diff --git a/schedules/gnu-alpha.go b/schedules/gnu-alpha.go
index e8cb533..df8bb5b 100644
--- a/schedules/gnu-alpha.go
+++ b/schedules/gnu-alpha.go
@@ -2,4 +2,4 @@ package schedules
 
 // katoptra/gnu-alpha is a mirror of GNU's alpha release tree. The scheduler starts it twice
 // a day.
-var _ = register(Job{Repo: "katoptra/gnu-alpha", File: "sync.yml", Slots: S3 | S15})
+var _ = register(Job{Repo: "katoptra/gnu-alpha", File: "sync.yml", Slots: S9 | S21})
diff --git a/schedules/nongnu.go b/schedules/nongnu.go
index 052b165..0be6324 100644
--- a/schedules/nongnu.go
+++ b/schedules/nongnu.go
@@ -2,4 +2,4 @@ package schedules
 
 // katoptra/nongnu is a mirror of Savannah's nongnu release tree. The scheduler starts it
 // twice a day.
-var _ = register(Job{Repo: "katoptra/nongnu", File: "sync.yml", Slots: S3 | S15})
+var _ = register(Job{Repo: "katoptra/nongnu", File: "sync.yml", Slots: S7 | S19})