diff --git a/_service b/_service
index f72b38c..91eeb72 100644
--- a/_service
+++ b/_service
@@ -1,7 +1,7 @@
 <services>
   <service name="tar_scm" mode="disabled">
     <param name="filename">unison</param>
-    <param name="revision">eae947ee7a6076592ec711e4c090438ab6ead211</param>
+    <param name="revision">81e1054d2f6a4c6e41bc7ac569cf995e826bb014</param>
     <param name="scm">git</param>
     <param name="subdir">src</param>
     <param name="submodules">disable</param>
diff --git a/unison-2.51.4_rc3.tar.xz b/unison-2.51.4_rc3.tar.xz
index eafdbf4..e2bedab 100644
--- a/unison-2.51.4_rc3.tar.xz
+++ b/unison-2.51.4_rc3.tar.xz
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:9f8f73faf98ae429699078312b9eb118ca7a388214123c27734d0824de109fd8
-size 489500
+oid sha256:928c8190f0b0a63ec9fd42791501c2e173ba86bea175542c842b830086874ad1
+size 489388