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-rw-r--r--tests/Dockerfile-dind-certs4
1 files changed, 3 insertions, 1 deletions
diff --git a/tests/Dockerfile-dind-certs b/tests/Dockerfile-dind-certs
index 9e8c042..2ab87ef 100644
--- a/tests/Dockerfile-dind-certs
+++ b/tests/Dockerfile-dind-certs
@@ -1,4 +1,6 @@
-FROM python:2.7
+ARG PYTHON_VERSION=2.7
+
+FROM python:${PYTHON_VERSION}
RUN mkdir /tmp/certs
VOLUME /certs