diff --git a/Pipfile b/Pipfile
index 08d34fee..4e006dd2 100644
--- a/Pipfile
+++ b/Pipfile
@@ -21,7 +21,7 @@ traitlets = ">=5.1.1"
 [packages]
 nbconvert = ">=5.0"
 nbformat = "*"
-notebook = ">=6.1.5"
+notebook = ">=6.1.5, <7.0.0"
 rsconnect-python = ">=1.7.1"
 six = "*"
 # Dependabot fixes
diff --git a/setup.cfg b/setup.cfg
index d27b87c5..18794109 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,7 +17,7 @@ project_urls =
 [options]
 install_requires =
     rsconnect-python>=1.7.1
-    notebook
+    notebook>=6.1.5,<7.0.0
     nbformat
     nbconvert>=5.6.1
     six