diff --git a/requirements-as-package.txt b/requirements-as-package.txt
index d84205f..3e68990 100644
--- a/requirements-as-package.txt
+++ b/requirements-as-package.txt
@@ -40,7 +40,7 @@ uncertainties>=3.1.2
 xlrd==1.1.0
 openpyxl==3.0.7
 xlsxwriter==1.0.4
-lxml==4.6.2
+lxml==4.9.1
 jsonpickle==1.2
 python_magic>=0.4.13  # To be removed, it is used only by the Magic Box file type detection
 dotted>=0.1.8 # <- Dotted notation: !!Fantastic!!
diff --git a/requirements.txt b/requirements.txt
index 788ed8d..9dd6f0a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -58,7 +58,7 @@ xlrd==1.1.0
 openpyxl==2.4.8
 xlsxwriter==1.0.4
 #koala2==0.0.17
-lxml==4.6.2
+lxml==4.9.1
 #jsonpickle==0.9.6
 jsonpickle==1.2
 python_magic>=0.4.13  # To be removed, it is used only by the Magic Box file type detection