diff --git a/asciidoctor-spec.Dockerfile b/asciidoctor-spec.Dockerfile
index daa1e7f..fe395b3 100644
--- a/asciidoctor-spec.Dockerfile
+++ b/asciidoctor-spec.Dockerfile
@@ -81,7 +81,7 @@ env PATH="$VIRTUAL_ENV/bin:$PATH"
 run pip3 install \
     wheel setuptools \
     codespell lxml meson networkx pygments pyparsing pytest termcolor \
-    reuse utidylib
+    reuse utidylib requests beautifulsoup4
 
 # JavaScript packages
 # escape-string-regexp is locked @2.0.0 because the current version is an