diff --git a/backend/ecmk_fetcher/handler/Dockerfile b/backend/ecmk_fetcher/handler/Dockerfile
index aebcd7aa..d0ad2e64 100644
--- a/backend/ecmk_fetcher/handler/Dockerfile
+++ b/backend/ecmk_fetcher/handler/Dockerfile
@@ -1,4 +1,7 @@
-FROM mcr.microsoft.com/playwright/python:v1.58.0-jammy
+# jammy (Ubuntu 22.04) ships Python 3.10, which lacks enum.StrEnum — used by
+# domain/modelling/measure_type.py, pulled in transitively via the copied
+# domain/ package. noble (Ubuntu 24.04) ships Python 3.12.
+FROM mcr.microsoft.com/playwright/python:v1.58.0-noble
 
 # Install AWS Lambda RIE
 ADD https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie /usr/local/bin/aws-lambda-rie
diff --git a/backend/pashub_fetcher/handler/Dockerfile b/backend/pashub_fetcher/handler/Dockerfile
index 575b8565..d20d00d0 100644
--- a/backend/pashub_fetcher/handler/Dockerfile
+++ b/backend/pashub_fetcher/handler/Dockerfile
@@ -1,4 +1,8 @@
-FROM mcr.microsoft.com/playwright/python:v1.58.0-jammy
+# jammy (Ubuntu 22.04) ships Python 3.10, which lacks enum.StrEnum — used by
+# domain/modelling/measure_type.py, which the handler pulls in transitively
+# (handler -> pashub_service -> documents_parser.parser -> ... -> domain).
+# noble (Ubuntu 24.04) ships Python 3.12, matching the project's 3.11+ standard.
+FROM mcr.microsoft.com/playwright/python:v1.58.0-noble
 
 # Install AWS Lambda RIE
 ADD https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie /usr/local/bin/aws-lambda-rie