diff --git a/zorg/buildbot/builders/SphinxDocsBuilder.py b/zorg/buildbot/builders/SphinxDocsBuilder.py
index 30c87434..9bc4f3e5 100644
--- a/zorg/buildbot/builders/SphinxDocsBuilder.py
+++ b/zorg/buildbot/builders/SphinxDocsBuilder.py
@@ -176,6 +176,12 @@ def getSphinxRuntimesDocsBuildFactory(
             src_to_build_dir='runtimes',
             **kwargs) # Pass through all the extra arguments.
 
+    f.addStep(ShellCommand(
+                name="Install pip depenencies",
+                command=['pip install -r llvm-project/llvm/docs/requirements.txt'],
+                workdir=f.obj_dir,
+    ))
+
     UnifiedTreeBuilder.addCmakeSteps(
         f,
         cleanBuildRequested=f.cleanBuildRequested,