diff --git a/setup.cfg b/setup.cfg
index c858ffa9..958a2be1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,7 +29,7 @@ install_requires =
   dask[array]>=2
   globus-sdk>=3.0
   gwcs>=0.18.0
-  matplotlib>=3.1
+  matplotlib>=3.4
   ndcube[plotting,reproject]>=2.0
   numpy>=1.21
   parfive[ftp]>=1.3
diff --git a/tox.ini b/tox.ini
index 42daf453..f093024b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,7 +40,7 @@ deps =
     oldestdeps: dask[array]<2.1
     oldestdeps: globus-sdk<3.1
     oldestdeps: gwcs<0.19
-    oldestdeps: matplotlib<3.3
+    oldestdeps: matplotlib<3.5
     oldestdeps: ndcube<2.1
     oldestdeps: numpy<1.22
     oldestdeps: parfive[ftp]<1.3