diff --git a/pyproject.toml b/pyproject.toml
index a974fdc..225c740 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,7 @@ classifiers = [
 ]
 dependencies = [
     "astropy>=5.2",
+    "glue-core<1.19.0",
     # NOTE: if/when we stop pinning a minor version of jdaviz, add jdaviz
     # to devdeps in tox.ini
     "jdaviz==3.9.*",