diff --git a/tox.ini b/tox.ini
index 61fafc5..f404643 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,6 +29,7 @@ commands =
     test: pip freeze
     test: pytest --pyargs glue_plotly --cov glue_plotly {posargs}
 deps =
+    devdeps: git+https://github.com/glue-viz/echo
     devdeps: git+https://github.com/glue-viz/glue
     devdeps: git+https://github.com/glue-viz/glue-qt
     devdeps: git+https://github.com/glue-viz/glue-jupyter