diff --git a/Cargo.lock b/Cargo.lock
index a79c2b1..e93983d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,55 +2,70 @@
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- "libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -60,262 +75,265 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
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+ "png 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -324,11 +342,30 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "kernel32-sys"
-version = "0.2.1"
+name = "itertools"
+version = "0.4.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "itoa"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "jpeg-decoder"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "kernel32-sys"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -344,50 +381,53 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "0.1.15"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "lazy_static"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "libc"
-version = "0.2.4"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libloading"
-version = "0.2.1"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "target_build_utils 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libz-sys"
-version = "1.0.0"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "linked-hash-map"
+version = "0.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "log"
-version = "0.3.4"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "lzw"
-version = "0.9.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -395,7 +435,18 @@ name = "malloc_buf"
 version = "0.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "memmap"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fs2 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -403,54 +454,131 @@ name = "miniz-sys"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "mmap"
-version = "0.1.1"
+name = "ndarray"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempdir 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itertools 0.4.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "nodrop"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "odds 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "num"
-version = "0.1.30"
+version = "0.1.35"
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 dependencies = [
- "rand 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-bigint 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-complex 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-rational 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-bigint"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-complex"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+]
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+[[package]]
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+ "num-traits 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
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+[[package]]
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+ "num-bigint 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.1.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "num_cpus"
+version = "0.2.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "objc"
-version = "0.1.8"
+version = "0.2.1"
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 dependencies = [
- "libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "malloc_buf 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "odds"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "osmesa-sys"
-version = "0.0.5"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "shared_library 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shared_library 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "piston"
-version = "0.16.0"
+version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "pistoncore-event_loop 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "pistoncore-input 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "pistoncore-window 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-event_loop 0.25.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-input 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pistoncore-window 0.22.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -460,12 +588,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "piston-gfx_texture"
-version = "0.7.0"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gfx 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "image 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "piston-texture 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gfx 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gfx_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.10.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-texture 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -473,9 +602,14 @@ name = "piston-shaders_graphics2d"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "piston-shaders_graphics2d"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "piston-texture"
-version = "0.3.0"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -488,24 +622,25 @@ dependencies = [
 
 [[package]]
 name = "piston2d-gfx_graphics"
-version = "0.17.0"
+version = "0.31.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "freetype-rs 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
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- "piston-gfx_texture 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "piston-shaders_graphics2d 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "piston2d-graphics 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "draw_state 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gfx 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-gfx_texture 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-shaders_graphics2d 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston2d-graphics 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rusttype 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shader_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "piston2d-graphics"
-version = "0.13.1"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "draw_state 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "piston-texture 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "piston-texture 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "piston-viewport 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "read_color 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "vecmath 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -513,112 +648,122 @@ dependencies = [
 
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-version = "0.22.0"
-source = "git+https://github.com/PistonDevelopers/opengl_graphics.git#34cd83d798d55beed0e9696c2b6b7343ae532b79"
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- "image 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fnv 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "freetype-rs 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gl 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.10.3 (registry+https://github.com/rust-lang/crates.io-index)",
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- "piston2d-graphics 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
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diff --git a/Cargo.toml b/Cargo.toml
index 96c8e61..3dbb27f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,13 +12,6 @@ path = "src/main.rs"
 [dependencies]
 rustc-serialize = "0.3"
 rand = "0.3.7"
-
-[dependencies.piston_window]
-git = "https://github.com/pistondevelopers/piston_window"
-
-[dependencies.piston2d-opengl_graphics]
-git = "https://github.com/PistonDevelopers/opengl_graphics.git"
-
-[dependencies.pistoncore-sdl2_window]
-git = "https://github.com/pistondevelopers/sdl2_window"
-
+piston_window = "0.52.0"
+pistoncore-sdl2_window = "0.34.0"
+piston2d-opengl_graphics = "0.32.0"
diff --git a/src/app.rs b/src/app.rs
index a42d284..a32f01f 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -37,13 +37,13 @@ impl<'a> App<'a> {
     fn render_ui(&self, c: &Context, gl: &mut GlGraphics) {		
         Image::new_color(rgb2rgba(self.settings.text_dark_color))
             .draw(self.logo.iter().next().unwrap(),
-                  default_draw_state(),
+                  &DrawState::default(),
                   c.trans(self.settings.board_padding,self.settings.board_padding).transform,
                   gl);
 
         Rectangle::new(rgb2rgba(self.settings.label_color))
             .draw(self.settings.best_rect,
-                  default_draw_state(),
+                  &DrawState::default(),
                   c.transform,
                   gl);
 
@@ -63,7 +63,7 @@ impl<'a> App<'a> {
         Image::new_color(rgb2rgba(settings.text_dark_color))
             .rect([settings.board_padding, y, w, h])
             .draw( comment,
-                   default_draw_state(),
+                   &DrawState::default(),
                    c.transform,
                    gl);
     }
diff --git a/src/board.rs b/src/board.rs
index e36fe87..f9d2033 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -402,7 +402,7 @@ impl<'a> Board<'a> {
             self.settings.board_padding + self.settings.board_offset_y,
             self.settings.board_size[0],
             self.settings.board_size[1]],
-            default_draw_state(),
+            &DrawState::default(),
             c.transform,
             gl);
 
@@ -414,7 +414,7 @@ impl<'a> Board<'a> {
                 Rectangle::new(
                     rgb2rgba(self.settings.tiles_colors[0]))
                     .draw([x, y, self.settings.tile_size, self.settings.tile_size],
-                    default_draw_state(),
+                    &DrawState::default(),
                     c.transform,
                     gl);
 
diff --git a/src/main.rs b/src/main.rs
index 4591c8f..d3ae7d8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -20,10 +20,10 @@ fn main() {
 	let (width, height) = (settings.window_size[0], 
 	                       settings.window_size[1]);
 
-    let window: PistonWindow<(), Sdl2Window> = 
+    // according to piston WindowSettings documentation, OpenGL::V3_2 is the default version
+    let mut window: PistonWindow<Sdl2Window> =
         WindowSettings::new("Rust-2048", [width, height])
             .exit_on_esc(true)
-            .opengl(OpenGL::V3_2)
             .build()
             .unwrap_or_else(|e| { panic!("Failed to build PistonWindow: {}", e) });
 
@@ -33,7 +33,7 @@ fn main() {
 
     let mut gl = GlGraphics::new(OpenGL::V3_2);
 
-    for e in window.events() {
+    while let Some(e) = window.next() {
         if let Some(ref args) = e.render_args() {
             app.render(args, &mut gl);
         }
diff --git a/src/number_renderer.rs b/src/number_renderer.rs
index 7c0324c..6f18468 100644
--- a/src/number_renderer.rs
+++ b/src/number_renderer.rs
@@ -36,7 +36,7 @@ impl NumberRenderer {
                 .src_rect([(*digit * DIGITS_WIDTH as u32) as i32, 0, DIGITS_WIDTH as i32, DIGITS_HEIGHT as i32])
                 .rect([x, y, width, height])
                 .draw(&self.image,
-                      default_draw_state(),
+                      &DrawState::default(),
                       c.transform,
                       gl);
 
diff --git a/src/tile.rs b/src/tile.rs
index 3878a25..0704aba 100644
--- a/src/tile.rs
+++ b/src/tile.rs
@@ -127,7 +127,7 @@ impl<'a> Tile<'a> {
             .draw(rectangle::centered([x + self.settings.tile_size / 2.0,
                                        y + self.settings.tile_size / 2.,
                                        w/2.0, h/2.0]),
-                  default_draw_state(),
+                  &DrawState::default(),
                   c.transform,
                   gl);