diff --git a/package-lock.json b/package-lock.json
index c608bef..9d9be8f 100644
--- a/package-lock.json
+++ b/package-lock.json
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+            "camelcase": "^5.0.0",
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-        "fd-slicer": "1.1.0"
+        "buffer-crc32": "~0.2.3",
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diff --git a/package.json b/package.json
index 52707bb..52cd1df 100644
--- a/package.json
+++ b/package.json
@@ -30,9 +30,9 @@
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     "gulp-autoprefixer": "^7.0.1",
     "gulp-concat": "^2.6.1",
-    "gulp-csso": "^2.0.0",
+    "gulp-csso": "^3.0.1",
     "gulp-minify": "^3.1.0",
-    "gulp-sass": "^3.1.0",
+    "gulp-sass": "^4.0.2",
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     "node-sass-tilde-importer": "0.0.4",
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