diff --git a/packages/@aws-cdk/aws-lambda-python-alpha/test/lambda-handler-custom-build/requirements.txt b/packages/@aws-cdk/aws-lambda-python-alpha/test/lambda-handler-custom-build/requirements.txt
index 877c89e099f9f..b1fe59f163280 100644
--- a/packages/@aws-cdk/aws-lambda-python-alpha/test/lambda-handler-custom-build/requirements.txt
+++ b/packages/@aws-cdk/aws-lambda-python-alpha/test/lambda-handler-custom-build/requirements.txt
@@ -1,7 +1,7 @@
 # Lock versions of pip packages
 certifi==2023.7.22
 chardet==3.0.4
-idna==2.10
+idna==3.7
 urllib3==1.26.18
 # Requests used by this lambda
 requests==2.31.0