diff --git a/.release-please-individual-manifest.json b/.release-please-individual-manifest.json
index 8f7a7b154539..791c0f2957df 100644
--- a/.release-please-individual-manifest.json
+++ b/.release-please-individual-manifest.json
@@ -9,5 +9,5 @@
   "pubsublite": "1.10.0",
   "spanner": "1.93.0",
   "storage": "1.64.0",
-  "vertexai": "0.19.0"
+  "vertexai": "0.20.0"
 }
diff --git a/librarian.yaml b/librarian.yaml
index 6099d700fcc7..1b159d6146c9 100644
--- a/librarian.yaml
+++ b/librarian.yaml
@@ -1416,7 +1416,7 @@ libraries:
       - path: google/cloud/vectorsearch/v1
       - path: google/cloud/vectorsearch/v1beta
   - name: vertexai
-    version: 0.19.0
+    version: 0.20.0
     keep:
       - README.md
       - internal/version.go
diff --git a/vertexai/CHANGES.md b/vertexai/CHANGES.md
index b633fb432510..ac03922af760 100644
--- a/vertexai/CHANGES.md
+++ b/vertexai/CHANGES.md
@@ -1,5 +1,15 @@
 # Changes
 
+## [0.20.0](https://github.com/googleapis/google-cloud-go/compare/vertexai/v0.19.0...vertexai/v0.20.0) (2026-07-22)
+
+
+### Features
+
+* Add Agent Engine-level configuration for generation_trigger_config. ([427745c](https://github.com/googleapis/google-cloud-go/commit/427745cc2a481dfa5a96399ceb553f6f8cf80fe0))
+* Add ingest_events method for Memory Bank. ([427745c](https://github.com/googleapis/google-cloud-go/commit/427745cc2a481dfa5a96399ceb553f6f8cf80fe0))
+* **o11y:** Regenerate clients for LRO tracing ([#20107](https://github.com/googleapis/google-cloud-go/issues/20107)) ([779074e](https://github.com/googleapis/google-cloud-go/commit/779074edd267a26520bae459307660953129eb07))
+* **vertexai:** Add subset_topics to Memory Bank GenerateMemories ([45d75e5](https://github.com/googleapis/google-cloud-go/commit/45d75e5d0693fbd1a7fba6472be00e4120e388ed))
+
 ## [0.19.0](https://github.com/googleapis/google-cloud-go/releases/tag/vertexai%2Fv0.19.0) (2026-04-09)
 
 ## [0.18.0](https://github.com/googleapis/google-cloud-go/releases/tag/vertexai%2Fv0.18.0) (2026-04-02)
diff --git a/vertexai/internal/version.go b/vertexai/internal/version.go
index ca0eca45e1f2..d627069b570d 100644
--- a/vertexai/internal/version.go
+++ b/vertexai/internal/version.go
@@ -17,4 +17,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "0.19.0"
+const Version = "0.20.0"