diff --git a/.gitignore b/.gitignore
index 3a612b5..41ddad1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 /target
 /Cargo.lock
-.vagrant
 *.swp
-
+*.swo
+.DS_Store
diff --git a/dev b/dev
index 0e32354..6588873 100755
--- a/dev
+++ b/dev
@@ -7,8 +7,7 @@ from subprocess import call
 import sys
 
 try:
-    call(['docker', 'run', '-it', '--rm', '-v', os.getcwd() + ':/source',
-          'jimmycuadra/rust:1.14.0'])
+    call(['docker', 'run', '-it', '--rm', '-v', os.getcwd() + ':/src:cached',
+          '-w=/src', 'rust:1.20.0'])
 except OSError:
     print('Please install Docker.', file=sys.stderr)
-