diff --git a/requirements/requirements-docs.txt b/requirements/requirements-docs.txt
index 2de120c1f3..4e0fc592ae 100644
--- a/requirements/requirements-docs.txt
+++ b/requirements/requirements-docs.txt
@@ -15,4 +15,4 @@ click
 orjson
 black
 holidays~=0.9
-matplotlib
+matplotlib~=3.6
diff --git a/requirements/requirements-test.txt b/requirements/requirements-test.txt
index e520671b01..88205bcaf8 100644
--- a/requirements/requirements-test.txt
+++ b/requirements/requirements-test.txt
@@ -8,4 +8,4 @@ ujson
 orjson
 requests
 holidays~=0.9
-matplotlib
+matplotlib~=3.6
diff --git a/src/gluonts/model/forecast.py b/src/gluonts/model/forecast.py
index 0652c315a7..f41d001212 100644
--- a/src/gluonts/model/forecast.py
+++ b/src/gluonts/model/forecast.py
@@ -316,7 +316,7 @@ def plot(
         # If no color is provided, we use matplotlib's internal color cycle.
         # Note: This is an internal API and might change in the future.
         color = maybe.unwrap_or_else(
-            color, lambda: next(ax._get_lines.prop_cycler)["color"]
+            color, lambda: ax._get_lines.get_next_color()
         )
 
         # Plot median forecast