diff --git a/generation_config.yaml b/generation_config.yaml
index 0b90bed6932d..8756b691b955 100644
--- a/generation_config.yaml
+++ b/generation_config.yaml
@@ -1,4 +1,4 @@
-gapic_generator_version: 2.68.0
+gapic_generator_version: 2.67.0
 googleapis_commitish: 456866bff20ee005cbc248b3478c577d28304e60
 libraries_bom_version: 26.79.0
 libraries:
diff --git a/java-dataplex/grpc-google-cloud-dataplex-v1/src/main/java/com/google/cloud/dataplex/v1/ContentServiceGrpc.java b/java-dataplex/grpc-google-cloud-dataplex-v1/src/main/java/com/google/cloud/dataplex/v1/ContentServiceGrpc.java
index 7d657f076cf9..a087ae2f0103 100644
--- a/java-dataplex/grpc-google-cloud-dataplex-v1/src/main/java/com/google/cloud/dataplex/v1/ContentServiceGrpc.java
+++ b/java-dataplex/grpc-google-cloud-dataplex-v1/src/main/java/com/google/cloud/dataplex/v1/ContentServiceGrpc.java
@@ -15,6 +15,7 @@
  */
 package com.google.cloud.dataplex.v1;
 
+
 /**
  *
  *
diff --git a/java-spanner/README.md b/java-spanner/README.md
index acf710386a2e..03914f98ef10 100644
--- a/java-spanner/README.md
+++ b/java-spanner/README.md
@@ -381,6 +381,7 @@ Samples are in the [`samples/`](https://github.com/googleapis/google-cloud-java/
 | List Databases Sample | [source code](https://github.com/googleapis/google-cloud-java/blob/main/samples/snippets/src/main/java/com/example/spanner/ListDatabasesSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-java&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/ListDatabasesSample.java) |
 | List Instance Config Operations Sample | [source code](https://github.com/googleapis/google-cloud-java/blob/main/samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigOperationsSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-java&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigOperationsSample.java) |
 | List Instance Configs Sample | [source code](https://github.com/googleapis/google-cloud-java/blob/main/samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigsSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-java&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/ListInstanceConfigsSample.java) |
+| Mutable Credentials Example | [source code](https://github.com/googleapis/google-cloud-java/blob/main/samples/snippets/src/main/java/com/example/spanner/MutableCredentialsExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-java&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/MutableCredentialsExample.java) |
 | Pg Alter Sequence Sample | [source code](https://github.com/googleapis/google-cloud-java/blob/main/samples/snippets/src/main/java/com/example/spanner/PgAlterSequenceSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-java&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/PgAlterSequenceSample.java) |
 | Pg Async Query To List Async Example | [source code](https://github.com/googleapis/google-cloud-java/blob/main/samples/snippets/src/main/java/com/example/spanner/PgAsyncQueryToListAsyncExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-java&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/PgAsyncQueryToListAsyncExample.java) |
 | Pg Async Runner Example | [source code](https://github.com/googleapis/google-cloud-java/blob/main/samples/snippets/src/main/java/com/example/spanner/PgAsyncRunnerExample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-java&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/spanner/PgAsyncRunnerExample.java) |