diff --git a/antarest/study/business/optimization_management.py b/antarest/study/business/optimization_management.py
index cb599d12e2..a33236997b 100644
--- a/antarest/study/business/optimization_management.py
+++ b/antarest/study/business/optimization_management.py
@@ -132,7 +132,7 @@ def get_field_values(self, study: Study) -> OptimizationFormFields:
         def get_value(field_info: FieldInfo) -> Any:
             path = field_info["path"]
             study_ver = file_study.config.version
-            start_ver = cast(int, field_info.get("start_version", -1))
+            start_ver = cast(int, field_info.get("start_version", 0))
             target_name = path.split("/")[-1]
             is_in_version = start_ver <= study_ver
 
diff --git a/requirements.txt b/requirements.txt
index 228814e8c5..2a7ff60a2d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Antares-Launcher~=1.3.2
-antares-study-version~=1.0.6
+antares-study-version==1.0.6
 antares-timeseries-generation~=0.1.5
 
 # When you install `fastapi[all]`, you get FastAPI along with additional dependencies:
diff --git a/tests/storage/business/test_study_version_upgrader.py b/tests/storage/business/test_study_version_upgrader.py
index 4fa7e940ec..39ce1da653 100644
--- a/tests/storage/business/test_study_version_upgrader.py
+++ b/tests/storage/business/test_study_version_upgrader.py
@@ -188,7 +188,7 @@ def assert_settings_are_updated(tmp_path: Path, old_values: List[str]) -> None:
     assert adequacy_patch["threshold-initiate-curtailment-sharing-rule"] == 0.0
     assert adequacy_patch["threshold-display-local-matching-rule-violations"] == 0.0
     assert adequacy_patch["threshold-csr-variable-bounds-relaxation"] == 3
-    assert adequacy_patch["enable-first-step"]
+    assert not adequacy_patch["enable-first-step"]
 
 
 def get_old_settings_values(tmp_path: Path) -> List[str]: