diff --git a/poetimizely-core/gradle/libs.versions.toml b/poetimizely-core/gradle/libs.versions.toml
index c82dd19..4a34564 100644
--- a/poetimizely-core/gradle/libs.versions.toml
+++ b/poetimizely-core/gradle/libs.versions.toml
@@ -12,7 +12,7 @@ nexus-publish = { id = "io.github.gradle-nexus.publish-plugin", version = "1.3.0
 spotless = { id = "com.diffplug.spotless", version = "6.24.0" }
 
 [libraries]
-optimizely-core-api = "com.optimizely.ab:core-api:3.10.4"
+optimizely-core-api = "com.optimizely.ab:core-api:4.0.0"
 kotest-runner-junit5 = { module = "io.kotest:kotest-runner-junit5-jvm", version.ref = "kotest" }
 kotest-assertions-core-jvm = { module = "io.kotest:kotest-assertions-core-jvm", version.ref = "kotest" }
 kotlin-compile-testing = "com.github.tschuchortdev:kotlin-compile-testing:1.5.0"
diff --git a/samples/gradle-plugin/build.gradle.kts b/samples/gradle-plugin/build.gradle.kts
index 583024a..3a942db 100644
--- a/samples/gradle-plugin/build.gradle.kts
+++ b/samples/gradle-plugin/build.gradle.kts
@@ -15,7 +15,7 @@ application {
 }
 
 dependencies {
-    implementation("com.optimizely.ab:core-api:3.10.4")
+    implementation("com.optimizely.ab:core-api:4.0.0")
     implementation("com.optimizely.ab:core-httpclient-impl:4.0.0")
     implementation(kotlin("stdlib"))
 }
diff --git a/samples/maven-plugin/pom.xml b/samples/maven-plugin/pom.xml
index 32443a6..b56b78a 100644
--- a/samples/maven-plugin/pom.xml
+++ b/samples/maven-plugin/pom.xml
@@ -15,7 +15,7 @@
         <dependency>
             <groupId>com.optimizely.ab</groupId>
             <artifactId>core-api</artifactId>
-            <version>3.10.4</version>
+            <version>4.0.0</version>
         </dependency>
         <dependency>
             <groupId>com.optimizely.ab</groupId>