diff --git a/.stats.yml b/.stats.yml
index 3466561..f5fe242 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 21
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/prompt-foundry%2Fprompt-foundry-sdk-4f2f102207a7920168c5275abfbec4b156a1f8cef6bee009d4b1dd21a3878eb8.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/prompt-foundry%2Fprompt-foundry-sdk-21244ccc5783139d80c623dfbcbe5f67c48291edd544e919bccb0fbb64780d90.yml
diff --git a/src/resources/evaluation-assertions.ts b/src/resources/evaluation-assertions.ts
index d5cdfb2..b78bed9 100644
--- a/src/resources/evaluation-assertions.ts
+++ b/src/resources/evaluation-assertions.ts
@@ -71,7 +71,7 @@ export interface EvaluationAssertion {
    */
   jsonPath: string | null;
 
-  targetValue: string;
+  targetValue: string | null;
 
   /**
    * The name of the tool to match. Only required when type is `TOOL_CALLED` or
@@ -106,7 +106,7 @@ export interface EvaluationAssertionCreateParams {
    */
   jsonPath: string | null;
 
-  targetValue: string;
+  targetValue: string | null;
 
   /**
    * The name of the tool to match. Only required when type is `TOOL_CALLED` or
@@ -135,7 +135,7 @@ export interface EvaluationAssertionUpdateParams {
    */
   jsonPath: string | null;
 
-  targetValue: string;
+  targetValue: string | null;
 
   /**
    * The name of the tool to match. Only required when type is `TOOL_CALLED` or