diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8c5ae0..f21b2fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [3.5.1](https://github.com/OctopusDeploy/api-client.ts/compare/v3.5.0...v3.5.1) (2024-12-18)
+
+
+### Bug Fixes
+
+* Make runbookretention unit optional ([a90cecf](https://github.com/OctopusDeploy/api-client.ts/commit/a90cecfb1ca9961f6dc7be977287d6a7c213ad0d))
+
 ## [3.5.0](https://github.com/OctopusDeploy/api-client.ts/compare/v3.4.1...v3.5.0) (2024-12-17)
 
 
diff --git a/package-lock.json b/package-lock.json
index 31b2002..1218b3a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@octopusdeploy/api-client",
-  "version": "3.5.0",
+  "version": "3.5.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@octopusdeploy/api-client",
-      "version": "3.5.0",
+      "version": "3.5.1",
       "license": "Apache-2.0",
       "dependencies": {
         "adm-zip": "^0.5.9",
diff --git a/package.json b/package.json
index c4785dc..22593aa 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "test": "jest --maxWorkers=4 --config=jest.config.js --ci --reporters=default --reporters=jest-junit"
   },
   "types": "dist/index.d.ts",
-  "version": "3.5.0",
+  "version": "3.5.1",
   "jest-junit": {
     "outputDirectory": "reports",
     "outputName": "jest-junit.xml",