diff --git a/CMakeLists.txt b/CMakeLists.txt
index 342e07d..d1a3de8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 #
 # project: v6502r
 #
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.20)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_C_STANDARD 99)
 project(v6502r)
diff --git a/src/2a03/shell.html b/src/2a03/shell.html
index b8d7788..c8a188e 100644
--- a/src/2a03/shell.html
+++ b/src/2a03/shell.html
@@ -35,7 +35,6 @@
   <script type="text/javascript">
     var Module = {
         preRun: [],
-        postRun: [],
         print: (function() {
             return function(text) {
                 text = Array.prototype.slice.call(arguments).join(' ');
@@ -46,13 +45,6 @@
             text = Array.prototype.slice.call(arguments).join(' ');
             console.error(text);
         },
-        canvas: (function() {
-            var canvas = document.getElementById('canvas');
-            canvas.addEventListener("webglcontextlost", function(e) { alert('FIXME: WebGL context lost, please reload the page'); e.preventDefault(); }, false);
-            return canvas;
-        })(),
-        setStatus: function(text) { },
-        monitorRunDependencies: function(left) { }
     };
     window.onerror = function(event) {
         console.log("onerror: " + event.message);
diff --git a/src/m6502/shell.html b/src/m6502/shell.html
index f1292e7..94bb5bb 100644
--- a/src/m6502/shell.html
+++ b/src/m6502/shell.html
@@ -35,7 +35,6 @@
   <script type="text/javascript">
     var Module = {
         preRun: [],
-        postRun: [],
         print: (function() {
             return function(text) {
                 text = Array.prototype.slice.call(arguments).join(' ');
@@ -46,13 +45,6 @@
             text = Array.prototype.slice.call(arguments).join(' ');
             console.error(text);
         },
-        canvas: (function() {
-            var canvas = document.getElementById('canvas');
-            canvas.addEventListener("webglcontextlost", function(e) { alert('FIXME: WebGL context lost, please reload the page'); e.preventDefault(); }, false);
-            return canvas;
-        })(),
-        setStatus: function(text) { },
-        monitorRunDependencies: function(left) { }
     };
     window.onerror = function(event) {
         console.log("onerror: " + event.message);
diff --git a/src/z80/shell.html b/src/z80/shell.html
index 72572fe..2662b99 100644
--- a/src/z80/shell.html
+++ b/src/z80/shell.html
@@ -35,7 +35,6 @@
   <script type="text/javascript">
     var Module = {
         preRun: [],
-        postRun: [],
         print: (function() {
             return function(text) {
                 text = Array.prototype.slice.call(arguments).join(' ');
@@ -46,13 +45,6 @@
             text = Array.prototype.slice.call(arguments).join(' ');
             console.error(text);
         },
-        canvas: (function() {
-            var canvas = document.getElementById('canvas');
-            canvas.addEventListener("webglcontextlost", function(e) { alert('FIXME: WebGL context lost, please reload the page'); e.preventDefault(); }, false);
-            return canvas;
-        })(),
-        setStatus: function(text) { },
-        monitorRunDependencies: function(left) { }
     };
     window.onerror = function(event) {
         console.log("onerror: " + event.message);