diff --git a/package.json b/package.json
index c07508189..b436304e4 100644
--- a/package.json
+++ b/package.json
@@ -38,11 +38,10 @@
     "@rnx-kit/tools-git": "^0.1.1",
     "@swc-node/register": "^1.11.1",
     "@swc/core": "^1.15.8",
-    "@types/js-yaml": "^4.0.5",
     "@types/node": "catalog:",
     "eslint-plugin-wdio": "^9.26.0",
     "globals": "^16.5.0",
-    "js-yaml": "^4.1.0",
+    "js-yaml": "^5.0.0",
     "knip": "^6.23.0",
     "minimatch": "^10.0.0",
     "nx": "^22.0.0",
diff --git a/scripts/affected.ts b/scripts/affected.ts
index 330b1d23c..2450a4566 100644
--- a/scripts/affected.ts
+++ b/scripts/affected.ts
@@ -1,5 +1,5 @@
 import { getBaseCommit, getChangedFiles, git } from "@rnx-kit/tools-git";
-import yaml from "js-yaml";
+import * as yaml from "js-yaml";
 import { Minimatch } from "minimatch";
 import * as fs from "node:fs";
 
diff --git a/scripts/copy-yarnrc.js b/scripts/copy-yarnrc.js
index 53f28df86..1c00270aa 100644
--- a/scripts/copy-yarnrc.js
+++ b/scripts/copy-yarnrc.js
@@ -1,8 +1,10 @@
 // @ts-check
-import yaml from "js-yaml";
+import * as yaml from "js-yaml";
 import * as fs from "node:fs";
 import * as path from "node:path";
 
+/** @import { JSONObject } from "../packages/app/scripts/types.ts" */
+
 /**
  * Copies specified `.yarnrc.yaml`.
  * @param {string} src
@@ -16,9 +18,7 @@ function main(src, dst) {
   });
 
   const yml = fs.readFileSync(src, { encoding: "utf-8" });
-  const rc = /** @type {Record<string, string | string[] | undefined>} */ (
-    yaml.load(yml)
-  );
+  const rc = /** @type {JSONObject} */ (yaml.load(yml));
 
   rc["nodeLinker"] = "node-modules";
   rc["plugins"] = [];
diff --git a/yarn.lock b/yarn.lock
index 2dc40adf4..f895ef458 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2503,11 +2503,10 @@ __metadata:
     "@rnx-kit/tools-git": "npm:^0.1.1"
     "@swc-node/register": "npm:^1.11.1"
     "@swc/core": "npm:^1.15.8"
-    "@types/js-yaml": "npm:^4.0.5"
     "@types/node": "catalog:"
     eslint-plugin-wdio: "npm:^9.26.0"
     globals: "npm:^16.5.0"
-    js-yaml: "npm:^4.1.0"
+    js-yaml: "npm:^5.0.0"
     knip: "npm:^6.23.0"
     minimatch: "npm:^10.0.0"
     nx: "npm:^22.0.0"
@@ -5144,13 +5143,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/js-yaml@npm:^4.0.5":
-  version: 4.0.9
-  resolution: "@types/js-yaml@npm:4.0.9"
-  checksum: 10c0/24de857aa8d61526bbfbbaa383aa538283ad17363fcd5bb5148e2c7f604547db36646440e739d78241ed008702a8920665d1add5618687b6743858fae00da211
-  languageName: node
-  linkType: hard
-
 "@types/mustache@npm:^4.0.0":
   version: 4.2.6
   resolution: "@types/mustache@npm:4.2.6"
@@ -10382,6 +10374,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"js-yaml@npm:^5.0.0":
+  version: 5.2.1
+  resolution: "js-yaml@npm:5.2.1"
+  dependencies:
+    argparse: "npm:^2.0.1"
+  bin:
+    js-yaml: bin/js-yaml.mjs
+  checksum: 10c0/8eadf08efc738a656c2838f6617b0cc508944f66f568eb4d435e858261b889a6806d98f44fb6ffdba21a0c68e4bdff1ac35516724882e1dab8fc2cc59150c881
+  languageName: node
+  linkType: hard
+
 "js2xmlparser2@npm:^0.x":
   version: 0.2.0
   resolution: "js2xmlparser2@npm:0.2.0"