diff --git a/.librarian/state.yaml b/.librarian/state.yaml
index f42c51007c..14b01c2641 100644
--- a/.librarian/state.yaml
+++ b/.librarian/state.yaml
@@ -1,7 +1,7 @@
 image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/librarian-go@sha256:f2cbb6b904fdbf086efec0100536c52a79a654a5b9df21f975a2b6f6d50395a4
 libraries:
   - id: generator
-    version: 0.55.0
+    version: 0.55.1
     last_generated_commit: ""
     apis: []
     source_roots:
diff --git a/CHANGES.md b/CHANGES.md
index b425483dde..bf89b5fa02 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,11 @@
 # Changes
 
+## [0.55.1](https://github.com/googleapis/google-cloud-go/releases/tag/v0.55.1) (2025-11-13)
+
+### Bug Fixes
+
+* revert ordered dynamic header values (#1661)" ([9d27531](https://github.com/googleapis/google-cloud-go/commit/9d2753140c56a152484436a3717d9345ef546551))
+
 ## [0.55.0](https://github.com/googleapis/google-cloud-go/releases/tag/v0.55.0) (2025-11-12)
 
 ### Features
diff --git a/internal/version.go b/internal/version.go
index a2e6c92039..ad23e34a93 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -17,4 +17,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "0.55.0"
+const Version = "0.55.1"