diff --git a/memory.cpp b/memory.cpp
index 0d00503..8dfda75 100644
--- a/memory.cpp
+++ b/memory.cpp
@@ -40,30 +40,29 @@ void memory::reset()
 	memset(m, 0x00, size);
 }
 
-#if IS_POSIX
-json_t *memory::serialize() const
+JsonDocument memory::serialize() const
 {
-	json_t *j = json_object();
+	JsonDocument j;
 
-	json_object_set(j, "size", json_integer(size));
+	j["size"] = size;
 
-	json_t *ja = json_array();
+	JsonArray ja;
 	for(size_t i=0; i<size; i++)
-		json_array_append(ja, json_integer(m[i]));
-	json_object_set(j, "contents", ja);
+		ja.add(m[i]);
+	j["contents"] = ja;
 
 	return j;
 }
 
 memory *memory::deserialize(const json_t *const j)
 {
-	size_t  size = json_integer_value(json_object_get(j, "size"));
+	size_t  size = j["size"];
 	memory *m    = new memory(size);
 
-	json_t *ja   = json_object_get(j, "contents");
-	for(size_t i=0; i<size; i++)
-		m->m[i] = json_integer_value(json_array_get(ja, i));
+	JsonArray ja = j["contents"];
+	uint32_t  i  = 0;
+	for(auto v: ja)
+		m->m[i++] = v;
 
 	return m;
 }
-#endif
diff --git a/memory.h b/memory.h
index 297d7f7..740fbd8 100644
--- a/memory.h
+++ b/memory.h
@@ -2,6 +2,7 @@
 // Released under MIT license
 
 #pragma once
+#include <ArduinoJson.h>
 #include <cstdint>
 
 #include "gen.h"
@@ -20,10 +21,9 @@ public:
 	uint32_t get_memory_size() const { return size; }
 
 	void reset();
-#if IS_POSIX
-	json_t *serialize() const;
-	static memory *deserialize(const json_t *const j);
-#endif
+
+	JsonDocument serialize() const;
+	static memory *deserialize(const JsonDocument j);
 
 	uint16_t read_byte(const uint32_t a) const { return m[a]; }
 	void write_byte(const uint32_t a, const uint16_t v) { if (a < size) m[a] = v; }