diff --git a/Dockerfile b/Dockerfile
index 03eb1552..312f7e78 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ ENV GOOGLEAPIS_HASH e47fdd266542386e5e7346697f90476e96dc7ee8
 ENV GAPIC_GENERATOR_HASH c895a56928c4b8b786a738db27aa93d925788e69
 # Define version number below. The ARTMAN_VERSION line is parsed by
 # .circleci/config.yml and setup.py, please keep the format.
-ENV ARTMAN_VERSION 1.1.1
+ENV ARTMAN_VERSION 1.2.0
 
 ENV DEBIAN_FRONTEND noninteractive