diff --git a/.github/workflows/update_generation_config.yaml b/.github/workflows/update_generation_config.yaml
index 59e39834d..a7e14bb48 100644
--- a/.github/workflows/update_generation_config.yaml
+++ b/.github/workflows/update_generation_config.yaml
@@ -26,7 +26,7 @@ jobs:
       # the branch into which the pull request is merged
       base_branch: main
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
         token: ${{ secrets.CLOUD_JAVA_BOT_TOKEN }}
diff --git a/README.md b/README.md
index cde790fe0..33e35185e 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ If you are using Maven without the BOM, add this to your dependencies:
 If you are using Gradle 5.x or later, add this to your dependencies:
 
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:26.65.0')
+implementation platform('com.google.cloud:libraries-bom:26.66.0')
 
 implementation 'com.google.cloud:google-cloud-pubsub'
 ```
diff --git a/generation_config.yaml b/generation_config.yaml
index 1656f749d..c649bc0e2 100644
--- a/generation_config.yaml
+++ b/generation_config.yaml
@@ -1,6 +1,6 @@
 gapic_generator_version: 2.61.0
-googleapis_commitish: f4902d9b4168b4d1b162f5c5bcf149086579fa26
-libraries_bom_version: 26.65.0
+googleapis_commitish: d869249c5d3da60af39dc7968140468ef7d1fdd6
+libraries_bom_version: 26.66.0
 libraries:
   - api_shortname: pubsub
     name_pretty: Cloud Pub/Sub