diff --git a/crayfish/gui/plot_1d_widget.py b/crayfish/gui/plot_1d_widget.py
index e67f84e2..d78df9ac 100644
--- a/crayfish/gui/plot_1d_widget.py
+++ b/crayfish/gui/plot_1d_widget.py
@@ -40,7 +40,7 @@
     import sys
     import os
     this_dir = os.path.dirname(os.path.realpath(__file__))
-    path = os.path.join(this_dir, os.pardir, 'pyqtgraph-0.10.0-py2.py3-none-any.whl')
+    path = os.path.join(this_dir, os.pardir, 'pyqtgraph-0.11.1-py2.py3-none-any.whl')
     sys.path.append(path)
     import pyqtgraph
 
diff --git a/crayfish/gui/plot_3d_widget.py b/crayfish/gui/plot_3d_widget.py
index b092e320..d9c2db5f 100644
--- a/crayfish/gui/plot_3d_widget.py
+++ b/crayfish/gui/plot_3d_widget.py
@@ -41,7 +41,7 @@
     import sys
     import os
     this_dir = os.path.dirname(os.path.realpath(__file__))
-    path = os.path.join(this_dir, os.pardir, 'pyqtgraph-0.10.0-py2.py3-none-any.whl')
+    path = os.path.join(this_dir, os.pardir, 'pyqtgraph-0.11.1-py2.py3-none-any.whl')
     sys.path.append(path)
     import pyqtgraph
 
diff --git a/crayfish/gui/plot_widget.py b/crayfish/gui/plot_widget.py
index 03b63988..faa82f2e 100644
--- a/crayfish/gui/plot_widget.py
+++ b/crayfish/gui/plot_widget.py
@@ -40,7 +40,7 @@
     import sys
     import os
     this_dir = os.path.dirname(os.path.realpath(__file__))
-    path = os.path.join(this_dir, os.pardir, 'pyqtgraph-0.10.0-py2.py3-none-any.whl')
+    path = os.path.join(this_dir, os.pardir, 'pyqtgraph-0.11.1-py2.py3-none-any.whl')
     sys.path.append(path)
     import pyqtgraph
 
diff --git a/crayfish/metadata.txt b/crayfish/metadata.txt
index 9085a706..a5c07f72 100644
--- a/crayfish/metadata.txt
+++ b/crayfish/metadata.txt
@@ -1,17 +1,20 @@
 ; the next section is mandatory
 [general]
 name=Crayfish
-qgisMinimumVersion=3.17
+qgisMinimumVersion=3.18
 qgisMaximumVersion=3.99
 description=Tools for mesh layers QGIS
-version=3.5.0
+version=3.5.1
 author=Lutra Consulting
 email=info@lutraconsulting.co.uk
 about=The Crayfish plugin contains set of advanced tool for the QGIS Mesh Layer as plots and animations.
 ; end of mandatory metadata
 
 ; start of optional metadata
-changelog=3.5.0 Bug Fixes and New Features:
+changelog=3.5.1 Bug Fixes:
+ - Support for Python 3.9.x
+ - Usage of pyqtgraph 0.11.1
+ <p>3.5.0 Bug Fixes and New Features:
  - Fix invalid ffmpeg download url
  - Fix SAGA processing algorithms
  - Moved the processing algorithms to QGIS main repository
diff --git a/crayfish/plot.py b/crayfish/plot.py
index d7f0c131..550d5fb0 100644
--- a/crayfish/plot.py
+++ b/crayfish/plot.py
@@ -39,7 +39,7 @@
     import sys
     import os
     this_dir = os.path.dirname(os.path.realpath(__file__))
-    path = os.path.join(this_dir, 'pyqtgraph-0.10.0-py2.py3-none-any.whl')
+    path = os.path.join(this_dir, 'pyqtgraph-0.11.1-py2.py3-none-any.whl')
     sys.path.append(path)
     import pyqtgraph as pg
     from pyqtgraph.exporters import ImageExporter
diff --git a/crayfish/pyqtgraph-0.10.0-py2.py3-none-any.whl b/crayfish/pyqtgraph-0.10.0-py2.py3-none-any.whl
deleted file mode 100644
index 424dd729..00000000
Binary files a/crayfish/pyqtgraph-0.10.0-py2.py3-none-any.whl and /dev/null differ
diff --git a/crayfish/pyqtgraph-0.11.1-py2.py3-none-any.whl b/crayfish/pyqtgraph-0.11.1-py2.py3-none-any.whl
new file mode 100644
index 00000000..e9259427
Binary files /dev/null and b/crayfish/pyqtgraph-0.11.1-py2.py3-none-any.whl differ