diff --git a/conda-requirements.txt b/conda-requirements.txt
index 48e3643ea9..f533a424dc 100644
--- a/conda-requirements.txt
+++ b/conda-requirements.txt
@@ -4,7 +4,7 @@
 # Mandatory dependencies
 biggus>=0.14.0
 cartopy
-matplotlib=1.3.1
+matplotlib
 netcdf4
 numpy
 pyke
diff --git a/minimal-conda-requirements.txt b/minimal-conda-requirements.txt
index 46e9c49ba9..5aef25c0f8 100644
--- a/minimal-conda-requirements.txt
+++ b/minimal-conda-requirements.txt
@@ -4,7 +4,7 @@
 # Mandatory dependencies
 biggus>=0.14.0
 cartopy
-matplotlib=1.3.1
+matplotlib
 netcdf4
 numpy
 pyke