diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd748e9..e892272 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,12 +39,12 @@ jobs:
       - name: Build up-core-api conan package
         shell: bash
         run: |
-          conan create --version 1.6.0-alpha2 up-conan-recipes/up-core-api/release
+          conan create --version 1.6.0-alpha4 up-conan-recipes/up-core-api/release
 
       - name: Build up-cpp conan package
         shell: bash
         run: |
-          conan create --version 1.0.1 --build=missing up-conan-recipes/up-cpp/release
+          conan create --version 1.0.1-dev --build=missing up-conan-recipes/up-cpp/developer
 
       - name: Build zenohcpp conan package
         shell: bash
diff --git a/conanfile.txt b/conanfile.txt
index 042c163..ce2b80f 100644
--- a/conanfile.txt
+++ b/conanfile.txt
@@ -1,9 +1,9 @@
 [requires]
-up-cpp/[^1.0.1]
+up-cpp/[^1.0.1, include_prerelease]
 zenohcpp/1.2.1
 zenohc/1.2.1
 spdlog/[~1.13]
-up-core-api/[~1.6, include_prerelease]
+up-core-api/1.6.0-alpha4
 protobuf/[~3.21]
 
 [test_requires]
diff --git a/include/up-transport-zenoh-cpp/ZenohUTransport.h b/include/up-transport-zenoh-cpp/ZenohUTransport.h
index 3b3c38e..3a55165 100644
--- a/include/up-transport-zenoh-cpp/ZenohUTransport.h
+++ b/include/up-transport-zenoh-cpp/ZenohUTransport.h
@@ -93,7 +93,7 @@ struct ZenohUTransport : public UTransport {
 	/// @note The default implementation does nothing.
 	///
 	/// @param listener shared_ptr of the Connection that has been broken.
-	virtual void cleanupListener(CallableConn listener) override;
+	virtual void cleanupListener(const CallableConn& listener) override;
 
 	static std::string toZenohKeyString(
 	    const std::string& default_authority_name, const v1::UUri& source,
diff --git a/src/ZenohUTransport.cpp b/src/ZenohUTransport.cpp
index de5d042..ef07b29 100644
--- a/src/ZenohUTransport.cpp
+++ b/src/ZenohUTransport.cpp
@@ -281,7 +281,7 @@ v1::UStatus ZenohUTransport::registerListenerImpl(
 	return registerPublishNotificationListener_(zenoh_key, listener);
 }
 
-void ZenohUTransport::cleanupListener(CallableConn listener) {
+void ZenohUTransport::cleanupListener(const CallableConn& listener) {
 	subscriber_map_.erase(listener);
 }