diff --git a/.changeset/green-cheetahs-scream.md b/.changeset/green-cheetahs-scream.md
new file mode 100644
index 0000000000..1836f4a44a
--- /dev/null
+++ b/.changeset/green-cheetahs-scream.md
@@ -0,0 +1,5 @@
+---
+"@trigger.dev/core": patch
+---
+
+Add --experimental-global-webcrypto node option fix "crypto is not defined error" on Node.js 18 in dev
diff --git a/packages/core/src/v3/build/runtime.ts b/packages/core/src/v3/build/runtime.ts
index d473f0f7f8..5b667f6e12 100644
--- a/packages/core/src/v3/build/runtime.ts
+++ b/packages/core/src/v3/build/runtime.ts
@@ -48,7 +48,12 @@ export function execOptionsForRuntime(runtime: BuildRuntime, options: ExecOption
 
       const conditions = options.customConditions?.map((condition) => `--conditions=${condition}`);
 
-      return [importEntryPoint, conditions, process.env.NODE_OPTIONS]
+      return [
+        importEntryPoint,
+        conditions,
+        process.env.NODE_OPTIONS,
+        nodeRuntimeNeedsGlobalWebCryptoFlag() ? "--experimental-global-webcrypto" : undefined,
+      ]
         .filter(Boolean)
         .flat()
         .join(" ");
@@ -58,3 +63,12 @@ export function execOptionsForRuntime(runtime: BuildRuntime, options: ExecOption
     }
   }
 }
+
+// Detect if we are using node v18, since we don't support lower than 18, and we only need to enable the flag for v18
+function nodeRuntimeNeedsGlobalWebCryptoFlag(): boolean {
+  try {
+    return process.versions.node.startsWith("18.");
+  } catch {
+    return false;
+  }
+}