diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 9b2b955..144aa60 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/repo-automation-bots/owlbot-nodejs:latest
-  digest: sha256:6245a5be4c0406d9b2f04f380d8b88ffe4655df3cdbb57626f8913e8d620f4dd
+  digest: sha256:72ff93409133b0cf277b8870f859e1ddde62d2e329f655311d4bfc16735d182e
diff --git a/.github/generated-files-bot.yml b/.github/generated-files-bot.yml
index 7bb7ce5..992ccef 100644
--- a/.github/generated-files-bot.yml
+++ b/.github/generated-files-bot.yml
@@ -8,9 +8,9 @@ generatedFiles:
 - path: '.github/generated-files-bot.+(yml|yaml)'
   message: '`.github/generated-files-bot.(yml|yaml)` should be updated in [`synthtool`](https://github.com/googleapis/synthtool)'
 - path: 'README.md'
-  message: '`README.md` is managed by [`synthtool`](https://github.com/googleapis/synthtool). However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/master/.readme-partials.yaml'
+  message: '`README.md` is managed by [`synthtool`](https://github.com/googleapis/synthtool). However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml'
 - path: 'samples/README.md'
-  message: '`samples/README.md` is managed by [`synthtool`](https://github.com/googleapis/synthtool). However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/master/.readme-partials.yaml'
+  message: '`samples/README.md` is managed by [`synthtool`](https://github.com/googleapis/synthtool). However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml'
 ignoreAuthors:
 - 'gcf-owl-bot[bot]'
 - 'yoshi-automation'
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f033c0d..36dbfb2 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 name: ci
 jobs:
diff --git a/.kokoro/continuous/node10/common.cfg b/.kokoro/continuous/node10/common.cfg
index f32b9ff..7452d7f 100644
--- a/.kokoro/continuous/node10/common.cfg
+++ b/.kokoro/continuous/node10/common.cfg
@@ -7,7 +7,7 @@ action {
   }
 }
 
-# Bring in codecov.io master token into the build as $KOKORO_KEYSTORE_DIR/73713_dpebot_codecov_token
+# Bring in codecov.io token into the build as $KOKORO_KEYSTORE_DIR/73713_dpebot_codecov_token
 before_action {
   fetch_keystore {
     keystore_resource {
diff --git a/.kokoro/continuous/node10/test.cfg b/.kokoro/continuous/node10/test.cfg
index 468b8c7..609c0cf 100644
--- a/.kokoro/continuous/node10/test.cfg
+++ b/.kokoro/continuous/node10/test.cfg
@@ -1,4 +1,4 @@
-# Bring in codecov.io master token into the build as $KOKORO_KEYSTORE_DIR/73713_dpebot_codecov_token
+# Bring in codecov.io token into the build as $KOKORO_KEYSTORE_DIR/73713_dpebot_codecov_token
 before_action {
   fetch_keystore {
     keystore_resource {
diff --git a/.kokoro/presubmit/node10/common.cfg b/.kokoro/presubmit/node10/common.cfg
index f32b9ff..7452d7f 100644
--- a/.kokoro/presubmit/node10/common.cfg
+++ b/.kokoro/presubmit/node10/common.cfg
@@ -7,7 +7,7 @@ action {
   }
 }
 
-# Bring in codecov.io master token into the build as $KOKORO_KEYSTORE_DIR/73713_dpebot_codecov_token
+# Bring in codecov.io token into the build as $KOKORO_KEYSTORE_DIR/73713_dpebot_codecov_token
 before_action {
   fetch_keystore {
     keystore_resource {
diff --git a/.kokoro/samples-test.sh b/.kokoro/samples-test.sh
index 950f848..f249d3e 100755
--- a/.kokoro/samples-test.sh
+++ b/.kokoro/samples-test.sh
@@ -39,7 +39,7 @@ if [ -f samples/package.json ]; then
     npm link ../
     npm install
     cd ..
-    # If tests are running against master, configure flakybot
+    # If tests are running against main branch, configure flakybot
     # to open issues on failures:
     if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"continuous"* ]] || [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"nightly"* ]]; then
       export MOCHA_REPORTER_OUTPUT=test_output_sponge_log.xml
diff --git a/.kokoro/system-test.sh b/.kokoro/system-test.sh
index 319d1e0..0a84045 100755
--- a/.kokoro/system-test.sh
+++ b/.kokoro/system-test.sh
@@ -33,7 +33,7 @@ fi
 
 npm install
 
-# If tests are running against master, configure flakybot
+# If tests are running against main branch, configure flakybot
 # to open issues on failures:
 if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"continuous"* ]] || [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"nightly"* ]]; then
   export MOCHA_REPORTER_OUTPUT=test_output_sponge_log.xml
diff --git a/.kokoro/test.sh b/.kokoro/test.sh
index b5646ae..af1ce7e 100755
--- a/.kokoro/test.sh
+++ b/.kokoro/test.sh
@@ -21,7 +21,7 @@ export NPM_CONFIG_PREFIX=${HOME}/.npm-global
 cd $(dirname $0)/..
 
 npm install
-# If tests are running against master, configure flakybot
+# If tests are running against main branch, configure flakybot
 # to open issues on failures:
 if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"continuous"* ]] || [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"nightly"* ]]; then
   export MOCHA_REPORTER_OUTPUT=test_output_sponge_log.xml