AETHER-869 Upgrade base OS version

Change-Id: I620752299c105970e8aa43cfb0d68e92f8a61d98
diff --git a/Makefile b/Makefile
index 3d7f3bf..cdb2052 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@
 ENB_NAME                 ?= lte-softmodem
 
 # Tag is fixed to OAI release version, v1.0.0, regardless of VERSION file
-DOCKER_TAG               ?= 1.0.0
+DOCKER_TAG               ?= 1.1.0
 DOCKER_REGISTRY          ?=
 DOCKER_REPOSITORY        ?=
 DOCKER_BUILD_ARGS        ?=