diff --git a/renovate.json b/renovate.json
deleted file mode 100644
index 796909d..0000000
--- a/renovate.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "addLabels": ["renovate", "dependencies"],
-  "assigneesFromCodeOwners": true,
-  "automerge": true,
-  "automergeType": "pr",
-  "dependencyDashboard": true,
-  "enabledManagers": ["leiningen"]
-}
diff --git a/renovate.jsonc b/renovate.jsonc
new file mode 100644
index 0000000..b362b72
--- /dev/null
+++ b/renovate.jsonc
@@ -0,0 +1,21 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "addLabels": ["renovate", "dependencies"],
+  "assigneesFromCodeOwners": true,
+  "automerge": true,
+  "automergeType": "pr",
+  "dependencyDashboard": true,
+  "enabledManagers": ["leiningen"],
+
+  "packageRules": [
+    // Lock JRuby to the 9.4 release series. Moving to 10.0 will
+    // be a major version change.
+    {
+      "groupName": "jruby updates",
+      "allowedVersions": "<10.0",
+      "matchPackageNames": [
+        "org.jruby:*"
+      ]
+    }
+  ]
+}