diff --git a/binder/requirements.txt b/binder/requirements.txt
index 047b8618..df1d3b7c 100644
--- a/binder/requirements.txt
+++ b/binder/requirements.txt
@@ -56,7 +56,7 @@ nbformat==5.1.2; python_full_version >= "3.6.1" and python_version >= "3.6"
 nbsphinx==0.7.1; python_version >= "3"
 nest-asyncio==1.5.1; python_full_version >= "3.6.1" and python_version >= "3.6"
 netcdf4==1.5.6; python_version >= "3.7"
-numpy==1.18.5; python_version >= "3.5"
+numpy==1.21.0; python_version >= "3.5"
 opt-einsum==3.3.0; python_version >= "3.5"
 oset==0.1.3
 packaging==20.9; python_version >= "3.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.7"