diff --git a/ocr-service/main.py b/ocr-service/main.py
index 955f7fbd..8e4d2288 100644
--- a/ocr-service/main.py
+++ b/ocr-service/main.py
@@ -366,7 +366,8 @@ async def train_model(
             os.makedirs(checkpoint_dir, exist_ok=True)
 
             cmd = [
-                "ketos", "train",
+                "ketos", "--workers", "0",
+                "train",
                 "-f", "path",
                 "-o", checkpoint_dir,
                 "-q", "fixed",
@@ -456,7 +457,8 @@ async def segtrain_model(
             os.makedirs(checkpoint_dir, exist_ok=True)
 
             cmd = [
-                "ketos", "segtrain",
+                "ketos", "--workers", "0",
+                "segtrain",
                 "-o", checkpoint_dir,
                 "-q", "fixed",
                 "-N", "50",