diff --git a/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy b/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy
index 19ecad1a5afc..e23976c64a62 100644
--- a/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy
+++ b/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy
@@ -622,7 +622,11 @@ class BeamModulePlugin implements Plugin<Project> {
     // [bomupgrader] determined by: com.google.api:gax, consistent with: google_cloud_platform_libraries_bom
     def gax_version = "2.84.0"
     def google_ads_version = "33.0.0"
-    def google_clients_version = "2.0.0"
+    // [bomupgrader] determined by: com.google.api-client:google-api-client, consistent with: google_cloud_platform_libraries_bom
+    def google_api_client_version = "2.7.2"
+    // Suffix of the generated com.google.apis:google-api-services-* artifact versions
+    // (e.g. v1b3-rev20260503-2.0.0). This is NOT the google-api-client version.
+    def google_api_services_version_suffix = "2.0.0"
     def google_cloud_bigdataoss_version = "3.1.16"
     def google_code_gson_version = "2.10.1"
     def google_oauth_clients_version = "1.34.1"
@@ -749,15 +753,17 @@ class BeamModulePlugin implements Plugin<Project> {
         gax_grpc                                    : "com.google.api:gax-grpc", // google_cloud_platform_libraries_bom sets version
         gax_grpc_test                               : "com.google.api:gax-grpc:$gax_version:testlib", // google_cloud_platform_libraries_bom sets version
         gax_httpjson                                : "com.google.api:gax-httpjson", // google_cloud_platform_libraries_bom sets version
-        google_api_client                           : "com.google.api-client:google-api-client:$google_clients_version", // for the libraries using $google_clients_version below.
-        google_api_client_gson                      : "com.google.api-client:google-api-client-gson:$google_clients_version",
-        google_api_client_java6                     : "com.google.api-client:google-api-client-java6:$google_clients_version",
+        google_api_client                           : "com.google.api-client:google-api-client:$google_api_client_version",
+        google_api_client_gson                      : "com.google.api-client:google-api-client-gson:$google_api_client_version",
+        google_api_client_java6                     : "com.google.api-client:google-api-client-java6:$google_api_client_version",
         google_api_common                           : "com.google.api:api-common", // google_cloud_platform_libraries_bom sets version
         google_api_services_bigquery                : "com.google.apis:google-api-services-bigquery:v2-rev20260731-2.0.0",  // [bomupgrader] sets version
         google_api_services_cloudresourcemanager    : "com.google.apis:google-api-services-cloudresourcemanager:v1-rev20250606-2.0.0",  // [bomupgrader] sets version
-        google_api_services_dataflow                : "com.google.apis:google-api-services-dataflow:v1b3-rev20260503-$google_clients_version",
-        google_api_services_healthcare              : "com.google.apis:google-api-services-healthcare:v1-rev20240130-$google_clients_version",
-        google_api_services_pubsub                  : "com.google.apis:google-api-services-pubsub:v1-rev20220904-$google_clients_version",
+        // libraries-bom does not pin the following THREE google-api-services-* artifacts (no library
+        // in the BOM depends on them), so bomupgrader cannot upgrade them. Upgrade them manually.
+        google_api_services_dataflow                : "com.google.apis:google-api-services-dataflow:v1b3-rev20260503-$google_api_services_version_suffix",
+        google_api_services_healthcare              : "com.google.apis:google-api-services-healthcare:v1-rev20240130-$google_api_services_version_suffix",
+        google_api_services_pubsub                  : "com.google.apis:google-api-services-pubsub:v1-rev20220904-$google_api_services_version_suffix",
         google_api_services_storage                 : "com.google.apis:google-api-services-storage:v1-rev20260524-2.0.0",  // [bomupgrader] sets version
         google_auth_library_credentials             : "com.google.auth:google-auth-library-credentials", // google_cloud_platform_libraries_bom sets version
         google_auth_library_oauth2_http             : "com.google.auth:google-auth-library-oauth2-http", // google_cloud_platform_libraries_bom sets version
diff --git a/runners/google-cloud-dataflow-java/worker/build.gradle b/runners/google-cloud-dataflow-java/worker/build.gradle
index a343cac28177..232fb683866b 100644
--- a/runners/google-cloud-dataflow-java/worker/build.gradle
+++ b/runners/google-cloud-dataflow-java/worker/build.gradle
@@ -20,7 +20,7 @@ plugins { id 'org.apache.beam.module' }
 
 // Set a specific version of 'com.google.apis:google-api-services-dataflow'
 // by adding -Pdataflow.version=<version> in Gradle command. Otherwise,
-// 'google_clients_version' defined in BeamModulePlugin will be used as default.
+// 'library.java.google_api_services_dataflow' defined in BeamModulePlugin will be used as default.
 def DATAFLOW_VERSION = "dataflow.version"
 
 // Get full dependency of 'com.google.apis:google-api-services-dataflow'
diff --git a/scripts/tools/bomupgrader.py b/scripts/tools/bomupgrader.py
index 715c19a899d1..b0ad507dc4db 100644
--- a/scripts/tools/bomupgrader.py
+++ b/scripts/tools/bomupgrader.py
@@ -103,6 +103,7 @@ class BeamModulePluginProcessor:
   KNOWN_DEPS = {
       "arrow": "org.apache.arrow:arrow-memory-core",
       "gax": "com.google.api:gax",
+      "google_api_client": "com.google.api-client:google-api-client",
       "grpc":
           "io.grpc:grpc-netty",  # use "grpc-netty" to pick up proper netty version
       "netty": "io.netty:netty-transport",