diff --git a/.github/renovate.json b/.github/renovate.json
index 2c2a138ed..e6920b62b 100644
--- a/.github/renovate.json
+++ b/.github/renovate.json
@@ -7,6 +7,12 @@
       "groupName": "flake inputs",
       "semanticCommitScope": "flake",
       "automerge": true
+    },
+    {
+      "description": "Matches the unicode-width bound in Cargo.toml, which explains it.",
+      "matchManagers": ["cargo"],
+      "matchPackageNames": ["unicode-width"],
+      "allowedVersions": "<0.2.3"
     }
   ]
 }
diff --git a/Cargo.toml b/Cargo.toml
index bd9e8551e..d40725b5b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -118,7 +118,11 @@ tree-sitter = "0.27"
 tree-sitter-bash = "0.25"
 unicode-normalization = "0.1"
 unicode-segmentation = "1"
-unicode-width = "0.2"
+# ratatui-core 0.1.2 adds a cell to each halfwidth katakana sound mark (U+FF9E, U+FF9F) because
+# older unicode-width releases count it as zero-width. From 0.2.3, unicode-width counts it as one
+# cell, so ratatui lays the mark out over two cells while terminals draw it in one.
+# `.github/renovate.json` holds Renovate to the same bound.
+unicode-width = ">=0.2, <0.2.3"
 url = "2"
 uuid = { version = "1", features = ["serde", "v4"] }
 winapi-util = "0.1"