diff --git a/ippisite/requirements-core.txt b/ippisite/requirements-core.txt
index 30c14ec1b061f01004a339857638671e50029d13..584aac22008865d9c5899c5865f31a901642e1e6 100644
--- a/ippisite/requirements-core.txt
+++ b/ippisite/requirements-core.txt
@@ -17,7 +17,8 @@ xlwt
 bioservices
 bioblend
 bs4
-chembl_webresource_client
+requests-cache==0.5.2
+chembl_webresource_client==0.10.2
 # libraries to compute PCA
 scikit-learn==0.23.2
 scipy==1.5.2
diff --git a/ippisite/requirements-dev.txt b/ippisite/requirements-dev.txt
index 1549db98da83318c76e564367834cb831570a3f1..033973ba86df36b1a6e9896fa5a4e749c5de7e82 100644
--- a/ippisite/requirements-dev.txt
+++ b/ippisite/requirements-dev.txt
@@ -10,7 +10,6 @@ sphinxcontrib-bibtex==2.1.4
 # coverage
 coverage
 # tests
-requests-cache
 parameterized
 # dependencies to generate graph models using django-extensions
 pygraphviz