diff --git a/.github/workflows/conformance.yml b/.github/workflows/conformance.yml
index adfcbdd..bf5c278 100644
--- a/.github/workflows/conformance.yml
+++ b/.github/workflows/conformance.yml
@@ -1,11 +1,9 @@
 name: PHP Conformance CI
 on:
-  pull_request:
-    branches:
-      - master
   push:
     branches:
-      - master
+      - main
+  pull_request:
   workflow_dispatch:
 jobs:
   build:
@@ -81,4 +79,4 @@ jobs:
         functionType: 'cloudevent'
         useBuildpacks: false
         validateMapping: true
-        cmd: "'php -S localhost:8080 router.php'"
\ No newline at end of file
+        cmd: "'php -S localhost:8080 router.php'"
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index 4973c9a..9efdb37 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -2,7 +2,7 @@ name: PHP Lint CI
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 jobs:
   php-cs-fixer:
diff --git a/.github/workflows/unit.yaml b/.github/workflows/unit.yaml
index 56ba817..2b99351 100644
--- a/.github/workflows/unit.yaml
+++ b/.github/workflows/unit.yaml
@@ -2,7 +2,7 @@ name: PHP Unit CI
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
 jobs:
   build:
diff --git a/README.md b/README.md
index 6f097b4..7836273 100644
--- a/README.md
+++ b/README.md
@@ -196,7 +196,7 @@ gcloud run deploy my-cloud-function \
 After your instance deploys, you can access it at the URL provided, or view it
 in the [Cloud Console][cloud-run-console].
 
-[functions-samples]: https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/functions
+[functions-samples]: https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/functions
 [functions-how-to]: https://cloud.google.com/functions/docs/how-to
 [gcloud]: https://cloud.google.com/sdk/gcloud/
 [gcloud-auth]: https://cloud.google.com/sdk/docs/authorizing
diff --git a/src/LegacyEventMapper.php b/src/LegacyEventMapper.php
index 3dc225d..77f57a2 100644
--- a/src/LegacyEventMapper.php
+++ b/src/LegacyEventMapper.php
@@ -23,7 +23,7 @@ class LegacyEventMapper
 {
     // Maps background/legacy event types to their equivalent CloudEvent types.
     // For more info on event mappings see
-    // https://github.com/GoogleCloudPlatform/functions-framework-conformance/blob/master/docs/mapping.md
+    // https://github.com/GoogleCloudPlatform/functions-framework-conformance/blob/main/docs/mapping.md
     private static $ceTypeMap = [
         'google.pubsub.topic.publish' => 'google.cloud.pubsub.topic.v1.messagePublished',
         'providers/cloud.pubsub/eventTypes/topic.publish' => 'google.cloud.pubsub.topic.v1.messagePublished',