diff --git a/bootstrap.sh b/bootstrap.sh
index 6a2a7a0..6b36cbf 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -10,19 +10,19 @@ if [ "$?" = 0 ]; then
     exit 0
 fi
 
-go get github.com/szferi/gomdb
+go get -u github.com/szferi/gomdb
 
-go get github.com/boltdb/bolt
+go get -u github.com/boltdb/bolt
 
-go get github.com/ugorji/go/codec
-go get github.com/BurntSushi/toml
-go get github.com/edsrzf/mmap-go
+go get -u github.com/ugorji/go/codec
+go get -u github.com/BurntSushi/toml
+go get -u github.com/edsrzf/mmap-go
 
-go get github.com/siddontang/goleveldb/leveldb
-go get github.com/siddontang/go/bson
-go get github.com/siddontang/go/log
-go get github.com/siddontang/go/snappy
-go get github.com/siddontang/go/num
-go get github.com/siddontang/go/filelock
-go get github.com/siddontang/go/sync2
-go get github.com/siddontang/go/arena
+go get -u github.com/siddontang/goleveldb/leveldb
+go get -u github.com/siddontang/go/bson
+go get -u github.com/siddontang/go/log
+go get -u github.com/siddontang/go/snappy
+go get -u github.com/siddontang/go/num
+go get -u github.com/siddontang/go/filelock
+go get -u github.com/siddontang/go/sync2
+go get -u github.com/siddontang/go/arena