diff --git a/action.yml b/action.yml
index 66c8629..a13ece2 100644
--- a/action.yml
+++ b/action.yml
@@ -41,7 +41,7 @@ inputs:
     required: false
   FIRELY_TERMINAL_VERSION:
     description: 'Version of Firely Terminal used for .NET-based validation'
-    default: '3.3.2'
+    default: '3.3.0'
     required: true
   JAVA_VALIDATOR_VERSION:
     description: 'Version of org.hl7.fhir.core library used for Java-based validation'