diff --git a/agatecharts/charts/bars.py b/agatecharts/charts/bars.py
index b5a0e0b..fec1a7f 100644
--- a/agatecharts/charts/bars.py
+++ b/agatecharts/charts/bars.py
@@ -58,7 +58,7 @@ def plot(self, table, axes):
                 series_positions,
                 value_column,
                 bar_height,
-                color=colors.next(),
+                color=next(colors),
                 linewidth=0,
                 label=value_column_name
             )
diff --git a/agatecharts/charts/columns.py b/agatecharts/charts/columns.py
index acb40d8..7d07962 100644
--- a/agatecharts/charts/columns.py
+++ b/agatecharts/charts/columns.py
@@ -54,7 +54,7 @@ def plot(self, table, axes):
                 series_positions,
                 value_column,
                 bar_width,
-                color=colors.next(),
+                color=next(colors),
                 linewidth=0,
                 label=value_column_name
             )
diff --git a/agatecharts/charts/lines.py b/agatecharts/charts/lines.py
index 7372861..3fdbf51 100644
--- a/agatecharts/charts/lines.py
+++ b/agatecharts/charts/lines.py
@@ -52,7 +52,7 @@ def plot(self, table, axes):
                 x_column,
                 y_column,
                 linewidth=2,
-                color=colors.next(),
+                color=next(colors),
                 label=y_column_name
             )