diff --git a/requirements.txt b/requirements.txt
index 9a3fce0..09dad0b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,6 @@ pandas
 xlrd
 matplotlib
 codeclimate-test-reporter
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+pillow>=10.3.0 # not directly required, pinned by Snyk to avoid a vulnerability