diff --git a/CHANGELOG.md b/CHANGELOG.md
index 58cafe9..0869480 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 The Reasoner Validator package is evolving along with progress in TRAPI and Biolink Model standards within the NCATS Biomedical Knowledge Translator. 
 
+## v3.5.10
+- Extend TRAPI Response sanitization (following Eric Deutsch guidance)
+
 ## v3.5.9
 - Fixed bug in attribute_type_id detection of attribute_type_id namespaces
 
diff --git a/pyproject.toml b/pyproject.toml
index 173cf3c..bfe6e8f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "reasoner-validator"
-version = "3.5.9"
+version = "3.5.10"
 description = "Validation tools for Reasoner API"
 authors = [
     "Richard Bruskiewich <richard.bruskiewich@delphinai.com>",
diff --git a/reasoner_validator/__init__.py b/reasoner_validator/__init__.py
index dc0f592..e2f23f6 100644
--- a/reasoner_validator/__init__.py
+++ b/reasoner_validator/__init__.py
@@ -31,6 +31,7 @@ class TRAPIResponseValidator(ValidationReporter):
 
     TRAPI_1_3_0 = SemVer.from_string("1.3.0")
     TRAPI_1_4_0 = SemVer.from_string("1.4.0")
+    TRAPI_1_4_0_BETA3 = SemVer.from_string("1.4.0-beta3")
     TRAPI_1_4_0_BETA4 = SemVer.from_string("1.4.0-beta4")
 
     def __init__(
@@ -90,8 +91,10 @@ def sanitize_trapi_response(self, response: Dict) -> Dict:
                     if 'upstream_resource_ids' not in source or source['upstream_resource_ids'] is None:
                         source['upstream_resource_ids'] = []
 
-        # 'auxiliary_graphs' ought to be nullable, however... not specified that way (yet)
-        if 'auxiliary_graphs' not in response['message'] or response['message']['auxiliary_graphs'] is None:
+        # 'auxiliary_graphs' (from TRAPI 1.4.0-beta2 onwards)
+        # ought to be nullable, however... not specified that way (yet)
+        if current_version >= self.TRAPI_1_4_0_BETA3 and \
+                ('auxiliary_graphs' not in response['message'] or response['message']['auxiliary_graphs'] is None):
             response['message']['auxiliary_graphs'] = []
 
         if 'workflow' in response and response['workflow']: