diff --git a/mcpipy/mcpi/util.py b/mcpipy/mcpi/util.py
index 9b9386f..1c4dea0 100644
--- a/mcpipy/mcpi/util.py
+++ b/mcpipy/mcpi/util.py
@@ -9,7 +9,7 @@
 
 def flatten(l):
     for e in l:
-        if isinstance(e, collections.Iterable) and not isinstance(e, basestring):
+        if isinstance(e, collections.abc.Iterable) and not isinstance(e, basestring):
             for ee in flatten(e): yield ee
         else: yield e
 
diff --git a/mcpipy/mcpi/vec3.py b/mcpipy/mcpi/vec3.py
index 325ac49..46fac69 100644
--- a/mcpipy/mcpi/vec3.py
+++ b/mcpipy/mcpi/vec3.py
@@ -2,7 +2,7 @@
 
 class Vec3:
     def __init__(self, x=0, y=0, z=0):
-        if isinstance(x, collections.Iterable):
+        if isinstance(x, collections.abc.Iterable):
             self.x, self.y, self.z = tuple(x)
         else:
             self.x = x