diff --git a/go.mod b/go.mod
index 5b02eaf..a9e753f 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,7 @@ go 1.27.1
 
 require (
 	github.com/go-opentype/fonts v0.14.0
-	github.com/go-opentype/opentype v0.18.0
+	github.com/go-opentype/opentype v0.21.1
 	github.com/go-pdfkit/pdffont v0.4.0
 	github.com/go-pdfkit/reader v0.10.0
 )
diff --git a/go.sum b/go.sum
index 25a8e78..5d7bead 100644
--- a/go.sum
+++ b/go.sum
@@ -5,8 +5,8 @@ github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707/go.mod h1:qssHWj6
 github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
 github.com/go-opentype/fonts v0.14.0 h1:WHw7k9gkHT1pu9B2yyvd0FWyQqn/4NKFQoKhvMYt3Mo=
 github.com/go-opentype/fonts v0.14.0/go.mod h1:od2QcmdpKo7QCqo6Jb16y4GULk+h2Hhfq6x3xfvn62Q=
-github.com/go-opentype/opentype v0.18.0 h1:kxYj8r6on63QwPML6Y41xGrSH7A9ap9tKWioI4yFs9Y=
-github.com/go-opentype/opentype v0.18.0/go.mod h1:cyTZyPcwVFR4MTHnCj7a6tk2tGIB6deakpefu/apDjg=
+github.com/go-opentype/opentype v0.21.1 h1:axfaZjo6acnY9OcFHC/q5gaSqyc/KjuaNJ6Z7UBOJPI=
+github.com/go-opentype/opentype v0.21.1/go.mod h1:cyTZyPcwVFR4MTHnCj7a6tk2tGIB6deakpefu/apDjg=
 github.com/go-pdfkit/pdffont v0.4.0 h1:3CV2HnmUGHiIYuZ5dJWRLKvi7hMHGWS1RjgNYkEZ0Gk=
 github.com/go-pdfkit/pdffont v0.4.0/go.mod h1:l7es3IPbKewQF+sSgPh/bQL18jSewoI0cMjttk7uPlc=
 github.com/go-pdfkit/reader v0.10.0 h1:Wi0GCUADMZFxL9iuVwxuiDhv10nGxbZZjNKJIqtj63E=