diff --git a/transformers/examples/research_projects/pplm/requirements.txt b/transformers/examples/research_projects/pplm/requirements.txt
index 62092cc30..a21895fbb 100644
--- a/transformers/examples/research_projects/pplm/requirements.txt
+++ b/transformers/examples/research_projects/pplm/requirements.txt
@@ -19,4 +19,4 @@ pytest
 conllu
 sentencepiece != 0.1.92
 protobuf
-transformers==3.5.1
+transformers==4.30.0