diff --git a/package-lock.json b/package-lock.json
index 6542403c..6f2472d0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "Stylus",
-  "version": "1.5.6",
+  "version": "1.5.7",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1215,7 +1215,7 @@
     },
     "bl": {
       "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
+      "resolved": "http://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
       "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
       "dev": true,
       "requires": {
@@ -3010,7 +3010,7 @@
     },
     "es6-promisify": {
       "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
       "integrity": "sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=",
       "dev": true,
       "requires": {
@@ -5665,7 +5665,7 @@
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "dev": true,
       "requires": {
@@ -5911,7 +5911,7 @@
         },
         "chalk": {
           "version": "0.4.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-0.4.0.tgz",
+          "resolved": "http://registry.npmjs.org/chalk/-/chalk-0.4.0.tgz",
           "integrity": "sha1-UZmj3c0MHv4jvAjBsCewYXbgxk8=",
           "dev": true,
           "requires": {
@@ -5922,7 +5922,7 @@
         },
         "strip-ansi": {
           "version": "0.1.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-0.1.1.tgz",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-0.1.1.tgz",
           "integrity": "sha1-OeipjQRNFQZgq+SmgIrPcLt7yZE=",
           "dev": true
         }
@@ -7601,7 +7601,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
     },