diff --git a/src/AutoConnectDefs.h b/src/AutoConnectDefs.h
index d3ba53a..7309159 100644
--- a/src/AutoConnectDefs.h
+++ b/src/AutoConnectDefs.h
@@ -189,7 +189,7 @@
 #define AUTOCONNECT_UPDATE_DOWNLOAD   "/"
 #endif // !AUTOCONNECT_UPDATE_DOWNLOAD
 #ifndef AUTOCONNECT_UPDATE_CATALOG_JSONBUFFER_SIZE
-#define AUTOCONNECT_UPDATE_CATALOG_JSONBUFFER_SIZE  2048
+#define AUTOCONNECT_UPDATE_CATALOG_JSONBUFFER_SIZE  256
 #endif // !AUTOCONNECT_UPDATE_CATALOG_JSONBUFFER_SIZE
 
 // Default WebSocket port for the update progress measur
diff --git a/src/AutoConnectJsonDefs.h b/src/AutoConnectJsonDefs.h
index b1da00a..5abea17 100644
--- a/src/AutoConnectJsonDefs.h
+++ b/src/AutoConnectJsonDefs.h
@@ -23,6 +23,7 @@
  *   supported version.
  */
 #if ARDUINOJSON_VERSION_MAJOR<=5
+#define ArduinoJsonStaticBuffer           StaticJsonBuffer
 #define ARDUINOJSON_CREATEOBJECT(doc)     doc.createObject()
 #define ARDUINOJSON_CREATEARRAY(doc)      doc.createArray()
 #define ARDUINOJSON_PRETTYPRINT(doc, out) ({ size_t s = doc.prettyPrintTo(out); s; })
@@ -32,6 +33,7 @@ using ArduinoJsonArray = JsonArray&;
 using ArduinoJsonBuffer = DynamicJsonBuffer;
 #define AUTOCONNECT_JSONBUFFER_PRIMITIVE_SIZE AUTOCONNECT_JSONBUFFER_SIZE
 #else
+#define ArduinoJsonStaticBuffer           StaticJsonDocument
 #define ARDUINOJSON_CREATEOBJECT(doc)     doc.to<JsonObject>()
 #define ARDUINOJSON_CREATEARRAY(doc)      doc.to<JsonArray>()
 #define ARDUINOJSON_PRETTYPRINT(doc, out) ({ size_t s = serializeJsonPretty(doc, out); s; })