diff --git a/go.mod b/go.mod
index e2ce62f..0486e8e 100644
--- a/go.mod
+++ b/go.mod
@@ -4,14 +4,11 @@ go 1.23.2
 
 require github.com/hajimehoshi/ebiten/v2 v2.8.0
 
-require github.com/setanarut/vec v1.1.1 // indirect
-
 require (
 	github.com/ebitengine/gomobile v0.0.0-20240911145611-4856209ac325 // indirect
 	github.com/ebitengine/hideconsole v1.0.0 // indirect
 	github.com/ebitengine/purego v0.8.0 // indirect
 	github.com/jezek/xgb v1.1.1 // indirect
-	github.com/setanarut/cm v1.13.0
 	github.com/setanarut/fastnoise v1.1.1
 	golang.org/x/sync v0.8.0 // indirect
 	golang.org/x/sys v0.25.0 // indirect
diff --git a/go.sum b/go.sum
index b45cfd6..6800221 100644
--- a/go.sum
+++ b/go.sum
@@ -8,14 +8,8 @@ github.com/hajimehoshi/ebiten/v2 v2.8.0 h1:CZF2PAksTG7vee9mu1Ok9QHqPyic0rTmIQvep
 github.com/hajimehoshi/ebiten/v2 v2.8.0/go.mod h1:32c6GXjzxA/h2CLLNMjWv5dVSNkTnn7NASZm0nXC/rA=
 github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
 github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
-github.com/ojrac/opensimplex-go v1.0.2 h1:l4vs0D+JCakcu5OV0kJ99oEaWJfggSc9jiLpxaWvSzs=
-github.com/ojrac/opensimplex-go v1.0.2/go.mod h1:NwbXFFbXcdGgIFdiA7/REME+7n/lOf1TuEbLiZYOWnM=
-github.com/setanarut/cm v1.13.0 h1:Q2nWHt6+qDSITYBmfPOJZcrQO7O7eUPLgz7UjBkPNvQ=
-github.com/setanarut/cm v1.13.0/go.mod h1:XHZUdrVAuqVbrvJETGKb+0yFtyirJwiM2A4jMSw8+Pk=
 github.com/setanarut/fastnoise v1.1.1 h1:cD9gUjY9GMxVab+B7AY09j2GAHMdiKzchDE5z6dQ7eE=
 github.com/setanarut/fastnoise v1.1.1/go.mod h1:74vG3/RcPPcNi2M0riHJXQp9/+eTSh0rnQ/0WTEY6SU=
-github.com/setanarut/vec v1.1.1 h1:2nH1gbDMCa/IHTdG41nmI+2OYyKhbiputK+Bg/mMK+s=
-github.com/setanarut/vec v1.1.1/go.mod h1:ZDoKd7F60rWLgCK58novWOCe5ePiXfSkwtmuOSSC9TU=
 golang.org/x/image v0.20.0 h1:7cVCUjQwfL18gyBJOmYvptfSHS8Fb3YUDtfLIZ7Nbpw=
 golang.org/x/image v0.20.0/go.mod h1:0a88To4CYVBAHp5FXJm8o7QbUl37Vd85ply1vyD8auM=
 golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=