diff --git a/go.mod b/go.mod
index d2598761b..136df3f86 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/gopherjs/gopherwasm v1.0.1
 	github.com/hajimehoshi/bitmapfont v1.1.1
 	github.com/hajimehoshi/go-mp3 v0.1.1
-	github.com/hajimehoshi/oto v0.2.1
+	github.com/hajimehoshi/oto v0.2.2
 	github.com/jakecoffman/cp v0.1.0
 	github.com/jfreymuth/oggvorbis v1.0.0
 	github.com/jfreymuth/vorbis v1.0.0 // indirect
@@ -15,7 +15,7 @@ require (
 	golang.org/x/image v0.0.0-20180926015637-991ec62608f3
 	golang.org/x/mobile v0.0.0-20180907224111-0ff817254b04
 	golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 // indirect
-	golang.org/x/sys v0.0.0-20180814072032-4e1fef560951
+	golang.org/x/sys v0.0.0-20190109145017-48ac38b7c8cb
 	golang.org/x/tools v0.0.0-20181023010539-40a48ad93fbe // indirect
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )
diff --git a/go.sum b/go.sum
index a423912fd..8ea59411f 100644
--- a/go.sum
+++ b/go.sum
@@ -21,6 +21,8 @@ github.com/hajimehoshi/go-mp3 v0.1.1/go.mod h1:4i+c5pDNKDrxl1iu9iG90/+fhP37lio6g
 github.com/hajimehoshi/oto v0.1.1/go.mod h1:hUiLWeBQnbDu4pZsAhOnGqMI1ZGibS6e2qhQdfpwz04=
 github.com/hajimehoshi/oto v0.2.1 h1:8mn8yNgLE/irztYCw8iBaGMb2oxXwaNqDh85j9fk+X8=
 github.com/hajimehoshi/oto v0.2.1/go.mod h1:0ZepxT+2KLDrCm1gdkKBCQCxr+8fgQqoh0I7g+kr040=
+github.com/hajimehoshi/oto v0.2.2 h1:zxgxTpUtl5iXIG/i6mTPqq9nSDeqKORh+04bDY3IeBY=
+github.com/hajimehoshi/oto v0.2.2/go.mod h1:e9eTLBB9iZto045HLbzfHJIc+jP3xaKrjZTghvb6fdM=
 github.com/jakecoffman/cp v0.1.0 h1:sgSYEGUgfwiT447fRjloa2c5b6UyYP+7muR3gQK+Ep0=
 github.com/jakecoffman/cp v0.1.0/go.mod h1:a3xPx9N8RyFAACD644t2dj/nK4SuLg1v+jL61m2yVo4=
 github.com/jfreymuth/oggvorbis v1.0.0 h1:aOpiihGrFLXpsh2osOlEvTcg5/aluzGQeC7m3uYWOZ0=
@@ -48,6 +50,8 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sys v0.0.0-20180806082429-34b17bdb4300/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180814072032-4e1fef560951 h1:VfGaXvV9wRnTJreeGDE0FWEDiQP1WWUDmutCjCThDz8=
 golang.org/x/sys v0.0.0-20180814072032-4e1fef560951/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181228144115-9a3f9b0469bb/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190109145017-48ac38b7c8cb/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/tools v0.0.0-20181023010539-40a48ad93fbe h1:i8YNi6USHuTcWHQPvNjvHY7JmkAmn1MnN/ISnPD/ZHc=
 golang.org/x/tools v0.0.0-20181023010539-40a48ad93fbe/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=