diff --git a/requirements.txt b/requirements.txt
index d9a9f9b367626d649705948fe7798647355ba9a9..f8ef70907656ba0ae315013137d19d927409d892 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,5 +11,5 @@ pyyaml>=3.12
 plotly>=4.2.1
 matplotlib>=3.1.1
 tabulate>=0.8.6
-pyscm @ git+https://github.com/aldro61/pyscm#egg=pyscm
+pyscm>=1.0.0 @ git+https://github.com/aldro61/pyscm#egg=pyscm