diff --git a/doc/requirements.txt b/doc/requirements.txt
index cf578035..ba571ff8 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
 click==8.0.1
 entrypoints==0.3
-Pillow==8.3.0
+Pillow==8.3.1
 Sphinx==4.0.3
 sphinx-rtd-theme==0.5.2
diff --git a/requirements.txt b/requirements.txt
index 8ae51a46..559c6f9e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,6 @@ numpy==1.21.0
 scipy==1.7.0
 h5netcdf==0.11.0
 h5py==3.3.0
-pillow==8.3.0
+pillow==8.3.1
 loguru==0.5.3
 tqdm==4.61.2