diff --git a/package-lock.json b/package-lock.json
index 4acd3ffb..32aaff3f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,9 +16,9 @@
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@@ -34,6 +34,18 @@
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@@ -120,9 +132,15 @@
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+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
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@@ -167,9 +185,9 @@
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@@ -182,6 +200,17 @@
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@@ -192,6 +221,12 @@
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@@ -206,20 +241,14 @@
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+      "resolved": "https://registry.npmjs.org/coveralls/-/coveralls-3.0.5.tgz",
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@@ -263,6 +292,19 @@
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+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
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@@ -362,9 +412,9 @@
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@@ -409,6 +459,21 @@
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@@ -490,6 +555,21 @@
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+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
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@@ -544,12 +642,12 @@
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-        "graceful-fs": "^4.1.2",
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@@ -565,6 +663,21 @@
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+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
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+    },
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+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
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@@ -588,9 +701,9 @@
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-      "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
+      "version": "4.2.0",
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@@ -655,9 +768,9 @@
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-      "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
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@@ -718,6 +831,18 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-2.0.0.tgz",
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@@ -728,6 +853,12 @@
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@@ -736,6 +867,12 @@
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@@ -814,16 +951,16 @@
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+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
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+    },
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       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz",
@@ -1191,9 +1546,9 @@
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+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
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@@ -1207,6 +1562,33 @@
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+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+      "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+      "dev": true
+    },
+    "set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
+      "dev": true
+    },
+    "shebang-command": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
+      "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
+      "dev": true,
+      "requires": {
+        "shebang-regex": "^1.0.0"
+      }
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+    "shebang-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
+      "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.3.0.tgz",
@@ -1214,9 +1596,9 @@
       "dev": true
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-      "resolved": "https://registry.npmjs.org/should/-/should-13.1.3.tgz",
-      "integrity": "sha512-1m8FHuNTrJ37pXfjfhjmv1/jBw2eYZIWibQ1pH2EGYhn8TcPOSK6zjNbhF20sZ4Gc0XSIlSaSGupnYRKkk1pKQ==",
+      "version": "13.2.3",
+      "resolved": "https://registry.npmjs.org/should/-/should-13.2.3.tgz",
+      "integrity": "sha512-ggLesLtu2xp+ZxI+ysJTmNjh2U0TsC+rQ/pfED9bUZZ4DKefP27D+7YJVVTvKsmjLpIi9jAa7itwDGkDDmt1GQ==",
       "dev": true,
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@@ -1252,9 +1634,9 @@
       "dev": true
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-      "resolved": "https://registry.npmjs.org/should-type-adaptors/-/should-type-adaptors-1.0.1.tgz",
-      "integrity": "sha1-7+VVPN9oz/ZuXF9RtxLcNRx3vqo=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/should-type-adaptors/-/should-type-adaptors-1.1.0.tgz",
+      "integrity": "sha512-JA4hdoLnN+kebEp2Vs8eBe9g7uy0zbRo+RMcU0EsNy+R+k049Ki+N5tT5Jagst2g7EAja+euFuoXFCa8vIklfA==",
       "dev": true,
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@@ -1262,9 +1644,15 @@
       }
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-      "resolved": "https://registry.npmjs.org/should-util/-/should-util-1.0.0.tgz",
-      "integrity": "sha1-yYzaN0qmsZDfi6h8mInCtNtiAGM=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/should-util/-/should-util-1.0.1.tgz",
+      "integrity": "sha512-oXF8tfxx5cDk8r2kYqlkUJzZpDBqVY/II2WhvU0n9Y3XYvAYRmeaf1PvvIvTgPnv4KJ+ES5M0PyDq5Jp+Ygy2g==",
+      "dev": true
+    },
+    "signal-exit": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
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@@ -1299,12 +1687,37 @@
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     },
+    "string-width": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "dev": true,
+      "requires": {
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
+      }
+    },
     "string_decoder": {
       "version": "0.10.31",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
       "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
       "dev": true
     },
+    "strip-ansi": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+      "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "^3.0.0"
+      }
+    },
+    "strip-eof": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
+      "dev": true
+    },
     "strip-json-comments": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-1.0.4.tgz",
@@ -1390,9 +1803,9 @@
       }
     },
     "universalify": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.1.tgz",
-      "integrity": "sha1-+nG63UQ3r0wUiEHjs7Fl+enlkLc=",
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
       "dev": true
     },
     "unquote": {
@@ -1444,17 +1857,197 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
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+        "strip-ansi": {
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
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+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
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+      }
+    },
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       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
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+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
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+      "version": "13.2.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
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+        "require-main-filename": "^2.0.0",
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+        "string-width": "^3.0.0",
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+        "y18n": "^4.0.0",
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+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
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+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
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+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
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+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
+      "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.11",
+        "yargs": "^12.0.5"
+      },
+      "dependencies": {
+        "get-caller-file": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+          "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+          "dev": true
+        },
+        "require-main-filename": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+          "dev": true
+        },
+        "yargs": {
+          "version": "12.0.5",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+          "dev": true,
+          "requires": {
+            "cliui": "^4.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^3.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1 || ^4.0.0",
+            "yargs-parser": "^11.1.1"
+          }
+        },
+        "yargs-parser": {
+          "version": "11.1.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 4bd3e527..d05d28c4 100644
--- a/package.json
+++ b/package.json
@@ -52,8 +52,7 @@
     "coa": "^2.0.2",
     "css-select": "^2.0.0",
     "css-select-base-adapter": "^0.1.1",
-    "css-tree": "1.0.0-alpha.28",
-    "css-url-regex": "^1.1.0",
+    "css-tree": "1.0.0-alpha.33",
     "csso": "^3.5.1",
     "js-yaml": "^3.13.1",
     "mkdirp": "~0.5.1",
@@ -64,14 +63,14 @@
     "util.promisify": "~1.0.0"
   },
   "devDependencies": {
-    "coveralls": "^3.0.3",
-    "fs-extra": "~4.0.3",
+    "coveralls": "^3.0.5",
+    "fs-extra": "~8.1.0",
     "istanbul": "~0.4.5",
-    "jshint": "~2.9.5",
-    "mocha": "~4.0.1",
+    "jshint": "~2.10.2",
+    "mocha": "~6.1.4",
     "mocha-istanbul": "~0.3.0",
     "mock-stdin": "~0.3.1",
-    "should": "~13.1.2"
+    "should": "~13.2.3"
   },
   "engines": {
     "node": ">=4.0.0"
diff --git a/plugins/prefixIds.js b/plugins/prefixIds.js
index 906a79b1..cf8efe30 100644
--- a/plugins/prefixIds.js
+++ b/plugins/prefixIds.js
@@ -13,7 +13,6 @@ exports.description = 'prefix IDs';
 
 var path = require('path'),
     csstree = require('css-tree'),
-    cssRx = require('css-url-regex'),
     unquote = require('unquote'),
     collections = require('./_collections.js'),
     referencesProps = collections.referencesProps,
@@ -37,7 +36,7 @@ var matchId = function(urlVal) {
 
 // Matches an url(...) value, captures the URL
 var matchUrl = function(val) {
-    var urlMatches = cssRx().exec(val);
+    var urlMatches = /url\((.*?)\)/gi.exec(val);
     if (urlMatches === null) {
         return false;
     }