diff --git a/README.md b/README.md
index 1204bd5..cfb9be3 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 nsscache - Asynchronously synchronise local NSS databases with remote directory services
 ========================================================================================
 
+<!-- Test validation -->
+
 ![ci](https://github.com/google/nsscache/workflows/CI/badge.svg)
 [![codecov](https://codecov.io/gh/google/nsscache/branch/master/graph/badge.svg)](https://codecov.io/gh/google/nsscache)
 
diff --git a/requirements.txt b/requirements.txt
index a6ace1f..cd0b6a7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 pytest
-boto3
+boto3==1.42.52
 google-cloud-storage
-pycurl==7.45.7
+pycurl==7.45.6
 python3-ldap
 python-ldap
 packaging