diff --git a/FlowCytometryTools/core/containers.py b/FlowCytometryTools/core/containers.py
index c33c437..fe4bdc2 100644
--- a/FlowCytometryTools/core/containers.py
+++ b/FlowCytometryTools/core/containers.py
@@ -1,4 +1,4 @@
-import collections
+import collections.abc
 import inspect
 import warnings
 from itertools import cycle
@@ -135,7 +135,7 @@ def plot(
             if gate_colors is None:
                 gate_colors = cycle(("b", "g", "r", "m", "c", "y"))
 
-            if not isinstance(gate_lw, collections.Iterable):
+            if not isinstance(gate_lw, collections.abc.Iterable):
                 gate_lw = [gate_lw]
 
             gate_lw = cycle(gate_lw)