diff --git a/.changes/single-instance-dbus-name.md b/.changes/single-instance-dbus-name.md
new file mode 100644
index 00000000..18b8eea1
--- /dev/null
+++ b/.changes/single-instance-dbus-name.md
@@ -0,0 +1,6 @@
+---
+"single-instance": patch
+---
+
+Fix D-Bus name replacement logic on Linux to prevent multiple instances from acquiring the same well-known name.  
+This patch updates the `zbus` dependency to the latest compatible version (`^5.9`) and explicitly sets `RequestNameFlags` to ensure a second instance fails to acquire the D-Bus name when another one is already running.
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
index 62acfde8..23e1abf2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -404,17 +404,6 @@ dependencies = [
  "slab",
 ]
 
-[[package]]
-name = "async-fs"
-version = "2.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebcd09b382f40fcd159c2d695175b2ae620ffa5f3bd6f664131efff4e8b9e04a"
-dependencies = [
- "async-lock",
- "blocking",
- "futures-lite",
-]
-
 [[package]]
 name = "async-io"
 version = "2.4.0"
@@ -3702,9 +3691,9 @@ dependencies = [
 
 [[package]]
 name = "nix"
-version = "0.29.0"
+version = "0.30.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "71e2746dc3a24dd78b3cfcb7be93368c6de9963d30f43a6a73998a9cf4b17b46"
+checksum = "74523f3a35e05aba87a1d978330aef40f67b0304ac79c1c00b294c9830543db6"
 dependencies = [
  "bitflags 2.9.0",
  "cfg-if",
@@ -8844,16 +8833,6 @@ dependencies = [
  "rustix 1.0.5",
 ]
 
-[[package]]
-name = "xdg-home"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec1cdab258fb55c0da61328dc52c8764709b249011b2cad0454c72f0bf10a1f6"
-dependencies = [
- "libc",
- "windows-sys 0.59.0",
-]
-
 [[package]]
 name = "xkeysym"
 version = "0.2.1"
@@ -8886,13 +8865,12 @@ dependencies = [
 
 [[package]]
 name = "zbus"
-version = "5.5.0"
+version = "5.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59c333f648ea1b647bc95dc1d34807c8e25ed7a6feff3394034dc4776054b236"
+checksum = "4bb4f9a464286d42851d18a605f7193b8febaf5b0919d71c6399b7b26e5b0aad"
 dependencies = [
  "async-broadcast",
  "async-executor",
- "async-fs",
  "async-io",
  "async-lock",
  "async-process",
@@ -8905,17 +8883,15 @@ dependencies = [
  "futures-core",
  "futures-lite",
  "hex",
- "nix 0.29.0",
+ "nix 0.30.1",
  "ordered-stream",
  "serde",
  "serde_repr",
- "static_assertions",
  "tokio",
  "tracing",
  "uds_windows",
  "windows-sys 0.59.0",
  "winnow 0.7.6",
- "xdg-home",
  "zbus_macros",
  "zbus_names",
  "zvariant",
@@ -8923,9 +8899,9 @@ dependencies = [
 
 [[package]]
 name = "zbus_macros"
-version = "5.5.0"
+version = "5.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f325ad10eb0d0a3eb060203494c3b7ec3162a01a59db75d2deee100339709fc0"
+checksum = "ef9859f68ee0c4ee2e8cde84737c78e3f4c54f946f2a38645d0d4c7a95327659"
 dependencies = [
  "proc-macro-crate 3.3.0",
  "proc-macro2",
@@ -9123,14 +9099,13 @@ dependencies = [
 
 [[package]]
 name = "zvariant"
-version = "5.4.0"
+version = "5.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2df9ee044893fcffbdc25de30546edef3e32341466811ca18421e3cd6c5a3ac"
+checksum = "d91b3680bb339216abd84714172b5138a4edac677e641ef17e1d8cb1b3ca6e6f"
 dependencies = [
  "endi",
  "enumflags2",
  "serde",
- "static_assertions",
  "url",
  "winnow 0.7.6",
  "zvariant_derive",
@@ -9139,9 +9114,9 @@ dependencies = [
 
 [[package]]
 name = "zvariant_derive"
-version = "5.4.0"
+version = "5.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74170caa85b8b84cc4935f2d56a57c7a15ea6185ccdd7eadb57e6edd90f94b2f"
+checksum = "3a8c68501be459a8dbfffbe5d792acdd23b4959940fc87785fb013b32edbc208"
 dependencies = [
  "proc-macro-crate 3.3.0",
  "proc-macro2",
diff --git a/Cargo.toml b/Cargo.toml
index cfa616ca..2d1b4c0e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ schemars = "0.8"
 dunce = "1"
 specta = "^2.0.0-rc.16"
 glob = "0.3"
-zbus = "5"
+zbus = "5.9"
 
 [workspace.package]
 edition = "2021"
diff --git a/plugins/single-instance/src/platform_impl/linux.rs b/plugins/single-instance/src/platform_impl/linux.rs
index 3136074f..577965c5 100644
--- a/plugins/single-instance/src/platform_impl/linux.rs
+++ b/plugins/single-instance/src/platform_impl/linux.rs
@@ -61,6 +61,8 @@ pub fn init<R: Runtime>(f: Box<SingleInstanceCallback<R>>) -> TauriPlugin<R> {
                 .unwrap()
                 .name(dbus_name.as_str())
                 .unwrap()
+                .replace_existing_names(false)
+                .allow_name_replacements(false)
                 .serve_at(dbus_path.as_str(), single_instance_dbus)
                 .unwrap()
                 .build()