diff --git a/Dockerfile b/Dockerfile
index 6ba0e342..a5f668ec 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ ENV GOOGLEAPIS_HASH ab437f2bb2100360f8d119530b0a020228baa4cc
 ENV GAPIC_GENERATOR_HASH 4524f2d025adee7998bc6dd193f4edffaa969b1c
 # Define version number below. The ARTMAN_VERSION line is parsed by
 # .circleci/config.yml and setup.py, please keep the format.
-ENV ARTMAN_VERSION 0.25.0
+ENV ARTMAN_VERSION 0.26.0
 
 ENV DEBIAN_FRONTEND noninteractive