diff --git a/src/main/java/dev/cerbos/sdk/builders/AttributeValue.java b/src/main/java/dev/cerbos/sdk/builders/AttributeValue.java
index 8ba48eb..c2aac0a 100644
--- a/src/main/java/dev/cerbos/sdk/builders/AttributeValue.java
+++ b/src/main/java/dev/cerbos/sdk/builders/AttributeValue.java
@@ -51,6 +51,10 @@ public static AttributeValue mapValue(Map<String, AttributeValue> values) {
         return new AttributeValue(Values.of(builder.build()));
     }
 
+    public static AttributeValue nullValue() {
+        return new AttributeValue(Values.ofNull());
+    }
+
     public Value toValue() {
         return value;
     }
diff --git a/src/test/java/dev/cerbos/sdk/CerbosClientTests.java b/src/test/java/dev/cerbos/sdk/CerbosClientTests.java
index df9c93c..fe06e6c 100644
--- a/src/test/java/dev/cerbos/sdk/CerbosClientTests.java
+++ b/src/test/java/dev/cerbos/sdk/CerbosClientTests.java
@@ -26,6 +26,7 @@
 import java.util.Optional;
 import java.util.stream.Collectors;
 
+import static dev.cerbos.sdk.builders.AttributeValue.nullValue;
 import static dev.cerbos.sdk.builders.AttributeValue.stringValue;
 
 abstract class CerbosClientTests {
@@ -40,7 +41,8 @@ public void checkWithoutJWT() {
                         .withPolicyVersion("20210210")
                         .withAttribute("team", stringValue("design"))
                         .withAttribute("department", stringValue("marketing"))
-                        .withAttribute("geography", stringValue("GB")),
+                        .withAttribute("geography", stringValue("GB"))
+                        .withAttribute("country", nullValue()),
                 Resource.newInstance("leave_request", "xx125")
                         .withPolicyVersion("20210210")
                         .withAttribute("id", stringValue("xx125"))