SEBA-394 fix unit test susceptible to side-effects

Change-Id: I277b96fb76ac4a406ce6a7aff5ae1a6c2550c0bf
diff --git a/containers/chameleon/Dockerfile.chameleon b/containers/chameleon/Dockerfile.chameleon
index b9aa657..05afd4b 100644
--- a/containers/chameleon/Dockerfile.chameleon
+++ b/containers/chameleon/Dockerfile.chameleon
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # xosproject/chameleon
-FROM xosproject/xos-base:2.1.28
+FROM xosproject/xos-base:2.1.29
 
 # xos-base already has protoc and dependencies installed