diff --git a/requirements.txt b/requirements.txt
index 5ea5e9a..4401b8e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 Cython==0.29.13
 tabulate==0.8.7
-lxml==4.4.0
+lxml==5.2.2
 mpmath==1.1.0
 numpy==1.17.3
 matplotlib==3.0.2
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 5ea5e9a..4401b8e 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -1,6 +1,6 @@
 Cython==0.29.13
 tabulate==0.8.7
-lxml==4.4.0
+lxml==5.2.2
 mpmath==1.1.0
 numpy==1.17.3
 matplotlib==3.0.2
diff --git a/requirements/prod.txt b/requirements/prod.txt
index 5ea5e9a..4401b8e 100644
--- a/requirements/prod.txt
+++ b/requirements/prod.txt
@@ -1,6 +1,6 @@
 Cython==0.29.13
 tabulate==0.8.7
-lxml==4.4.0
+lxml==5.2.2
 mpmath==1.1.0
 numpy==1.17.3
 matplotlib==3.0.2
diff --git a/requirements/test.txt b/requirements/test.txt
index 5ea5e9a..4401b8e 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -1,6 +1,6 @@
 Cython==0.29.13
 tabulate==0.8.7
-lxml==4.4.0
+lxml==5.2.2
 mpmath==1.1.0
 numpy==1.17.3
 matplotlib==3.0.2