diff --git a/src/Microsoft.OpenApi.OData.Reader/Microsoft.OpenAPI.OData.Reader.csproj b/src/Microsoft.OpenApi.OData.Reader/Microsoft.OpenAPI.OData.Reader.csproj
index a430ab9e5..445c13d0c 100644
--- a/src/Microsoft.OpenApi.OData.Reader/Microsoft.OpenAPI.OData.Reader.csproj
+++ b/src/Microsoft.OpenApi.OData.Reader/Microsoft.OpenAPI.OData.Reader.csproj
@@ -30,7 +30,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.OData.Edm" Version="8.4.3" />
-    <PackageReference Include="Microsoft.OpenApi" Version="3.3.1" />
+    <PackageReference Include="Microsoft.OpenApi" Version="3.4.0" />
     <None Include="..\..\README.md" Pack="true" PackagePath="\" />
     <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.14.15">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.json b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.json
index 0c4cf15a0..d5e7cd421 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.json
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.json
@@ -1023,6 +1023,9 @@
         "@odata.id": {
           "type": "string"
         }
+      },
+      "additionalProperties": {
+        "type": "object"
       }
     },
     "ReferenceNumeric": {
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.yaml b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.yaml
index 04c5823fa..c4bf24aac 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.yaml
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.yaml
@@ -674,6 +674,8 @@ definitions:
     properties:
       '@odata.id':
         type: string
+    additionalProperties:
+      type: object
   ReferenceNumeric:
     type: string
     enum:
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.json b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.json
index 903543187..a00913d7f 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.json
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.json
@@ -96,6 +96,9 @@
         "@odata.id": {
           "type": "string"
         }
+      },
+      "additionalProperties": {
+        "type": "object"
       }
     },
     "ReferenceNumeric": {
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.yaml b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.yaml
index b64887995..6b6a987a8 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.yaml
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.yaml
@@ -67,6 +67,8 @@ definitions:
     properties:
       '@odata.id':
         type: string
+    additionalProperties:
+      type: object
   ReferenceNumeric:
     type: string
     enum:
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.json b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.json
index 3872430cc..33379332e 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.json
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.json
@@ -4480,6 +4480,9 @@
         "@odata.id": {
           "type": "string"
         }
+      },
+      "additionalProperties": {
+        "type": "object"
       }
     },
     "ReferenceNumeric": {
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.yaml b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.yaml
index f7bd67c68..981a2e20d 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.yaml
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Multiple.Schema.OpenApi.V2.yaml
@@ -3163,6 +3163,8 @@ definitions:
     properties:
       '@odata.id':
         type: string
+    additionalProperties:
+      type: object
   ReferenceNumeric:
     type: string
     enum:
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.json b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.json
index 91b3fef34..ee7efe4c3 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.json
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.json
@@ -31981,6 +31981,9 @@
         "@odata.id": {
           "type": "string"
         }
+      },
+      "additionalProperties": {
+        "type": "object"
       }
     },
     "ReferenceNumeric": {
diff --git a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.yaml b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.yaml
index 4cbb31377..72516a2aa 100644
--- a/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.yaml
+++ b/test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/TripService.OpenApi.V2.yaml
@@ -21697,6 +21697,8 @@ definitions:
     properties:
       '@odata.id':
         type: string
+    additionalProperties:
+      type: object
   ReferenceNumeric:
     type: string
     enum: