diff --git a/pdfminer/image.py b/pdfminer/image.py
index e7b98e8..1f58019 100644
--- a/pdfminer/image.py
+++ b/pdfminer/image.py
@@ -45,7 +45,7 @@ class BMPWriter(object):
                 self.fp.write(struct.pack('BBBx', i, i, i))
         elif ncols == 256:
             # grayscale color table
-            for i in xrange(256):
+            for i in range(256):
                 self.fp.write(struct.pack('BBBx', i, i, i))
         self.pos0 = self.fp.tell()
         self.pos1 = self.pos0 + self.datasize
@@ -98,7 +98,7 @@ class ImageWriter(object):
             data = stream.get_data()
             i = 0
             width = (width+7)//8
-            for y in xrange(height):
+            for y in range(height):
                 bmp.write_line(y, data[i:i+width])
                 i += width
         elif image.bits == 8 and image.colorspace is LITERAL_DEVICE_RGB:
@@ -106,14 +106,14 @@ class ImageWriter(object):
             data = stream.get_data()
             i = 0
             width = width*3
-            for y in xrange(height):
+            for y in range(height):
                 bmp.write_line(y, data[i:i+width])
                 i += width
         elif image.bits == 8 and image.colorspace is LITERAL_DEVICE_GRAY:
             bmp = BMPWriter(fp, 8, width, height)
             data = stream.get_data()
             i = 0
-            for y in xrange(height):
+            for y in range(height):
                 bmp.write_line(y, data[i:i+width])
                 i += width
         else:
diff --git a/pdfminer/pdfdocument.py b/pdfminer/pdfdocument.py
index fce62cf..f8ac79d 100644
--- a/pdfminer/pdfdocument.py
+++ b/pdfminer/pdfdocument.py
@@ -208,7 +208,7 @@ class PDFXRefFallback(PDFXRef):
                 except PSEOF:
                     pass
                 n = min(n, len(objs)//2)
-                for index in xrange(n):
+                for index in range(n):
                     objid1 = objs[index*2]
                     self.offsets[objid1] = (objid, index, 0)
         return
@@ -254,7 +254,7 @@ class PDFXRefStream(PDFBaseXRef):
 
     def get_objids(self):
         for (start, nobjs) in self.ranges:
-            for i in xrange(nobjs):
+            for i in range(nobjs):
                 offset = self.entlen * i
                 ent = self.data[offset:offset+self.entlen]
                 f1 = nunpack(ent[:self.fl1], 1)
diff --git a/pdfminer/rijndael.py b/pdfminer/rijndael.py
index cdb630a..d1fd4c7 100644
--- a/pdfminer/rijndael.py
+++ b/pdfminer/rijndael.py
@@ -806,7 +806,7 @@ def rijndaelSetupDecrypt(key, keybits):
         j -= 4
     # apply the inverse MixColumn transform to all round keys but the first and the last:
     p = 0
-    for i in xrange(1, nrounds):
+    for i in range(1, nrounds):
         p += 4
         rk[p+0] = (
           Td0[Te4[(rk[p+0] >> 24)       ] & 0xff] ^