diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 56c2389..fa87c7e 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.50"
+  ".": "0.1.0-alpha.51"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b53788c..d6b3ed7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.1.0-alpha.51 (2026-02-07)
+
+Full Changelog: [v0.1.0-alpha.50...v0.1.0-alpha.51](https://github.com/OneBusAway/java-sdk/compare/v0.1.0-alpha.50...v0.1.0-alpha.51)
+
+### Chores
+
+* **internal:** upgrade AssertJ ([aae1bab](https://github.com/OneBusAway/java-sdk/commit/aae1bab6fcc34c5998e4c0a467de9dcb73026ff4))
+
 ## 0.1.0-alpha.50 (2026-01-31)
 
 Full Changelog: [v0.1.0-alpha.49...v0.1.0-alpha.50](https://github.com/OneBusAway/java-sdk/compare/v0.1.0-alpha.49...v0.1.0-alpha.50)
diff --git a/README.md b/README.md
index 1c5ad5d..5ddaf36 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@
 
 <!-- x-release-please-start-version -->
 
-[![Maven Central](https://img.shields.io/maven-central/v/org.onebusaway/onebusaway-sdk-java)](https://central.sonatype.com/artifact/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.50)
-[![javadoc](https://javadoc.io/badge2/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.50/javadoc.svg)](https://javadoc.io/doc/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.50)
+[![Maven Central](https://img.shields.io/maven-central/v/org.onebusaway/onebusaway-sdk-java)](https://central.sonatype.com/artifact/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.51)
+[![javadoc](https://javadoc.io/badge2/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.51/javadoc.svg)](https://javadoc.io/doc/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.51)
 
 <!-- x-release-please-end -->
 
@@ -15,7 +15,7 @@ It is generated with [Stainless](https://www.stainless.com/).
 
 <!-- x-release-please-start-version -->
 
-The REST API documentation can be found on [developer.onebusaway.org](https://developer.onebusaway.org). Javadocs are available on [javadoc.io](https://javadoc.io/doc/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.50).
+The REST API documentation can be found on [developer.onebusaway.org](https://developer.onebusaway.org). Javadocs are available on [javadoc.io](https://javadoc.io/doc/org.onebusaway/onebusaway-sdk-java/0.1.0-alpha.51).
 
 <!-- x-release-please-end -->
 
@@ -26,7 +26,7 @@ The REST API documentation can be found on [developer.onebusaway.org](https://de
 ### Gradle
 
 ```kotlin
-implementation("org.onebusaway:onebusaway-sdk-java:0.1.0-alpha.50")
+implementation("org.onebusaway:onebusaway-sdk-java:0.1.0-alpha.51")
 ```
 
 ### Maven
@@ -35,7 +35,7 @@ implementation("org.onebusaway:onebusaway-sdk-java:0.1.0-alpha.50")
 <dependency>
   <groupId>org.onebusaway</groupId>
   <artifactId>onebusaway-sdk-java</artifactId>
-  <version>0.1.0-alpha.50</version>
+  <version>0.1.0-alpha.51</version>
 </dependency>
 ```
 
diff --git a/build.gradle.kts b/build.gradle.kts
index eeb014b..99db1eb 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -8,7 +8,7 @@ repositories {
 
 allprojects {
     group = "org.onebusaway"
-    version = "0.1.0-alpha.50" // x-release-please-version
+    version = "0.1.0-alpha.51" // x-release-please-version
 }
 
 subprojects {
diff --git a/onebusaway-sdk-java-client-okhttp/build.gradle.kts b/onebusaway-sdk-java-client-okhttp/build.gradle.kts
index ecc7ea4..f77000f 100644
--- a/onebusaway-sdk-java-client-okhttp/build.gradle.kts
+++ b/onebusaway-sdk-java-client-okhttp/build.gradle.kts
@@ -10,6 +10,6 @@ dependencies {
     implementation("com.squareup.okhttp3:logging-interceptor:4.12.0")
 
     testImplementation(kotlin("test"))
-    testImplementation("org.assertj:assertj-core:3.25.3")
+    testImplementation("org.assertj:assertj-core:3.27.7")
     testImplementation("com.github.tomakehurst:wiremock-jre8:2.35.2")
 }
diff --git a/onebusaway-sdk-java-core/build.gradle.kts b/onebusaway-sdk-java-core/build.gradle.kts
index d069744..4609a93 100644
--- a/onebusaway-sdk-java-core/build.gradle.kts
+++ b/onebusaway-sdk-java-core/build.gradle.kts
@@ -33,7 +33,7 @@ dependencies {
     testImplementation(kotlin("test"))
     testImplementation(project(":onebusaway-sdk-java-client-okhttp"))
     testImplementation("com.github.tomakehurst:wiremock-jre8:2.35.2")
-    testImplementation("org.assertj:assertj-core:3.25.3")
+    testImplementation("org.assertj:assertj-core:3.27.7")
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.9.3")
     testImplementation("org.junit.jupiter:junit-jupiter-params:5.9.3")
     testImplementation("org.junit-pioneer:junit-pioneer:1.9.1")
diff --git a/onebusaway-sdk-java-proguard-test/build.gradle.kts b/onebusaway-sdk-java-proguard-test/build.gradle.kts
index f49a190..cc047fc 100644
--- a/onebusaway-sdk-java-proguard-test/build.gradle.kts
+++ b/onebusaway-sdk-java-proguard-test/build.gradle.kts
@@ -18,7 +18,7 @@ dependencies {
     testImplementation(project(":onebusaway-sdk-java"))
     testImplementation(kotlin("test"))
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.9.3")
-    testImplementation("org.assertj:assertj-core:3.25.3")
+    testImplementation("org.assertj:assertj-core:3.27.7")
     testImplementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.14.0")
 }