diff --git a/README.md b/README.md
index cf03aa9..dc5b4ae 100644
--- a/README.md
+++ b/README.md
@@ -3,10 +3,8 @@
 A simple widget that can be attached to the `textclock` to show a monthly
 calendar.
 
-This widget is a simple wrapper around:
-
-- the `cal` utility if you are using **4.0** <= Awesome < **4.2**
-- `awful.widget.calendar_popup` if you are using Awesome >= **4.2**
+This widget is a simple wrapper around `awful.widget.calendar_popup` available
+in Awesome >= **4.2**
 
 Once the widget is attached to the `textclock` (or any other widget really),
 moving the mouse over the `textclock` will show a monthly calendar. The mouse
@@ -18,8 +16,6 @@ is quite quick to load.
 
 # Installation
 
-0. If you are using Awesome **4.x** less than **4.2**, ensure that the `cal`
-   utility from `util-linux` is available.
 1. Copy `calendar.lua` in your `~/.config/awesome/` folder (e.g. by cloning
    this repository)
 3. Restart Awesome (e.g. press `modkey + Control` or run `awesome-client
diff --git a/calendar.lua b/calendar.lua
index 7202be7..fef91bc 100644
--- a/calendar.lua
+++ b/calendar.lua
@@ -19,10 +19,8 @@
 
 --[[ A simple tooltip that shows the calendar that can be attached to a widget.
 
-  Supported Awesome Version: 4.x
+  Supported Awesome Version >= 4.2
 
-  If used with Awesome Version < 4.2 it requires the `cal` program from
-  `util-linux`, otherwise it will use the nicer awful.widget.calendar_popup
   Remember to `require` the widget **after** `beautiful.init` to ensure that
   the widget's style matches the theme.  ]]
 
@@ -35,127 +33,36 @@ local awful = require("awful")
 
 local calendar
 
-if awful.widget.calendar_popup then
-  calendar = awful.widget.calendar_popup.month({position="tr"})
-  function calendar:register(widget)
-    widget:connect_signal(
-      "mouse::enter",
-      function ()
-        self:toggle()
-    end)
-    widget:connect_signal(
-      "mouse::leave",
-      function ()
-        self:toggle()
-    end)
-    widget:buttons(awful.util.table.join(
-                  awful.button({}, 1, function ()
-                      self:call_calendar(-1)
-                  end),
-                  awful.button({}, 4, function ()
-                      self:call_calendar(-1)
-                  end),
-                  awful.button({}, 2, function ()
-                      self:call_calendar(0)
-                  end),
-                  awful.button({}, 3, function ()
-                      self:call_calendar(1)
-                  end),
-                  awful.button({}, 5, function ()
-                      self:call_calendar(1)
-                  end)
-    ))
-  end
-
-else
-
-  calendar = awful.tooltip({})
-
-  local cached_date = {
-    day = tonumber(os.date("%d")),
-    month = tonumber(os.date("%m")),
-    year = tonumber(os.date("%Y"))
-  }
-
-  function calendar:update()
-    local cmd = string.format(
-      "cal --color=never -m %s %s %s",
-      cached_date.day, cached_date.month, cached_date.year)
-
-    awful.spawn.easy_async(
-      cmd,
-      function (stdout, stderr, _, exitcode)
-        if exitcode == 0  then
-          self:set_markup(
-            string.format(
-              '<span font_desc="monospace">%s</span>',
-              stdout))
-        else
-          self:set_text(
-            string.format(
-              'An error occurred while calling "%s":\n\n%s',
-              cmd,
-              stderr))
-        end
-    end)
-
-  end
-
-  local function this_month(cal)
-    cached_date = {day = tonumber(os.date("%d")),
-                   month = tonumber(os.date("%m")),
-                   year = tonumber(os.date("%Y"))}
-    cal:update()
-  end
-
-  local function next_month(cal)
-    local nm = cached_date.month + 1
-    if nm > 12 then
-      cached_date.month = 1
-      cached_date.year = cached_date.year + 1
-    else
-      cached_date.month = nm
-    end
-    cal:update()
-  end
-
-  local function prev_month(cal)
-    local nm = cached_date.month - 1
-    if nm == 0 then
-      cached_date.month = 12
-      cached_date.year = cached_date.year - 1
-    else
-      cached_date.month = nm
-    end
-    cal:update()
-  end
-
-  function calendar:register(widget)
-    self:add_to_object(widget)
-    widget:connect_signal(
-      "mouse::enter",
-      function ()
-        this_month(self)
-    end)
-    widget:buttons(awful.util.table.join(
-                     awful.button({}, 1, function ()
-                         next_month(self)
-                     end),
-                     awful.button({}, 4, function ()
-                         next_month(self)
-                     end),
-                     awful.button({}, 2, function ()
-                         this_month(self)
-                     end),
-                     awful.button({}, 3, function ()
-                         prev_month(self)
-                     end),
-                     awful.button({}, 5, function ()
-                         prev_month(self)
-                     end)
-    ))
-  end
+calendar = awful.widget.calendar_popup.month({position="tr"})
 
+function calendar:register(widget)
+  widget:connect_signal(
+    "mouse::enter",
+    function ()
+      self:toggle()
+  end)
+  widget:connect_signal(
+    "mouse::leave",
+    function ()
+      self:toggle()
+  end)
+  widget:buttons(awful.util.table.join(
+                   awful.button({}, 1, function ()
+                       self:call_calendar(-1)
+                   end),
+                   awful.button({}, 4, function ()
+                       self:call_calendar(-1)
+                   end),
+                   awful.button({}, 2, function ()
+                       self:call_calendar(0)
+                   end),
+                   awful.button({}, 3, function ()
+                       self:call_calendar(1)
+                   end),
+                   awful.button({}, 5, function ()
+                       self:call_calendar(1)
+                   end)
+  ))
 end
 
 return calendar