diff --git a/package-lock.json b/package-lock.json
index 4d4ca31d..99e69782 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "caver-js",
-  "version": "1.6.5",
+  "version": "1.6.8",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "caver-js",
-      "version": "1.6.5",
+      "version": "1.6.8",
       "license": "LGPL-3.0",
       "dependencies": {
         "@babel/runtime": "7.3.1",
@@ -30,7 +30,7 @@
         "lodash": "4.17.21",
         "mocha": "8.3.2",
         "multihashes": "4.0.2",
-        "node-fetch": "2.6.1",
+        "node-fetch": "2.6.7",
         "number-to-bn": "1.7.0",
         "oboe": "2.1.3",
         "os": "^0.1.2",
@@ -8345,11 +8345,22 @@
       }
     },
     "node_modules/node-fetch": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
-      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==",
+      "version": "2.6.7",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
+      "integrity": "sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==",
+      "dependencies": {
+        "whatwg-url": "^5.0.0"
+      },
       "engines": {
         "node": "4.x || >=6.0.0"
+      },
+      "peerDependencies": {
+        "encoding": "^0.1.0"
+      },
+      "peerDependenciesMeta": {
+        "encoding": {
+          "optional": true
+        }
       }
     },
     "node_modules/node-preload": {
@@ -10470,6 +10481,11 @@
         "node": ">=6"
       }
     },
+    "node_modules/tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o="
+    },
     "node_modules/tsconfig-paths": {
       "version": "3.12.0",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.12.0.tgz",
@@ -10944,6 +10960,11 @@
         "node": ">=10.13.0"
       }
     },
+    "node_modules/webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE="
+    },
     "node_modules/webpack": {
       "version": "5.65.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.65.0.tgz",
@@ -11100,6 +11121,15 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
       "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
     },
+    "node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -17757,9 +17787,12 @@
       }
     },
     "node-fetch": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
-      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw=="
+      "version": "2.6.7",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
+      "integrity": "sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==",
+      "requires": {
+        "whatwg-url": "^5.0.0"
+      }
     },
     "node-preload": {
       "version": "0.2.1",
@@ -19398,6 +19431,11 @@
         }
       }
     },
+    "tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o="
+    },
     "tsconfig-paths": {
       "version": "3.12.0",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.12.0.tgz",
@@ -19795,6 +19833,11 @@
         "graceful-fs": "^4.1.2"
       }
     },
+    "webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE="
+    },
     "webpack": {
       "version": "5.65.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.65.0.tgz",
@@ -19903,6 +19946,15 @@
         }
       }
     },
+    "whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
+      "requires": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
diff --git a/package.json b/package.json
index 514e6b7e..6d7b5295 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,7 @@
     "lodash": "4.17.21",
     "mocha": "8.3.2",
     "multihashes": "4.0.2",
-    "node-fetch": "2.6.1",
+    "node-fetch": "2.6.7",
     "number-to-bn": "1.7.0",
     "oboe": "2.1.3",
     "os": "^0.1.2",