diff --git a/package-lock.json b/package-lock.json
index 9c59d0d..fbaffeb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.71",
       "license": "GPL-3.0",
       "dependencies": {
-        "flatted": "^3.2.9",
+        "@ungap/structured-clone": "^1.2.0",
         "riscript": "^1.0.32"
       },
       "devDependencies": {
@@ -526,6 +526,11 @@
         "undici-types": "~5.26.4"
       }
     },
+    "node_modules/@ungap/structured-clone": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@ungap/structured-clone/-/structured-clone-1.2.0.tgz",
+      "integrity": "sha512-zuVdFrMJiuCDQUMCzQaD6KL28MjnqqN8XnAqiEq9PNm/hCPTSGfrXCOfwj1ow4LFb/tNymJPwsNbVePc1xFqrQ=="
+    },
     "node_modules/ansi-colors": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
@@ -1066,11 +1071,6 @@
         "flat": "cli.js"
       }
     },
-    "node_modules/flatted": {
-      "version": "3.2.9",
-      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.2.9.tgz",
-      "integrity": "sha512-36yxDn5H7OFZQla0/jFJmbIKTdZAQHngCedGxiMmpNfEZM0sdEeT+WczLQrjK6D7o2aiyLYDnkw0R3JK0Qv1RQ=="
-    },
     "node_modules/fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
diff --git a/package.json b/package.json
index d8c7af8..4a24b30 100644
--- a/package.json
+++ b/package.json
@@ -7,8 +7,8 @@
   "license": "GPL-3.0",
   "type": "module",
   "scripts": {
-    "test": "NODE_ENV=dev mocha",
-    "test:dist": "NODE_ENV=dev mocha test/dist",
+    "test": "NODE_ENV=dev npx mocha",
+    "test:dist": "NODE_ENV=dev npx mocha test/dist",
     "build": "rm -rf dist/ && npx tsup",
     "types": "npx tsc",
     "pub": "./npnb/source/cli.js --no-release-draft patch",
@@ -52,7 +52,7 @@
     "typescript": "^5.2.2"
   },
   "dependencies": {
-    "flatted": "^3.2.9",
+    "@ungap/structured-clone": "^1.2.0",
     "riscript": "^1.0.32"
   }
 }
diff --git a/src/markov.js b/src/markov.js
index 6b76c77..225de6e 100644
--- a/src/markov.js
+++ b/src/markov.js
@@ -1,4 +1,4 @@
-import { parse, stringify } from 'flatted';
+import { parse, stringify } from '@ungap/structured-clone/json';
 
 /*
  * See full set of options for RiMarkov (https://rednoise.org/rita/reference/RiTa/markov/index.html)