diff --git a/.changeset/patient-elks-glide.md b/.changeset/patient-elks-glide.md
new file mode 100644
index 000000000..8acffccaa
--- /dev/null
+++ b/.changeset/patient-elks-glide.md
@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 4059
+---
+**Raised the emitted-drift acknowledgment cap from 64 to 128** — a wide-touching maintenance PR could legitimately accumulate more distinct commit-trailer acknowledgments than the old ceiling allowed, failing CI even though nothing was wrong. (#4058)
diff --git a/tests/helpers/emitted-diff.cjs b/tests/helpers/emitted-diff.cjs
index b887e0b2d..0af54ec34 100644
--- a/tests/helpers/emitted-diff.cjs
+++ b/tests/helpers/emitted-diff.cjs
@@ -646,7 +646,7 @@ function formatReport(result, { sampleLimit = 20 } = {}) {
  */
 
 /** Upper bound on trailers read from one range. Real implementation throws above this. */
-const MAX_ACK_TRAILERS = 64;
+const MAX_ACK_TRAILERS = 128;
 
 /**
  * Parse trailer VALUES already extracted per trailer name (no git I/O — the two