diff --git a/.librarian/state.yaml b/.librarian/state.yaml
index e56b8cfbfa51..29f2a42d5bba 100644
--- a/.librarian/state.yaml
+++ b/.librarian/state.yaml
@@ -726,7 +726,7 @@ libraries:
       - ^auditmanager/apiv1/auditmanagerpb/.*$
     tag_format: '{id}/v{version}'
   - id: auth
-    version: 0.18.2
+    version: 0.19.0
     last_generated_commit: 31b413bc4feb03f6849c718048c2b9998561b5fa
     apis: []
     source_roots:
diff --git a/auth/CHANGES.md b/auth/CHANGES.md
index 846231f64a81..38014c4fb26a 100644
--- a/auth/CHANGES.md
+++ b/auth/CHANGES.md
@@ -1,5 +1,11 @@
 # Changes
 
+## [0.19.0](https://github.com/googleapis/google-cloud-go/releases/tag/auth%2Fv0.19.0) (2026-03-23)
+
+### Features
+
+* add OpenTelemetry gRPC and HTTP wrappers for T4 tracing (#14133) ([d38abf9](https://github.com/googleapis/google-cloud-go/commit/d38abf988d4017b4832434abae9a90874bec5ce9))
+
 ## [0.18.2](https://github.com/googleapis/google-cloud-go/releases/tag/auth%2Fv0.18.2) (2026-02-13)
 
 ### Bug Fixes
diff --git a/auth/internal/version.go b/auth/internal/version.go
index b73008694f2f..fb1c45739cbb 100644
--- a/auth/internal/version.go
+++ b/auth/internal/version.go
@@ -17,4 +17,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "0.18.2"
+const Version = "0.19.0"