diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e8a12ce6b..058a11210 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -213,6 +213,8 @@ When submitting provider changes:
 
 Use Node.js `>=24.22.1` (Node 26 recommended/default) and Bun `1.4.4` (tracked in `.bun-version`).
 
+Keep `@types/node` on the Node 24 major to match the minimum supported runtime, even when developing on Node 26. Pin it to an exact published 24.x version; the type package version does not need to match the Node.js runtime patch version.
+
 Install dependencies:
 
 ```bash
diff --git a/bun.lock b/bun.lock
index dcf315f88..e79904137 100644
--- a/bun.lock
+++ b/bun.lock
@@ -27,7 +27,7 @@
         "@smithy/core": "3.36.2",
         "@smithy/node-http-handler": "4.12.1",
         "@types/bun": "1.4.4",
-        "@types/node": "^24.19.2",
+        "@types/node": "24.19.2",
         "@types/react": "19.2.14",
         "@typescript-eslint/eslint-plugin": "8.72.0",
         "@typescript-eslint/parser": "8.72.0",
diff --git a/package.json b/package.json
index 24160ea39..342d23d82 100644
--- a/package.json
+++ b/package.json
@@ -107,7 +107,7 @@
     "@smithy/core": "3.36.2",
     "@smithy/node-http-handler": "4.12.1",
     "@types/bun": "1.4.4",
-    "@types/node": "^24.19.2",
+    "@types/node": "24.19.2",
     "@types/react": "19.2.14",
     "@typescript-eslint/eslint-plugin": "8.72.0",
     "@typescript-eslint/parser": "8.72.0",