diff --git a/package-lock.json b/package-lock.json
index bcf6f9a..95c1cfd 100644
--- a/package-lock.json
+++ b/package-lock.json
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-      "dev": true,
-      "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
-        "window-size": "0.1.0"
-      }
-    },
     "yargs-parser": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
@@ -8770,6 +8543,7 @@
       "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.9.1.tgz",
       "integrity": "sha1-qBmB6nCleUYTOIPwKcWCGok1mn8=",
       "dev": true,
+      "optional": true,
       "requires": {
         "buffer-crc32": "0.2.13",
         "fd-slicer": "1.0.1"
diff --git a/package.json b/package.json
index f987985..83287bf 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "gulp-rename": "^1.4.0",
     "gulp-sass": "^4.0.2",
     "gulp-sass-lint": "^1.3.4",
-    "gulp.spritesmith": "^6.9.0",
+    "gulp.spritesmith": "^6.12.1",
     "merge-stream": "^1.0.1",
     "sass-lint": "^1.12.1",
     "vinyl-buffer": "^1.0.1"