diff --git a/package-lock.json b/package-lock.json
index 30a62cc..8a374e9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -417,6 +417,11 @@
         "through": "2"
       }
     },
+    "sprintf-js": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.2.tgz",
+      "integrity": "sha512-VE0SOVEHCk7Qc8ulkWw3ntAzXuqf7S2lvwQaDLRnUeIEaKNQJzV6BwmLKhOqT61aGhfUMrXeaBk+oDGCzvhcug=="
+    },
     "stream-combiner": {
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.2.2.tgz",
@@ -450,9 +455,18 @@
       }
     },
     "underscore.string": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.2.3.tgz",
-      "integrity": "sha1-gGmSYzZl1eX8tNsfs6hi62jp5to="
+      "version": "3.3.5",
+      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.5.tgz",
+      "integrity": "sha512-g+dpmgn+XBneLmXXo+sGlW5xQEt4ErkS3mgeN2GFbremYeMBSJKr9Wf2KJplQVaiPY/f7FN6atosWYNm9ovrYg==",
+      "requires": {
+        "sprintf-js": "^1.0.3",
+        "util-deprecate": "^1.0.2"
+      }
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "wrappy": {
       "version": "1.0.2",
diff --git a/package.json b/package.json
index aa54811..0a1d7e6 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "shelljs": "^0.7.4",
     "path": "^0.11.14",
     "ps-tree": "1.0.0",
-    "underscore.string": "~3.2",
+    "underscore.string": "~3.3",
     "ansi-to-html": "~0.3",
     "fs-plus": "^2.8.0",
     "loophole": "^1.1.0"