diff --git a/.github/renovate.json5 b/.github/renovate.json5
index 20a193c..3a77323 100644
--- a/.github/renovate.json5
+++ b/.github/renovate.json5
@@ -42,6 +42,13 @@
             minimumReleaseAge: "3 days",
             automerge: true
         },
+        {
+            // pulldown-cmark and pulldown-cmark-to-mark must be updated in
+            // lockstep in case of breaking changes, so it's best to group them
+            // together.
+            "matchPackagePatterns": ["^pulldown-cmark.*"],
+            "groupName": "pulldown-cmark"
+        },
   ],
   ignorePaths: [
     // Auto-generated by cargo-dist (https://opensource.axo.dev/cargo-dist/)