diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e834b3784..5e14adcf8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,6 +13,8 @@ jobs:
         include:
           - smalltalk: Pharo64-13
             experimental: true
+          - smalltalk: GToolkit64-release
+            experimental: true
           - smalltalk: Squeak64-6.0
             experimental: true
           - smalltalk: Squeak64-5.3
diff --git a/scripts/preTestingPharo.st b/scripts/preTestingPharo.st
index 0ea2d0728..048c1b624 100644
--- a/scripts/preTestingPharo.st
+++ b/scripts/preTestingPharo.st
@@ -1 +1,5 @@
-Deprecation activateTransformations: false.
\ No newline at end of file
+Deprecation activateTransformations: false.
+(Smalltalk hasClassNamed: 'GtImageSetup') ifTrue: [
+	{ Dictionary. OrderedDictionary. SequenceableCollection } do: [ :class |
+		(class includesSelector: #asJson) ifTrue: [
+			class removeSelector: #asJson ] ] ].