diff --git a/docs/migration.md b/docs/migration.md
index b6ac0d8a..b282a90f 100644
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -8,6 +8,13 @@ icon: material/arrange-bring-forward
 
     This version is still under development, and the following migration guide may be changed in the future.
 
+### `domain_suffix` behavior update
+
+For historical reasons, sing-box's `domain_suffix` rule matches literal prefixes instead of the same as other projects.
+
+sing-box 1.9.0 modifies the behavior of `domain_suffix`: If the rule value is prefixed with `.`,
+the behavior is unchanged, otherwise it matches `(domain|.+\.domain)` instead.
+
 ### `process_path` format update on Windows
 
 The `process_path` rule of sing-box is inherited from Clash,
diff --git a/docs/migration.zh.md b/docs/migration.zh.md
index 9998349f..bd63bf17 100644
--- a/docs/migration.zh.md
+++ b/docs/migration.zh.md
@@ -8,6 +8,12 @@ icon: material/arrange-bring-forward
 
     该版本仍在开发中，迁移指南可能将在未来更改。
 
+### `domain_suffix` 行为更新
+
+由于历史原因，sing-box 的 `domain_suffix` 规则匹配字面前缀，而不与其他项目相同。
+
+sing-box 1.9.0 修改了 `domain_suffix` 的行为：如果规则值以 `.` 为前缀则行为不变，否则改为匹配 `(domain|.+\.domain)`。
+
 ### 对 Windows 上 `process_path` 格式的更新
 
 sing-box 的 `process_path` 规则继承自Clash，
diff --git a/go.mod b/go.mod
index af2b0d2e..f7a5d6a6 100644
--- a/go.mod
+++ b/go.mod
@@ -26,7 +26,7 @@ require (
 	github.com/sagernet/gvisor v0.0.0-20231209105102-8d27a30e436e
 	github.com/sagernet/quic-go v0.40.1
 	github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691
-	github.com/sagernet/sing v0.3.8
+	github.com/sagernet/sing v0.4.0-beta.20
 	github.com/sagernet/sing-dns v0.1.14
 	github.com/sagernet/sing-mux v0.2.0
 	github.com/sagernet/sing-quic v0.1.15
diff --git a/go.sum b/go.sum
index 09b6a53b..bf0d0c70 100644
--- a/go.sum
+++ b/go.sum
@@ -106,14 +106,12 @@ github.com/sagernet/quic-go v0.40.1/go.mod h1:CcKTpzTAISxrM4PA5M20/wYuz9Tj6Tx4Dw
 github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691 h1:5Th31OC6yj8byLGkEnIYp6grlXfo1QYUfiYFGjewIdc=
 github.com/sagernet/reality v0.0.0-20230406110435-ee17307e7691/go.mod h1:B8lp4WkQ1PwNnrVMM6KyuFR20pU8jYBD+A4EhJovEXU=
 github.com/sagernet/sing v0.2.18/go.mod h1:OL6k2F0vHmEzXz2KW19qQzu172FDgSbUSODylighuVo=
-github.com/sagernet/sing v0.3.8 h1:gm4JKalPhydMYX2zFOTnnd4TXtM/16WFRqSjMepYQQk=
-github.com/sagernet/sing v0.3.8/go.mod h1:+60H3Cm91RnL9dpVGWDPHt0zTQImO9Vfqt9a4rSambI=
+github.com/sagernet/sing v0.4.0-beta.20 h1:8rEepj4LMcR0Wd389fJIziv/jr3MBtX5qXBHsfxJ+dY=
+github.com/sagernet/sing v0.4.0-beta.20/go.mod h1:PFQKbElc2Pke7faBLv8oEba5ehtKO21Ho+TkYemTI3Y=
 github.com/sagernet/sing-dns v0.1.14 h1:kxE/Ik3jMXmD3sXsdt9MgrNzLFWt64mghV+MQqzyf40=
 github.com/sagernet/sing-dns v0.1.14/go.mod h1:AA+vZMNovuPN5i/sPnfF6756Nq94nzb5nXodMWbta5w=
 github.com/sagernet/sing-mux v0.2.0 h1:4C+vd8HztJCWNYfufvgL49xaOoOHXty2+EAjnzN3IYo=
 github.com/sagernet/sing-mux v0.2.0/go.mod h1:khzr9AOPocLa+g53dBplwNDz4gdsyx/YM3swtAhlkHQ=
-github.com/sagernet/sing-quic v0.1.14 h1:gzQAuvxDyh9oz3J595KchYpi0HcHOvQWeUG20FWc45A=
-github.com/sagernet/sing-quic v0.1.14/go.mod h1:L+VtzvuPbf8VW8F4R7KiygqpXY4lO7t2wwcQuHjh8Ew=
 github.com/sagernet/sing-quic v0.1.15 h1:LGWPxQEeg89+68RHP7HtAV0RZeEWQikUqOfE9nYmr2A=
 github.com/sagernet/sing-quic v0.1.15/go.mod h1:L+VtzvuPbf8VW8F4R7KiygqpXY4lO7t2wwcQuHjh8Ew=
 github.com/sagernet/sing-shadowsocks v0.2.6 h1:xr7ylAS/q1cQYS8oxKKajhuQcchd5VJJ4K4UZrrpp0s=