diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 554e34bb..f81bf992 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.30.0"
+  ".": "0.31.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2255859e..6abe49ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,28 @@
 # Changelog
 
+## 0.31.0 (2024-03-21)
+
+Full Changelog: [v0.30.0...v0.31.0](https://github.com/lithic-com/lithic-java/compare/v0.30.0...v0.31.0)
+
+### Features
+
+* add HttpRequestBody.contentLength() ([#180](https://github.com/lithic-com/lithic-java/issues/180)) ([698e235](https://github.com/lithic-com/lithic-java/commit/698e23567ffc8ff173894e5626ab84b9580bcdf1))
+* **api:** adds closed state ([#187](https://github.com/lithic-com/lithic-java/issues/187)) ([232277a](https://github.com/lithic-com/lithic-java/commit/232277af6ef161f108daa48589823c34efbda6f9))
+* **api:** updates ([#186](https://github.com/lithic-com/lithic-java/issues/186)) ([2749351](https://github.com/lithic-com/lithic-java/commit/274935112e836c984352b470627c2359f43caccc))
+
+
+### Chores
+
+* add back removed code ([9965596](https://github.com/lithic-com/lithic-java/commit/99655967238020ff205d2812c48c93253b7f30f5))
+* **docs:** add back custom readme code ([9361669](https://github.com/lithic-com/lithic-java/commit/9361669cb3f182827eb14336698ceaa5e4a4a3be))
+* **docs:** temporarily remove custom readme code ([#183](https://github.com/lithic-com/lithic-java/issues/183)) ([ccda207](https://github.com/lithic-com/lithic-java/commit/ccda207ebcffb9344e427ae0e417b84c4489c4a3))
+* temporarily remove various code as part of refactor ([#184](https://github.com/lithic-com/lithic-java/issues/184)) ([2023541](https://github.com/lithic-com/lithic-java/commit/202354150ffb3786029e17d92069de9e2018be62))
+
+
+### Documentation
+
+* **readme:** consistent use of sentence case in headings ([#185](https://github.com/lithic-com/lithic-java/issues/185)) ([15801dc](https://github.com/lithic-com/lithic-java/commit/15801dcd42824d272576e3db006748091937e05f))
+
 ## 0.30.0 (2024-03-05)
 
 Full Changelog: [v0.29.0...v0.30.0](https://github.com/lithic-com/lithic-java/compare/v0.29.0...v0.30.0)
diff --git a/README.md b/README.md
index a70c8397..d9842891 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 <!-- x-release-please-start-version -->
 
-[![Maven Central](https://img.shields.io/maven-central/v/com.lithic.api/lithic-java)](https://central.sonatype.com/artifact/com.lithic.api/lithic-java/0.30.0)
+[![Maven Central](https://img.shields.io/maven-central/v/com.lithic.api/lithic-java)](https://central.sonatype.com/artifact/com.lithic.api/lithic-java/0.31.0)
 
 <!-- x-release-please-end -->
 
@@ -25,7 +25,7 @@ The REST API documentation can be found [on docs.lithic.com](https://docs.lithi
 <!-- x-release-please-start-version -->
 
 ```kotlin
-implementation("com.lithic.api:lithic-java:0.30.0")
+implementation("com.lithic.api:lithic-java:0.31.0")
 ```
 
 #### Maven
@@ -34,7 +34,7 @@ implementation("com.lithic.api:lithic-java:0.30.0")
 <dependency>
     <groupId>com.lithic.api</groupId>
     <artifactId>lithic-java</artifactId>
-    <version>0.30.0</version>
+    <version>0.31.0</version>
 </dependency>
 ```
 
diff --git a/build.gradle.kts b/build.gradle.kts
index 133f3caa..d657da85 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -4,7 +4,7 @@ plugins {
 
 allprojects {
     group = "com.lithic.api"
-    version = "0.30.0" // x-release-please-version
+    version = "0.31.0" // x-release-please-version
 }
 
 nexusPublishing {