diff --git a/.changeset/spec-sync-dokimasia-assert-spec.md b/.changeset/spec-sync-dokimasia-assert-spec.md
new file mode 100644
index 0000000..665c048
--- /dev/null
+++ b/.changeset/spec-sync-dokimasia-assert-spec.md
@@ -0,0 +1,4 @@
+---
+---
+
+Sync the vendored copy of assert-spec to 11.0.0.
diff --git a/crates/dokimi-assert-conformance/manifest.json b/crates/dokimi-assert-conformance/manifest.json
index 1241310..e01bddc 100644
--- a/crates/dokimi-assert-conformance/manifest.json
+++ b/crates/dokimi-assert-conformance/manifest.json
@@ -1,5 +1,5 @@
 {
-    "commit": "1e200ee3ca0081a1a8623a8a28c5b9e450fa9e84",
+    "commit": "8d23fe3ac8240894f1862abdeb250424aef30a00",
     "digest": "sha256:44a2597acc6eeffff861ff08f44db1c8c570d5ab5749596efb8e02cf3deaad5f",
     "files": {
         "VERSION": "sha256:7bd6bcbe3813e0cd55e0998053d182b7bc8c97dcfd0b85028e9f7f55af4ad61b",