diff --git a/backend/requirements/build.txt b/backend/requirements/build.txt
index 5e10849..3f26ca2 100644
--- a/backend/requirements/build.txt
+++ b/backend/requirements/build.txt
@@ -1,5 +1,5 @@
-pypdf
-nltk
-sentence_transformers
-llama-index
-grobid_tei_xml
+pypdf==3.16.0
+grobid-tei-xml==0.1.3
+nltk==3.8.1
+sentence-transformers==2.2.2
+llama-index==0.8.24.post1