diff --git a/.travis.yml b/.travis.yml
index 4547f47..f65db78 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,8 @@ branches:
         - master
 
 python:
-    - "2.7"
     - "3.4"
+    - "3.9"
 
 addons:
     apt:
diff --git a/LICENSE b/LICENSE
index 4c60d35..2074573 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2016-2017, Jan Varho
+Copyright (c) 2016-2020, Jan Varho
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted, provided that the above
diff --git a/Makefile b/Makefile
index 7da6c0b..0721daa 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,10 @@
-testall:
-	python2 rencfs-test.py
-	python3 rencfs-test.py
-
 test:
-	python rencfs-test.py
+	python3 rencfs-test.py
 
 coveralls:
-	python -m coverage run --branch rencfs-test.py
+	python3 -m coverage run --branch rencfs-test.py
 
 coverage:
-	python -m coverage run --branch rencfs-test.py
-	python -m coverage report --include=rencfs.py
-	python -m coverage html --include=rencfs.py
+	python3 -m coverage run --branch rencfs-test.py
+	python3 -m coverage report --include=rencfs.py
+	python3 -m coverage html --include=rencfs.py
diff --git a/README b/README
index b61692b..6175a4e 100644
--- a/README
+++ b/README
@@ -12,7 +12,7 @@ Installation:
 ---
 
 Requires:
-* Python 2.7 or 3.4+
+* Python 3.4+
 * fusepy, e.g. `pip install fusepy`
 
 One of:
diff --git a/aes.py b/aes.py
old mode 100644
new mode 100755
index aaa0115..28398da
--- a/aes.py
+++ b/aes.py
@@ -1,6 +1,6 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
-# Copyright (c) 2017, Jan Varho
+# Copyright (c) 2017-2020, Jan Varho
 #
 # Permission to use, copy, modify, and/or distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
@@ -65,3 +65,10 @@ def pycrypto_aes_ctr(key, index):
     pycrypto_aes_ecb(b'\1'*16)
     aes_ecb = pycrypto_aes_ecb
     aes_ctr = pycrypto_aes_ctr
+
+if __name__ == '__main__': #pragma no cover
+    a = aes_ecb(b'\1'*16).encrypt(b'\0'*16)
+    b = aes_ctr(b'\1'*16, 0).encrypt(b'\0'*16)
+    c = aes_ctr(b'\1'*16, 1).encrypt(b'\0'*16)
+    assert a == b
+    assert a != c
diff --git a/rencfs-test.py b/rencfs-test.py
old mode 100644
new mode 100755
index e261fec..2ede28d
--- a/rencfs-test.py
+++ b/rencfs-test.py
@@ -1,6 +1,6 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
-# Copyright (c) 2016, Jan Varho
+# Copyright (c) 2016-2020, Jan Varho
 #
 # Permission to use, copy, modify, and/or distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
@@ -17,7 +17,11 @@
 import os
 from os import urandom, R_OK, W_OK, X_OK
 from unittest import defaultTestLoader, TestCase, TestSuite, TextTestRunner
-from fuse import FuseOSError
+
+try:
+    from fusepy import FUSE, FuseOSError, Operations
+except ImportError:
+    from fuse import FUSE, FuseOSError, Operations
 
 from rencfs import RencFSEncrypt, RencFSDecrypt
 
diff --git a/rencfs.py b/rencfs.py
index e5226ca..8786dcc 100755
--- a/rencfs.py
+++ b/rencfs.py
@@ -1,6 +1,6 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
-# Copyright (c) 2016-2017, Jan Varho
+# Copyright (c) 2016-2020, Jan Varho
 #
 # Permission to use, copy, modify, and/or distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
@@ -27,12 +27,15 @@
 from base64 import b16encode
 from hashlib import sha256
 
-from fuse import FUSE, FuseOSError, Operations
+try:
+    from fusepy import FUSE, FuseOSError, Operations
+except ImportError:
+    from fuse import FUSE, FuseOSError, Operations
 
 from aes import aes_ctr, aes_ecb
 
 
-__version__ = '0.6'
+__version__ = '0.7'
 
 BLOCK_MASK = 15
 BLOCK_SIZE = 16