diff --git a/images/Makefile b/images/Makefile
index 051d1cb..7fb4718 100644
--- a/images/Makefile
+++ b/images/Makefile
@@ -1,9 +1,9 @@
 .PHONY: all
-all: pngcrush
+all: optipng
 	make -C ../asset
 
-.PHONY: pngcrush
-pngcrush: $(addprefix crushed/, $(wildcard *.png))
+.PHONY: optipng
+optipng: $(addprefix crushed/, $(wildcard *.png))
 
 crushed/%.png: %.png
-	pngcrush $< $@
+	optipng -o7 $< -out $@
diff --git a/images/crushed/background.png b/images/crushed/background.png
index 8bea1f0..c691ef5 100644
Binary files a/images/crushed/background.png and b/images/crushed/background.png differ
diff --git a/images/crushed/nochmal.png b/images/crushed/nochmal.png
index f46ccfd..434817d 100644
Binary files a/images/crushed/nochmal.png and b/images/crushed/nochmal.png differ
diff --git a/images/crushed/yuri-gagarin1.png b/images/crushed/yuri-gagarin1.png
index b186c10..ad1c6ae 100644
Binary files a/images/crushed/yuri-gagarin1.png and b/images/crushed/yuri-gagarin1.png differ