6.0.23",
+          "resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.23.tgz",
+          "integrity": "sha512-soOk1h6J3VMTZtVeVpv15/Hpdl2cBLX3CAw4TAbkpTJiNPk9YP/zWcD1ND+xEtvyuuvKzbxliTOIyvkSeSJ6ag==",
+          "dev": true,
+          "requires": {
+            "chalk": "^2.4.1",
+            "source-map": "^0.6.1",
+            "supports-color": "^5.4.0"
+          }
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
       }
     },
     "preserve": {
diff --git a/package.json b/package.json
index 182228b..75022c1 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "gulp-uglify": "^3.0.2",
     "mocha": "^4.0.1",
     "open": "^6.4.0",
-    "postcss": "^6.0.19",
+    "postcss": "^7.0.36",
     "postcss-url": "^7.3.1",
     "sinon": "^4.1.3",
     "vinyl-buffer": "^1.0.1",