diff --git a/src/controller/controller_capabilities.cpp b/src/controller/controller_capabilities.cpp
index 215db106..063fc7ff 100644
--- a/src/controller/controller_capabilities.cpp
+++ b/src/controller/controller_capabilities.cpp
@@ -36,17 +36,25 @@ namespace Controller {
       if ((*it).substr(0, 7) == "MistOut"){
         arg_one = Util::getMyPath() + (*it);
         conn_args[0] = arg_one.c_str();
-        capabilities["connectors"][(*it).substr(7)] = JSON::fromString(Util::Procs::getOutputOf((char**)conn_args));
-        if (capabilities["connectors"][(*it).substr(7)].size() < 1){
-          capabilities["connectors"].removeMember((*it).substr(7));
+        std::string entryName = (*it).substr(7);
+        capabilities["connectors"][entryName] = JSON::fromString(Util::Procs::getOutputOf((char**)conn_args));
+        if (capabilities["connectors"][entryName].size() < 1){
+          capabilities["connectors"].removeMember(entryName);
+        }else if (capabilities["connectors"][entryName]["version"].asStringRef() != PACKAGE_VERSION){
+          WARN_MSG("Output %s version mismatch (%s != " PACKAGE_VERSION ")", entryName.c_str(), capabilities["connectors"][entryName]["version"].asStringRef().c_str());
+          capabilities["connectors"].removeMember(entryName);
         }
       }
       if ((*it).substr(0, 6) == "MistIn" && (*it) != "MistInfo"){
         arg_one = Util::getMyPath() + (*it);
         conn_args[0] = arg_one.c_str();
-        capabilities["inputs"][(*it).substr(6)] = JSON::fromString(Util::Procs::getOutputOf((char**)conn_args));
-        if (capabilities["inputs"][(*it).substr(6)].size() < 1){
+        std::string entryName = (*it).substr(6);
+        capabilities["inputs"][entryName] = JSON::fromString(Util::Procs::getOutputOf((char**)conn_args));
+        if (capabilities["inputs"][entryName].size() < 1){
           capabilities["inputs"].removeMember((*it).substr(6));
+        }else if (capabilities["inputs"][entryName]["version"].asStringRef() != PACKAGE_VERSION){
+          WARN_MSG("Input %s version mismatch (%s != " PACKAGE_VERSION ")", entryName.c_str(), capabilities["inputs"][entryName]["version"].asStringRef().c_str());
+          capabilities["inputs"].removeMember(entryName);
         }
       }
     }
diff --git a/src/input/input.cpp b/src/input/input.cpp
index efd66668..b78b6f83 100644
--- a/src/input/input.cpp
+++ b/src/input/input.cpp
@@ -98,6 +98,7 @@ namespace Mist {
     Util::Config::streamName = streamName;
    
     if (config->getBool("json")) {
+      capa["version"] = PACKAGE_VERSION;
       std::cout << capa.toString() << std::endl;
       return 0;
     }
diff --git a/src/output/mist_out.cpp b/src/output/mist_out.cpp
index b5d02796..a0432cce 100644
--- a/src/output/mist_out.cpp
+++ b/src/output/mist_out.cpp
@@ -15,6 +15,7 @@ int main(int argc, char * argv[]) {
   mistOut::init(&conf);
   if (conf.parseArgs(argc, argv)) {
     if (conf.getBool("json")) {
+      mistOut::capa["version"] = PACKAGE_VERSION;
       std::cout << mistOut::capa.toString() << std::endl;
       return -1;
     }