diff --git a/wx/lib/agw/rulerctrl.py b/wx/lib/agw/rulerctrl.py
index eaf27dd4..baad2bc8 100644
--- a/wx/lib/agw/rulerctrl.py
+++ b/wx/lib/agw/rulerctrl.py
@@ -257,7 +257,7 @@ def ConvertWXToPIL(bmp):
 
     width = bmp.GetWidth()
     height = bmp.GetHeight()
-    img = Image.fromstring("RGBA", (width, height), bmp.GetData())
+    img = Image.frombytes("RGBA", (width, height), bmp.GetData())
 
     return img
 
@@ -276,12 +276,12 @@ def ConvertPILToWX(pil, alpha=True):
 
     if alpha:
         image = wx.Image(*pil.size)
-        image.SetData(pil.convert("RGB").tostring())
-        image.SetAlpha(pil.convert("RGBA").tostring()[3::4])
+        image.SetData(pil.convert("RGB").tobytes())
+        image.SetAlpha(pil.convert("RGBA").tobytes()[3::4])
     else:
         image = wx.Image(pil.size[0], pil.size[1])
         new_image = pil.convert('RGB')
-        data = new_image.tostring()
+        data = new_image.tobytes()
         image.SetData(data)
 
     return image
diff --git a/wx/lib/agw/shapedbutton.py b/wx/lib/agw/shapedbutton.py
index 18a4a5aa..fcce5296 100644
--- a/wx/lib/agw/shapedbutton.py
+++ b/wx/lib/agw/shapedbutton.py
@@ -909,7 +909,7 @@ class SButton(wx.Window):
 
         width = bmp.GetWidth()
         height = bmp.GetHeight()
-        img = Image.fromstring("RGBA", (width, height), bmp.GetData())
+        img = Image.frombytes("RGBA", (width, height), bmp.GetData())
 
         return img
 
@@ -925,12 +925,12 @@ class SButton(wx.Window):
 
         if alpha:
             image = wx.Image(*pil.size)
-            image.SetData(pil.convert("RGB").tostring())
-            image.SetAlpha(pil.convert("RGBA").tostring()[3::4])
+            image.SetData(pil.convert("RGB").tobytes())
+            image.SetAlpha(pil.convert("RGBA").tobytes()[3::4])
         else:
             image = wx.Image(pil.size[0], pil.size[1])
             new_image = pil.convert('RGB')
-            data = new_image.tostring()
+            data = new_image.tobytes()
             image.SetData(data)
 
         return image
diff --git a/wx/lib/agw/thumbnailctrl.py b/wx/lib/agw/thumbnailctrl.py
index 227ac517..d0511803 100644
--- a/wx/lib/agw/thumbnailctrl.py
+++ b/wx/lib/agw/thumbnailctrl.py
@@ -506,7 +506,7 @@ class PILImageHandler(object):
         import PIL.ImageEnhance as ImageEnhance
 
         pil = Image.new('RGB', (img.GetWidth(), img.GetHeight()))
-        pil.fromstring(img.GetData())
+        pil.frombytes(img.GetData())
         enh = ImageEnhance.Brightness(pil)
         enh = enh.enhance(1.5)
         img.SetData(enh.convert('RGB').tobytes())