diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 5815c6a1fca1..ae720d7f7c6d 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -575,7 +575,7 @@
   "google-cloud-network_connectivity-v1alpha1+FILLER": "0.0.0",
   "google-cloud-network_management": "2.2.0",
   "google-cloud-network_management+FILLER": "0.0.0",
-  "google-cloud-network_management-v1": "2.8.0",
+  "google-cloud-network_management-v1": "2.9.0",
   "google-cloud-network_management-v1+FILLER": "0.0.0",
   "google-cloud-network_security": "1.3.0",
   "google-cloud-network_security+FILLER": "0.0.0",
diff --git a/google-cloud-network_management-v1/CHANGELOG.md b/google-cloud-network_management-v1/CHANGELOG.md
index dab745b3f79a..88199e8855e4 100644
--- a/google-cloud-network_management-v1/CHANGELOG.md
+++ b/google-cloud-network_management-v1/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+### 2.9.0 (2026-03-19)
+
+#### Features
+
+* Upgrade dependencies for Ruby v4.0 and drop Ruby v3.1 support
+
 ### 2.8.0 (2026-03-05)
 
 #### Features
diff --git a/google-cloud-network_management-v1/lib/google/cloud/network_management/v1/version.rb b/google-cloud-network_management-v1/lib/google/cloud/network_management/v1/version.rb
index 8c4c3ec60190..f07dac5d2151 100644
--- a/google-cloud-network_management-v1/lib/google/cloud/network_management/v1/version.rb
+++ b/google-cloud-network_management-v1/lib/google/cloud/network_management/v1/version.rb
@@ -21,7 +21,7 @@ module Google
   module Cloud
     module NetworkManagement
       module V1
-        VERSION = "2.8.0"
+        VERSION = "2.9.0"
       end
     end
   end
diff --git a/google-cloud-network_management-v1/snippets/snippet_metadata_google.cloud.networkmanagement.v1.json b/google-cloud-network_management-v1/snippets/snippet_metadata_google.cloud.networkmanagement.v1.json
index 3da6f5933c64..900059d06b3f 100644
--- a/google-cloud-network_management-v1/snippets/snippet_metadata_google.cloud.networkmanagement.v1.json
+++ b/google-cloud-network_management-v1/snippets/snippet_metadata_google.cloud.networkmanagement.v1.json
@@ -1,7 +1,7 @@
 {
   "client_library": {
     "name": "google-cloud-network_management-v1",
-    "version": "2.8.0",
+    "version": "2.9.0",
     "language": "RUBY",
     "apis": [
       {