diff --git a/tox.ini b/tox.ini
index 435ac629d..b4fe0690a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -596,6 +596,7 @@ deps =
   flaky==3.7.0
   remoulade>=0.50
   mysqlclient~=2.1.1
+  pyyaml==5.3.1
 
 changedir =
   tests/opentelemetry-docker-tests/tests