diff --git a/requirements.txt b/requirements.txt
index 499fc1c..464b096 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,4 +12,5 @@ requests==2.20.0
 setuptools==40.4.3
 setuptools_scm==3.1.0
 h5py==2.10.0
-tables==3.4.4
\ No newline at end of file
+tables==3.4.4
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file