diff --git a/v5/conanfile.py b/v5/conanfile.py
index 24f3ae6..724a9d7 100644
--- a/v5/conanfile.py
+++ b/v5/conanfile.py
@@ -62,7 +62,7 @@ def build_requirements(self):
         self.test_requires("boost-ext-ut/2.1.0")
 
     def requirements(self):
-        self.requires("libhal/[>4 <=4.18.0]", transitive_headers=True)
+        self.requires("libhal/[^4.18.1]", transitive_headers=True)
 
     def layout(self):
         cmake_layout(self)
diff --git a/v5/tests/can.test.cpp b/v5/tests/can.test.cpp
index e80d9b5..d92c71c 100644
--- a/v5/tests/can.test.cpp
+++ b/v5/tests/can.test.cpp
@@ -406,7 +406,7 @@ boost::ut::suite<"can_bus_manager_adapter"> can_bus_manager_adapter = [] {
         calls.filter_mode_param = p_accept;
       }
 
-      void driver_on_bus_off(optional_bus_off_handler& p_callback) override
+      void driver_on_bus_off(optional_bus_off_handler p_callback) override
       {
         calls.on_bus_off_called = true;
         calls.on_bus_off_param_has_value = p_callback.has_value();