diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5453cd07..c00e7329 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,7 +39,6 @@ else()
   set(PROTOBUF_PURPOSE)
 endif()
 ign_find_package(IgnProtobuf
-                 VERSION ${REQ_PROTOBUF_VER}
                  REQUIRED
                  PRETTY Protobuf
                  PURPOSE ${PROTOBUF_PURPOSE})
diff --git a/include/ignition/transport/RepHandler.hh b/include/ignition/transport/RepHandler.hh
index 1163c3eb..e2cb5ca0 100644
--- a/include/ignition/transport/RepHandler.hh
+++ b/include/ignition/transport/RepHandler.hh
@@ -26,7 +26,7 @@
 #pragma warning(pop)
 #endif
 
-#if GOOGLE_PROTOBUF_VERSION > 2999999
+#if GOOGLE_PROTOBUF_VERSION > 2999999 && GOOGLE_PROTOBUF_VERSION < 4022000
 #include <google/protobuf/stubs/casts.h>
 #endif
 
@@ -127,7 +127,11 @@ namespace ignition
           return false;
         }
 
-#if GOOGLE_PROTOBUF_VERSION > 2999999
+#if GOOGLE_PROTOBUF_VERSION >= 4022000
+        auto msgReq =
+          google::protobuf::internal::DownCast<const Req*>(&_msgReq);
+        auto msgRep = google::protobuf::internal::DownCast<Rep*>(&_msgRep);
+#elif GOOGLE_PROTOBUF_VERSION > 2999999
         auto msgReq = google::protobuf::down_cast<const Req*>(&_msgReq);
         auto msgRep = google::protobuf::down_cast<Rep*>(&_msgRep);
 #else
diff --git a/include/ignition/transport/SubscriptionHandler.hh b/include/ignition/transport/SubscriptionHandler.hh
index d9fbd224..22486730 100644
--- a/include/ignition/transport/SubscriptionHandler.hh
+++ b/include/ignition/transport/SubscriptionHandler.hh
@@ -28,7 +28,7 @@
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION >= 3000000
+#if GOOGLE_PROTOBUF_VERSION >= 3000000 && GOOGLE_PROTOBUF_VERSION < 4022000
 #include <google/protobuf/stubs/casts.h>
 #endif
 
@@ -198,7 +198,9 @@ namespace ignition
         if (!this->UpdateThrottling())
           return true;
 
-#if GOOGLE_PROTOBUF_VERSION >= 3000000
+#if GOOGLE_PROTOBUF_VERSION >= 4022000
+        auto msgPtr = google::protobuf::internal::DownCast<const T*>(&_msg);
+#elif GOOGLE_PROTOBUF_VERSION >= 3000000
         auto msgPtr = google::protobuf::down_cast<const T*>(&_msg);
 #else
         auto msgPtr = google::protobuf::internal::down_cast<const T*>(&_msg);