diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 9ce8396fe0..cd8bc8740c 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -5,5 +5,5 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 docker:
-  image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:82d046d572a11b84d64d4b9af93ad55a1b6a4854917504ba7557acdfce907dde
+  image: gcr.io/repo-automation-bots/owlbot-python:latest
+  digest: sha256:0ffe3bdd6c7159692df5f7744da74e5ef19966288a6bf76023e8e04e0c424d7d
diff --git a/.github/workflows/django_tests_against_emulator0.yml b/.github/workflows/django_tests_against_emulator0.yml
index 0f7f7c99db..2b31049e72 100644
--- a/.github/workflows/django_tests_against_emulator0.yml
+++ b/.github/workflows/django_tests_against_emulator0.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests0
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator1.yml b/.github/workflows/django_tests_against_emulator1.yml
index 921a9a5848..722a593af1 100644
--- a/.github/workflows/django_tests_against_emulator1.yml
+++ b/.github/workflows/django_tests_against_emulator1.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests1
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator2.yml b/.github/workflows/django_tests_against_emulator2.yml
index 682de38ed6..364803ab3a 100644
--- a/.github/workflows/django_tests_against_emulator2.yml
+++ b/.github/workflows/django_tests_against_emulator2.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests2
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator3.yml b/.github/workflows/django_tests_against_emulator3.yml
index ea83185a82..9e2df8ae94 100644
--- a/.github/workflows/django_tests_against_emulator3.yml
+++ b/.github/workflows/django_tests_against_emulator3.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests3
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator4.yml b/.github/workflows/django_tests_against_emulator4.yml
index 6a59ff7725..361dccfbc7 100644
--- a/.github/workflows/django_tests_against_emulator4.yml
+++ b/.github/workflows/django_tests_against_emulator4.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests4
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator5.yml b/.github/workflows/django_tests_against_emulator5.yml
index f07609fb2f..817b0c4295 100644
--- a/.github/workflows/django_tests_against_emulator5.yml
+++ b/.github/workflows/django_tests_against_emulator5.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests5
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator6.yml b/.github/workflows/django_tests_against_emulator6.yml
index 3984852de2..ab9d817c98 100644
--- a/.github/workflows/django_tests_against_emulator6.yml
+++ b/.github/workflows/django_tests_against_emulator6.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests6
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator7.yml b/.github/workflows/django_tests_against_emulator7.yml
index 0932197f86..4ee19f9373 100644
--- a/.github/workflows/django_tests_against_emulator7.yml
+++ b/.github/workflows/django_tests_against_emulator7.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests7
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator8.yml b/.github/workflows/django_tests_against_emulator8.yml
index 98d4b5f1d8..5c148ddd23 100644
--- a/.github/workflows/django_tests_against_emulator8.yml
+++ b/.github/workflows/django_tests_against_emulator8.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests8
 jobs:
diff --git a/.github/workflows/django_tests_against_emulator9.yml b/.github/workflows/django_tests_against_emulator9.yml
index 0ba4baefce..4388c3cfa6 100644
--- a/.github/workflows/django_tests_against_emulator9.yml
+++ b/.github/workflows/django_tests_against_emulator9.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: django-tests9
 jobs:
diff --git a/.github/workflows/integration-tests-against-emulator.yml b/.github/workflows/integration-tests-against-emulator.yml
index efd2c4e5bb..5767e966bb 100644
--- a/.github/workflows/integration-tests-against-emulator.yml
+++ b/.github/workflows/integration-tests-against-emulator.yml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: Run Django Spanner integration tests against emulator
 jobs:
diff --git a/.kokoro/test-samples-impl.sh b/.kokoro/test-samples-impl.sh
index ac70148661..595dca8b0d 100755
--- a/.kokoro/test-samples-impl.sh
+++ b/.kokoro/test-samples-impl.sh
@@ -72,7 +72,7 @@ for file in samples/**/requirements.txt; do
     EXIT=$?
 
     # If this is a periodic build, send the test log to the FlakyBot.
-    # See https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot.
+    # See https://github.com/googleapis/repo-automation-bots/tree/main/packages/flakybot.
     if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"periodic"* ]]; then
       chmod +x $KOKORO_GFILE_DIR/linux_amd64/flakybot
       $KOKORO_GFILE_DIR/linux_amd64/flakybot
diff --git a/README.rst b/README.rst
index 637ffe6c7e..62739a3182 100644
--- a/README.rst
+++ b/README.rst
@@ -220,13 +220,13 @@ How it works
 Overall design
 ~~~~~~~~~~~~~~
 
-.. figure:: https://raw.githubusercontent.com/googleapis/python-spanner-django/master/assets/overview.png
+.. figure:: https://raw.githubusercontent.com/googleapis/python-spanner-django/main/assets/overview.png
    :alt: "Overall Design"
 
 Internals
 ~~~~~~~~~
 
-.. figure:: https://raw.githubusercontent.com/googleapis/python-spanner-django/master/assets/internals.png
+.. figure:: https://raw.githubusercontent.com/googleapis/python-spanner-django/main/assets/internals.png
    :alt: "Internals"
 
 
@@ -247,11 +247,11 @@ HOW TO CONTRIBUTE
 
 Contributions to this library are always welcome and highly encouraged.
 
-See `CONTRIBUTING <https://github.com/googleapis/python-spanner-django/blob/master/CONTRIBUTING.md>`_ for more information on how to get started.
+See `CONTRIBUTING <https://github.com/googleapis/python-spanner-django/blob/main/CONTRIBUTING.md>`_ for more information on how to get started.
 
 Please note that this project is released with a Contributor Code of Conduct.
 By participating in this project you agree to abide by its terms. See the `Code 
-of Conduct <https://github.com/googleapis/python-spanner-django/blob/master/CODE_OF_CONDUCT.md>`_ for more information.
+of Conduct <https://github.com/googleapis/python-spanner-django/blob/main/CODE_OF_CONDUCT.md>`_ for more information.
 
 Current limitations
 -------------------