diff --git a/go.mod b/go.mod
index 697f4bb..1ef7150 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/gocnn/gym
 
 go 1.25
 
-require github.com/hajimehoshi/ebiten/v2 v2.9.7
+require github.com/hajimehoshi/ebiten/v2 v2.9.8
 
 require (
 	github.com/ebitengine/gomobile v0.0.0-20250923094054-ea854a63cce1 // indirect
diff --git a/go.sum b/go.sum
index 4d689fb..0bc932f 100644
--- a/go.sum
+++ b/go.sum
@@ -4,8 +4,8 @@ github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj
 github.com/ebitengine/hideconsole v1.0.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
 github.com/ebitengine/purego v0.9.0 h1:mh0zpKBIXDceC63hpvPuGLiJ8ZAa3DfrFTudmfi8A4k=
 github.com/ebitengine/purego v0.9.0/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
-github.com/hajimehoshi/ebiten/v2 v2.9.7 h1:WuNgM24uJxwdLZLqM8SXLAGVBof/45udRjo2tJoTpM0=
-github.com/hajimehoshi/ebiten/v2 v2.9.7/go.mod h1:DAt4tnkYYpCvu3x9i1X/nK/vOruNXIlYq/tBXxnhrXM=
+github.com/hajimehoshi/ebiten/v2 v2.9.8 h1:xI0hIctuTMjFFk8lqEcUzoLjFy8d/FOBa9PDTWX+1rw=
+github.com/hajimehoshi/ebiten/v2 v2.9.8/go.mod h1:DAt4tnkYYpCvu3x9i1X/nK/vOruNXIlYq/tBXxnhrXM=
 github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
 github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
 golang.org/x/image v0.31.0 h1:mLChjE2MV6g1S7oqbXC0/UcKijjm5fnJLUYKIYrLESA=