diff --git a/__test__/draw.spec.ts b/__test__/draw.spec.ts
index a4f9adeb..0edd6219 100644
--- a/__test__/draw.spec.ts
+++ b/__test__/draw.spec.ts
@@ -488,7 +488,7 @@ test('fillText-AA', async (t) => {
 
 test('fillText-COLRv1', async (t) => {
   const { ctx, canvas } = t.context
-  GlobalFonts.registerFromPath(join(__dirname, 'fonts', 'COLRv1.ttf'), 'Colrv1')
+  GlobalFonts.registerFromPath(join(__dirname, 'fonts', 'COLR-v1.ttf'), 'Colrv1')
   ctx.font = '100px Colrv1'
   ctx.fillText('abc', 50, 100)
   await snapshotImage(t, { canvas, ctx }, 'png', 0.5)
diff --git a/__test__/fonts-dir/iosevka-curly-heavy.woff2 b/__test__/fonts-dir/iosevka-curly_heavy.Woff2
similarity index 100%
rename from __test__/fonts-dir/iosevka-curly-heavy.woff2
rename to __test__/fonts-dir/iosevka-curly_heavy.Woff2
diff --git a/__test__/fonts/COLRv1.ttf b/__test__/fonts/COLR-v1.ttf
similarity index 100%
rename from __test__/fonts/COLRv1.ttf
rename to __test__/fonts/COLR-v1.ttf
diff --git a/src/global_fonts.rs b/src/global_fonts.rs
index 51262ada..ee519d5c 100644
--- a/src/global_fonts.rs
+++ b/src/global_fonts.rs
@@ -44,6 +44,9 @@ pub mod GlobalFonts {
     Ok(font.register(font_data.as_ref(), maybe_name_alias))
   }
 
+  // TODO: Do file extensions in font_path need to be converted to lowercase?
+  // Windows and macOS are case-insensitive, Linux is not.
+  // See: https://github.com/Brooooooklyn/canvas/actions/runs/5893418006/job/15985737723
   #[napi]
   pub fn register_from_path(font_path: String, name_alias: Option<String>) -> Result<bool> {
     let maybe_name_alias = name_alias.and_then(|s| if s.is_empty() { None } else { Some(s) });
@@ -86,9 +89,13 @@ fn load_fonts_from_dir<P: AsRef<path::Path>>(dir: P) -> napi::Result<u32> {
           load_fonts_from_dir(f.path())?;
         } else {
           let p = f.path();
-          let ext = p.extension().and_then(|s| s.to_str());
+          // The font file extensions are case-insensitive.
+          let ext = p
+            .extension()
+            .and_then(|s| s.to_str())
+            .map(|s| s.to_ascii_lowercase());
 
-          match ext {
+          match ext.as_deref() {
             Some("ttf") | Some("ttc") | Some("otf") | Some("pfb") | Some("woff2")
             | Some("woff") => {
               if let Some(p) = p.into_os_string().to_str() {