diff --git a/Dockerfile b/Dockerfile
index f161763..2857584 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # gcr.io/distroless/python3-debian11 (runtime env is using 3.9 and that's imporatant for native dependencies)
-FROM python:3.9-slim AS builder
+FROM python:3.13-slim AS builder
 
 WORKDIR /
 
diff --git a/Dockerfile-azure-pipelines b/Dockerfile-azure-pipelines
index 86cc461..0afbf54 100644
--- a/Dockerfile-azure-pipelines
+++ b/Dockerfile-azure-pipelines
@@ -1,5 +1,5 @@
 # gcr.io/distroless/python3-debian11 (runtime env is using 3.9 and that's imporatant for native dependencies)
-FROM python:3.9-slim AS builder
+FROM python:3.13-slim AS builder
 
 WORKDIR /
 
@@ -20,7 +20,7 @@ RUN pip3 install --target=/app -r requirements.txt --no-deps
 COPY cognite/transformations_cli/ /app/cognite/transformations_cli/
 
 # Distroless does not work with Azure pipelines
-FROM python:3.9-bullseye
+FROM python:3.13-bullseye
 COPY --from=builder /app /app
 ENV PYTHONPATH /app