diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index f5baa882d..542bbbea2 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-    ".": "1.55.2"
+    ".": "1.56.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6fc4e1d91..8fab2464c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [1.56.0](https://github.com/googleapis/api-linter/compare/v1.55.2...v1.56.0) (2023-08-11)
+
+
+### Features
+
+* **AIP-121:** enforce list requirement ([#1225](https://github.com/googleapis/api-linter/issues/1225)) ([7ad11d0](https://github.com/googleapis/api-linter/commit/7ad11d0add4228236bae63f8b3e87812428758e8))
+* **AIP-156:** allow singleton list ([#1230](https://github.com/googleapis/api-linter/issues/1230)) ([ccb38cf](https://github.com/googleapis/api-linter/commit/ccb38cfed985c24dad9055704103583a2d8ff326))
+
 ## [1.55.2](https://github.com/googleapis/api-linter/compare/v1.55.1...v1.55.2) (2023-08-02)
 
 
diff --git a/internal/version.go b/internal/version.go
index f568c2680..6f3ca2614 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -14,4 +14,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "1.55.2"
+const Version = "1.56.0"