diff --git a/package-lock.json b/package-lock.json
index 0734d93..55a5b3f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,14 +1,14 @@
 {
   "name": "javascript-algebra",
-  "version": "1.6.7",
+  "version": "1.7.7",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "1.6.7",
+      "version": "1.7.7",
       "license": "Unlicense",
       "devDependencies": {
-        "@types/node": "^14.14.41",
+        "@types/node": "^15.9.0",
         "babel-eslint": "^10.1.0",
         "eslint": "^7.24.0",
         "eslint-config-standard": "^16.0.2",
@@ -174,9 +174,9 @@
       "dev": true
     },
     "node_modules/@types/node": {
-      "version": "14.14.41",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.41.tgz",
-      "integrity": "sha512-dueRKfaJL4RTtSa7bWeTK1M+VH+Gns73oCgzvYfHZywRCoPSd8EkXBL0mZ9unPTveBn+D9phZBaxuzpwjWkW0g==",
+      "version": "15.9.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-15.9.0.tgz",
+      "integrity": "sha512-AR1Vq1Ei1GaA5FjKL5PBqblTZsL5M+monvGSZwe6sSIdGiuu7Xr/pNwWJY+0ZQuN8AapD/XMB5IzBAyYRFbocA==",
       "dev": true
     },
     "node_modules/acorn": {
@@ -2494,9 +2494,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "14.14.41",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.41.tgz",
-      "integrity": "sha512-dueRKfaJL4RTtSa7bWeTK1M+VH+Gns73oCgzvYfHZywRCoPSd8EkXBL0mZ9unPTveBn+D9phZBaxuzpwjWkW0g==",
+      "version": "15.9.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-15.9.0.tgz",
+      "integrity": "sha512-AR1Vq1Ei1GaA5FjKL5PBqblTZsL5M+monvGSZwe6sSIdGiuu7Xr/pNwWJY+0ZQuN8AapD/XMB5IzBAyYRFbocA==",
       "dev": true
     },
     "acorn": {
diff --git a/package.json b/package.json
index e9e285e..180be60 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
   },
   "homepage": "https://github.com/xaota/javascript-algebra#readme",
   "devDependencies": {
-    "@types/node": "^14.14.41",
+    "@types/node": "^15.9.0",
     "babel-eslint": "^10.1.0",
     "eslint": "^7.24.0",
     "eslint-config-standard": "^16.0.2",