diff --git a/environment_files/requirements_linux.txt b/environment_files/requirements_linux.txt
index fef76f7..e228fce 100644
--- a/environment_files/requirements_linux.txt
+++ b/environment_files/requirements_linux.txt
@@ -13,7 +13,7 @@ geographiclib==1.49
 h5py==2.9.0
 idna==2.8
 kiwisolver==1.1.0
-lxml==4.4.1
+lxml==4.6.2
 matplotlib==3.1.1
 numpy==1.17.0
 obspy==1.1.1
diff --git a/environment_files/requirements_osx.txt b/environment_files/requirements_osx.txt
index 95f800e..ac9d017 100644
--- a/environment_files/requirements_osx.txt
+++ b/environment_files/requirements_osx.txt
@@ -12,7 +12,7 @@ geographiclib==1.49
 h5py==2.9.0
 idna==2.8
 kiwisolver==1.1.0
-lxml==4.4.1
+lxml==4.6.2
 matplotlib==3.1.1
 numpy==1.17.1
 obspy==1.1.0