diff --git a/packages/aws-cdk/lib/cli/util/npm.ts b/packages/aws-cdk/lib/cli/util/npm.ts
index 6f9477726..3b036c688 100644
--- a/packages/aws-cdk/lib/cli/util/npm.ts
+++ b/packages/aws-cdk/lib/cli/util/npm.ts
@@ -20,7 +20,7 @@ export async function execNpmView(currentVersion: string) {
       throw new ToolkitError('NpmViewCurrentFailed', `npm view command for current version failed: ${currentResult.stderr.trim()}`);
     }
 
-    const latestVersion = latestResult.stdout;
+    const latestVersion = latestResult.stdout.trim();
     const currentInfo = JSON.parse(currentResult.stdout);
 
     return {