diff --git a/.azure-pipelines/jobs/test-docker.yml b/.azure-pipelines/jobs/test-docker.yml
index 41dc2daec..defb8d3ae 100644
--- a/.azure-pipelines/jobs/test-docker.yml
+++ b/.azure-pipelines/jobs/test-docker.yml
@@ -1,6 +1,6 @@
 parameters:
   docker: ''  # defaults for any parameters that aren't specified
-  dockerTag: 'master'
+  dockerTag: '6.2.x'
   name: ''
   vmImage: 'Ubuntu-16.04'
 
diff --git a/.travis.yml b/.travis.yml
index 3ce2ffcd4..b69e646fe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,18 +36,18 @@ matrix:
     - python: '3.5'
       name: "3.5 Xenial PYTHONOPTIMIZE=2"
       env: PYTHONOPTIMIZE=2
-    - env: DOCKER="alpine" DOCKER_TAG="master"
-    - env: DOCKER="arch" DOCKER_TAG="master" # contains PyQt5
-    - env: DOCKER="ubuntu-16.04-xenial-amd64" DOCKER_TAG="master"
-    - env: DOCKER="ubuntu-18.04-bionic-amd64" DOCKER_TAG="master"
-    - env: DOCKER="debian-9-stretch-x86" DOCKER_TAG="master"
-    - env: DOCKER="debian-10-buster-x86" DOCKER_TAG="master"
-    - env: DOCKER="centos-6-amd64" DOCKER_TAG="master"
-    - env: DOCKER="centos-7-amd64" DOCKER_TAG="master"
-    - env: DOCKER="amazon-1-amd64" DOCKER_TAG="master"
-    - env: DOCKER="amazon-2-amd64" DOCKER_TAG="master"
-    - env: DOCKER="fedora-29-amd64" DOCKER_TAG="master"
-    - env: DOCKER="fedora-30-amd64" DOCKER_TAG="master"
+    - env: DOCKER="alpine" DOCKER_TAG="6.2.x"
+    - env: DOCKER="arch" DOCKER_TAG="6.2.x" # contains PyQt5
+    - env: DOCKER="ubuntu-16.04-xenial-amd64" DOCKER_TAG="6.2.x"
+    - env: DOCKER="ubuntu-18.04-bionic-amd64" DOCKER_TAG="6.2.x"
+    - env: DOCKER="debian-9-stretch-x86" DOCKER_TAG="6.2.x"
+    - env: DOCKER="debian-10-buster-x86" DOCKER_TAG="6.2.x"
+    - env: DOCKER="centos-6-amd64" DOCKER_TAG="6.2.x"
+    - env: DOCKER="centos-7-amd64" DOCKER_TAG="6.2.x"
+    - env: DOCKER="amazon-1-amd64" DOCKER_TAG="6.2.x"
+    - env: DOCKER="amazon-2-amd64" DOCKER_TAG="6.2.x"
+    - env: DOCKER="fedora-29-amd64" DOCKER_TAG="6.2.x"
+    - env: DOCKER="fedora-30-amd64" DOCKER_TAG="6.2.x"
 
 services:
   - docker