diff --git a/requirement_files/development.txt b/requirement_files/development.txt
index e7a5f5dc..564b2ee1 100644
--- a/requirement_files/development.txt
+++ b/requirement_files/development.txt
@@ -61,7 +61,7 @@ itypes==1.1.0
 jdcal==1.4.1
 Jinja2==2.10.1
 lml==0.0.9
-lxml==4.5.2
+lxml==4.9.1
 MarkupSafe==0.23
 msgpack-python==0.4.8
 mutagen==1.44.0
diff --git a/requirement_files/requirements.txt b/requirement_files/requirements.txt
old mode 100755
new mode 100644
index 30bf4a17..889c9a12
--- a/requirement_files/requirements.txt
+++ b/requirement_files/requirements.txt
@@ -52,7 +52,7 @@ incremental==17.5.0
 itypes==1.1.0
 jdcal==1.4.1
 Jinja2==2.10.1
-lxml==4.5.2
+lxml==4.9.1
 MarkupSafe==0.23
 msgpack-python==0.4.8
 numpy==1.19.1