diff --git a/package-lock.json b/package-lock.json
index f8ce3f6b..acdff43f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
       "devDependencies": {
         "@types/chai": "^4.3.9",
         "@types/mocha": "^10.0.3",
-        "@types/node": "^18.18.6",
+        "@types/node": "^20.8.7",
         "@types/sinon": "^10.0.20",
         "@types/sinon-chai": "^3.2.11",
         "@typescript-eslint/eslint-plugin": "^5.62.0",
@@ -43,7 +43,7 @@
         "typescript": "^5.2.2"
       },
       "engines": {
-        "node": "^14 || ^16 || ^18",
+        "node": "^14 || ^16 || ^18 || ^20.0.0",
         "npm": "^6 || ^7 || ^8 || ^9 || ^10.0.0"
       }
     },
@@ -1603,10 +1603,13 @@
       "dev": true
     },
     "node_modules/@types/node": {
-      "version": "18.18.6",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.18.6.tgz",
-      "integrity": "sha512-wf3Vz+jCmOQ2HV1YUJuCWdL64adYxumkrxtc+H1VUQlnQI04+5HtH+qZCOE21lBE7gIrt+CwX2Wv8Acrw5Ak6w==",
-      "dev": true
+      "version": "20.8.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.8.7.tgz",
+      "integrity": "sha512-21TKHHh3eUHIi2MloeptJWALuCu5H7HQTdTrWIFReA8ad+aggoX+lRes3ex7/FtpC+sVUpFMQ+QTfYr74mruiQ==",
+      "dev": true,
+      "dependencies": {
+        "undici-types": "~5.25.1"
+      }
     },
     "node_modules/@types/normalize-package-data": {
       "version": "2.4.1",
@@ -15247,6 +15250,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/undici-types": {
+      "version": "5.25.3",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.25.3.tgz",
+      "integrity": "sha512-Ga1jfYwRn7+cP9v8auvEXN1rX3sWqlayd4HP7OKk4mZWylEmu3KzXDUGrQUN6Ol7qo1gPvB2e5gX6udnyEPgdA==",
+      "dev": true
+    },
     "node_modules/unicode-emoji-modifier-base": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unicode-emoji-modifier-base/-/unicode-emoji-modifier-base-1.0.0.tgz",
@@ -16885,10 +16894,13 @@
       "dev": true
     },
     "@types/node": {
-      "version": "18.18.6",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.18.6.tgz",
-      "integrity": "sha512-wf3Vz+jCmOQ2HV1YUJuCWdL64adYxumkrxtc+H1VUQlnQI04+5HtH+qZCOE21lBE7gIrt+CwX2Wv8Acrw5Ak6w==",
-      "dev": true
+      "version": "20.8.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.8.7.tgz",
+      "integrity": "sha512-21TKHHh3eUHIi2MloeptJWALuCu5H7HQTdTrWIFReA8ad+aggoX+lRes3ex7/FtpC+sVUpFMQ+QTfYr74mruiQ==",
+      "dev": true,
+      "requires": {
+        "undici-types": "~5.25.1"
+      }
     },
     "@types/normalize-package-data": {
       "version": "2.4.1",
@@ -26873,6 +26885,12 @@
         "which-boxed-primitive": "^1.0.2"
       }
     },
+    "undici-types": {
+      "version": "5.25.3",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.25.3.tgz",
+      "integrity": "sha512-Ga1jfYwRn7+cP9v8auvEXN1rX3sWqlayd4HP7OKk4mZWylEmu3KzXDUGrQUN6Ol7qo1gPvB2e5gX6udnyEPgdA==",
+      "dev": true
+    },
     "unicode-emoji-modifier-base": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unicode-emoji-modifier-base/-/unicode-emoji-modifier-base-1.0.0.tgz",
diff --git a/package.json b/package.json
index db555ec8..ab4387cc 100644
--- a/package.json
+++ b/package.json
@@ -38,13 +38,13 @@
   },
   "homepage": "https://jan-molak.github.io/tiny-types/",
   "engines": {
-    "node": "^14 || ^16 || ^18",
+    "node": "^14 || ^16 || ^18 || ^20.0.0",
     "npm": "^6 || ^7 || ^8 || ^9 || ^10.0.0"
   },
   "devDependencies": {
     "@types/chai": "^4.3.9",
     "@types/mocha": "^10.0.3",
-    "@types/node": "^18.18.6",
+    "@types/node": "^20.8.7",
     "@types/sinon": "^10.0.20",
     "@types/sinon-chai": "^3.2.11",
     "@typescript-eslint/eslint-plugin": "^5.62.0",