Update CERNenv Space

space/training/requirements.txt

@@ -7,7 +7,12 @@ torch==2.6.0
 torchvision==0.21.0
 torchaudio==2.6.0
 unsloth==2026.4.8
+# Pin transformers to 4.x: the 5.x series dropped many legacy model classes
+# (e.g. BloomPreTrainedModel) that current peft / trl still reference, which
+# broke imports at runtime.
+transformers>=4.51.3,<5.0
 trl>=0.18.2,<=0.24.0,!=0.19.0
+peft>=0.18.0,<0.20
 xformers
 matplotlib>=3.8.0
 numpy>=1.24.0