diff --git a/package-lock.json b/package-lock.json
index 8acb229..1348175 100644
--- a/package-lock.json
+++ b/package-lock.json
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-        "css-url-regex": "^1.1.0",
-        "csso": "^3.5.1",
-        "js-yaml": "^3.12.0",
+        "css-tree": "1.0.0-alpha.37",
+        "csso": "^4.0.2",
+        "js-yaml": "^3.13.1",
         "mkdirp": "~0.5.1",
         "object.values": "^1.1.0",
         "sax": "~1.2.4",
@@ -5865,12 +6002,67 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "util.promisify": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
-      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.1.tgz",
+      "integrity": "sha512-g9JpC/3He3bm38zsLupWryXHoEcS22YHthuPQSJdMy6KNrzIRzWqcsHzD/WUnqe45whVou4VIsPew37DoXWNrA==",
       "requires": {
-        "define-properties": "^1.1.2",
-        "object.getownpropertydescriptors": "^2.0.3"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.2",
+        "has-symbols": "^1.0.1",
+        "object.getownpropertydescriptors": "^2.1.0"
+      },
+      "dependencies": {
+        "es-abstract": {
+          "version": "1.17.4",
+          "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.4.tgz",
+          "integrity": "sha512-Ae3um/gb8F0mui/jPL+QiqmglkUsaQf7FwBEHYIFkztkneosu9imhqHpBzQ3h1vit8t5iQ74t6PEVvphBZiuiQ==",
+          "requires": {
+            "es-to-primitive": "^1.2.1",
+            "function-bind": "^1.1.1",
+            "has": "^1.0.3",
+            "has-symbols": "^1.0.1",
+            "is-callable": "^1.1.5",
+            "is-regex": "^1.0.5",
+            "object-inspect": "^1.7.0",
+            "object-keys": "^1.1.1",
+            "object.assign": "^4.1.0",
+            "string.prototype.trimleft": "^2.1.1",
+            "string.prototype.trimright": "^2.1.1"
+          }
+        },
+        "es-to-primitive": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+          "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
+          "requires": {
+            "is-callable": "^1.1.4",
+            "is-date-object": "^1.0.1",
+            "is-symbol": "^1.0.2"
+          }
+        },
+        "has-symbols": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.1.tgz",
+          "integrity": "sha512-PLcsoqu++dmEIZB+6totNFKq/7Do+Z0u4oT0zKOJNl3lYK6vGwwu2hjHs+68OEZbTjiUE9bgOABXbP/GvrS0Kg=="
+        },
+        "is-callable": {
+          "version": "1.1.5",
+          "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.5.tgz",
+          "integrity": "sha512-ESKv5sMCJB2jnHTWZ3O5itG+O128Hsus4K4Qh1h2/cgn2vbgnLSVqfV46AeJA9D5EeeLa9w81KUXMtn34zhX+Q=="
+        },
+        "is-regex": {
+          "version": "1.0.5",
+          "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.5.tgz",
+          "integrity": "sha512-vlKW17SNq44owv5AQR3Cq0bQPEb8+kF3UKZ2fiZNOWtztYE5i0CzCZxFDwO58qAOWtxdBRVO/V5Qin1wjCqFYQ==",
+          "requires": {
+            "has": "^1.0.3"
+          }
+        },
+        "object-keys": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
+          "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA=="
+        }
       }
     },
     "uuid": {
diff --git a/package.json b/package.json
index 68f2855..b9d6b90 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "imagemin-jimp": "github:jaeh/imagemin-jimp",
     "imagemin-mozjpeg": "8.0.0",
     "imagemin-pngquant": "7.0.0",
-    "imagemin-svgo": "7.0.0",
+    "imagemin-svgo": "7.1.0",
     "jimp": "0.6.4",
     "node-zopfli-es": "1.0.3",
     "purify-css": "1.2.5"