diff --git a/.circleci/config.yml b/.circleci/config.yml
index 337d2cc..8a0abb7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,9 +1,9 @@
-version: 2.0
+version: 2.1
 jobs:
   build:
     resource_class: riskified/container-agent
     docker:
-      - image: 284309667046.dkr.ecr.us-east-1.amazonaws.com/riskified/images-library/openjdk-cimg:master-8.0
+      - image: 284309667046.dkr.ecr.us-east-1.amazonaws.com/riskified/images-library/openjdk-cimg:master-21.0
 
     working_directory: ~/repo
     steps:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5e678e6..552299b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -31,11 +31,11 @@ jobs:
         env:
           GPG_SIGNING_KEY: ${{ secrets.SECRING_GPG_ASC_BASE64 }}
 
-      - name: Set up JDK 8
-        uses: actions/setup-java@v4 ##this action sets up a java environment that our job can run in
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5 ##this action sets up a java environment that our job can run in
         with:
           distribution: 'zulu'
-          java-version: 8
+          java-version: 21
           overwrite-settings: false
 
       - name: Build project with Maven
diff --git a/README.md b/README.md
index c9a1e85..cc50f8c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 Riskified JAVA SDK
 =================
 
-version: 3.3.0
+version: 4.0.0
 ------------------
 
 See http://apiref.riskified.com for full API documentation
@@ -104,7 +104,7 @@ curl -H "Content-Type: application/json" -H  "X-RISKIFIED-HMAC-SHA256: 071ef80d5
 <dependency>
     <groupId>com.riskified</groupId>
     <artifactId>riskified-sdk</artifactId>
-    <version>v3.3.0</version>
+    <version>v4.0.0</version>
 </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index 75c3171..e6c7384 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,10 +8,10 @@
         <plugins>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.1</version>
+                <version>3.14.1</version>
                 <configuration>
-                    <source/>
-                    <target/>
+                    <source>1.8</source>
+                    <target>1.8</target>
                 </configuration>
             </plugin>
         </plugins>
diff --git a/riskified-sample/pom.xml b/riskified-sample/pom.xml
index 480f99b..53f82e8 100644
--- a/riskified-sample/pom.xml
+++ b/riskified-sample/pom.xml
@@ -9,7 +9,7 @@
         <dependency>
             <groupId>com.riskified</groupId>
             <artifactId>riskified-sdk</artifactId>
-            <version>v2.2.2</version>
+            <version>v4.0.0</version>
         </dependency>
 
         <dependency>
diff --git a/riskified-sdk/pom.xml b/riskified-sdk/pom.xml
index d3ab00e..af6f896 100644
--- a/riskified-sdk/pom.xml
+++ b/riskified-sdk/pom.xml
@@ -29,10 +29,10 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.2</version>
+                <version>3.14.1</version>
                 <configuration>
-                    <source>1.5</source>
-                    <target>1.5</target>
+                    <source>1.8</source>
+                    <target>1.8</target>
                 </configuration>
             </plugin>
 
@@ -68,7 +68,10 @@
              <plugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-javadoc-plugin</artifactId>
-                 <version>2.9</version>
+                 <version>3.6.3</version>
+                 <configuration>
+                     <source>1.8</source>
+                 </configuration>
                  <executions>
                      <execution>
                          <id>attach-javadocs</id>