diff --git a/15.0/base_requirements.txt b/15.0/base_requirements.txt
index 8cf629c3..1b087a4a 100644
--- a/15.0/base_requirements.txt
+++ b/15.0/base_requirements.txt
@@ -12,7 +12,7 @@ idna==3.8
 Jinja2==3.1.4 
 libsass==0.23.0
 lxml_html_clean==0.2.2
-lxml==5.3.0
+lxml==4.8.0
 Mako==1.3.5   # XXX no longer in the official requirements.txt
 MarkupSafe==2.1.5
 num2words==0.5.13
diff --git a/16.0/base_requirements.txt b/16.0/base_requirements.txt
index 8cf629c3..1b087a4a 100644
--- a/16.0/base_requirements.txt
+++ b/16.0/base_requirements.txt
@@ -12,7 +12,7 @@ idna==3.8
 Jinja2==3.1.4 
 libsass==0.23.0
 lxml_html_clean==0.2.2
-lxml==5.3.0
+lxml==4.8.0
 Mako==1.3.5   # XXX no longer in the official requirements.txt
 MarkupSafe==2.1.5
 num2words==0.5.13
diff --git a/17.0/base_requirements.txt b/17.0/base_requirements.txt
index a0030731..f84d0f66 100644
--- a/17.0/base_requirements.txt
+++ b/17.0/base_requirements.txt
@@ -13,7 +13,7 @@ idna==3.8
 Jinja2==3.1.4 
 libsass==0.23.0
 lxml_html_clean==0.2.2
-lxml==5.3.0 
+lxml==4.8.0
 Mako==1.3.5  # XXX no longer in the official requirements.txt 
 MarkupSafe==2.1.5
 num2words==0.5.13