diff --git a/.github/actions/test-khiops-install/action.yml b/.github/actions/test-khiops-install/action.yml
index a44d7c275..4d6c131f1 100644
--- a/.github/actions/test-khiops-install/action.yml
+++ b/.github/actions/test-khiops-install/action.yml
@@ -61,11 +61,11 @@ runs:
         touch test/LearningTest/TestCoclustering/Standard/Iris/results/time.log
         touch test/LearningTest/TestKhiops/Standard/Iris/results/time.log
         echo "Check test results"
-        cd test/LearningTest/cmd/python/
-        $PYTHON test_khiops.py Khiops nul Standard
-        $PYTHON test_khiops.py Coclustering nul Standard
-        $PYTHON apply_command.py errors ../../TestKhiops/Standard/ Iris | tee /tmp/khiops-log.txt
-        $PYTHON apply_command.py errors ../../TestCoclustering/Standard/ Iris | tee /tmp/coclustering-log.txt
+        cd test/LearningTestTool/py/
+        $PYTHON kht_test.py ../../LearningTest/TestKhiops/Standard/Iris check
+        $PYTHON kht_test.py ../../LearningTest/TestCoclustering/Standard/Iris check
+        $PYTHON kht_apply.py ../../LearningTest/TestKhiops/Standard/Iris errors | tee /tmp/khiops-log.txt
+        $PYTHON kht_apply.py ../../LearningTest/TestCoclustering/Standard/Iris errors | tee /tmp/khiops-log.txt
         if (grep -q error /tmp/khiops-log.txt || grep -q error /tmp/coclustering-log.txt); then
           echo "::error::Errors in Khiops run"
           false
diff --git a/test/LearningTestTool/py/kht_apply.py b/test/LearningTestTool/py/kht_apply.py
index e0ecc947e..dc2c3e420 100644
--- a/test/LearningTestTool/py/kht_apply.py
+++ b/test/LearningTestTool/py/kht_apply.py
@@ -137,7 +137,9 @@ def register_all_instructions():
 
     instructions1 = standard_instructions.register_standard_instructions()
     instructions2 = one_shot_instructions.register_one_shot_instructions()
-    all_instructions = instructions1 | instructions2
+    # L'operateur d'union entre dictionnaires '|' n'est supporte que depuis python 3.9
+    all_instructions = instructions1
+    all_instructions.update(instructions2)
     return all_instructions, len(instructions1)