diff --git a/package.json b/package.json
index 7da7eba..aad659b 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "dependencies": {
     "patel": ">=0.30.0",
     "node-sfnt": ">=0.0.20",
-    "bezier-js": "*",
+    "bezier-js": "^2.0.0",
     "yargs": "*",
     "libspiro-js": ">=0.3.0",
     "toml": ">=2.3.0",
diff --git a/support/glyph.ptl b/support/glyph.ptl
index c120c70..41225e0 100644
--- a/support/glyph.ptl
+++ b/support/glyph.ptl
@@ -190,7 +190,7 @@ export all : class Glyph
 					local p2 ocontour.(j + 1)
 					local p3 ocontour.(j + 2)
 					local strand : new Bezier p0.x p0.y p1.x p1.y p2.x p2.y p3.x p3.y
-					local ts [strand.inflections].y
+					local ts [strand.extremas].y
 					piecewise
 						(!ts || ts.length < 1) : contour.push p1 p2 p3
 						true : begin
@@ -210,7 +210,7 @@ export all : class Glyph
 					local p2 ocontour.(j + 1)
 					if [not p2.onCurve] : set p2 : new Point [mix p1.x p2.x 0.5] [mix p1.y p2.y 0.5] true
 					local strand : new Bezier p0.x p0.y p1.x p1.y p2.x p2.y
-					local ts [strand.inflections].y
+					local ts [strand.extremas].y
 					piecewise
 						(!ts || ts.length < 1) : contour.push p1 p2
 						true : begin