diff --git a/Build.PL b/Build.PL
index 1218f368..de100cfa 100644
--- a/Build.PL
+++ b/Build.PL
@@ -10,7 +10,7 @@ my $build = Module::Build->new(
         'Boost::Geometry::Utils'    => '0',
         'File::Basename'            => '0',
         'Getopt::Long'              => '0',
-        'Math::Clipper'             => '1.07',
+        'Math::Clipper'             => '1.09',
         'Math::ConvexHull'          => '1.0.4',
         'Math::Geometry::Voronoi'   => '1.3',
         'Math::PlanePath'           => '53',
diff --git a/lib/Slic3r/Geometry/Clipper.pm b/lib/Slic3r/Geometry/Clipper.pm
index 3445edcb..1adc3334 100644
--- a/lib/Slic3r/Geometry/Clipper.pm
+++ b/lib/Slic3r/Geometry/Clipper.pm
@@ -8,7 +8,7 @@ our @EXPORT_OK = qw(explode_expolygon explode_expolygons safety_offset offset
     diff_ex diff union_ex intersection_ex xor_ex PFT_EVENODD JT_MITER JT_ROUND
     is_counter_clockwise);
 
-use Math::Clipper 1.07 ':all';
+use Math::Clipper 1.09 ':all';
 use Slic3r::Geometry qw(scale);
 our $clipper = Math::Clipper->new;