diff --git a/Makefile b/Makefile
index 5f3e0fe..23c19bb 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@ pdf-thumbs:
 	  echo "pdf-thumbs: pdftoppm not found — install poppler (skipping)"; \
 	fi
 
-deploy: build sign
+deploy: clean build sign
 	git push -u origin main
 	rsync -avz --delete _site/ $(VPS_USER)@$(VPS_HOST):$(VPS_PATH)/
 
diff --git a/build/Contexts.hs b/build/Contexts.hs
index e51981b..937312c 100644
--- a/build/Contexts.hs
+++ b/build/Contexts.hs
@@ -139,7 +139,7 @@ abstractField = field "abstract" $ \item -> do
                     let doc' = case doc of
                                  Pandoc m [Para ils] -> Pandoc m [Plain ils]
                                  _                   -> doc
-                    let wOpts = defaultHakyllWriterOptions { writerHTMLMathMethod = KaTeX "" }
+                    let wOpts = defaultHakyllWriterOptions { writerHTMLMathMethod = MathML }
                     writeHtml5String wOpts doc'
             case pandocResult of
                 Left err -> fail $ "Pandoc error rendering abstract: " ++ show err
diff --git a/build/Tags.hs b/build/Tags.hs
index b6ad4fa..874a58d 100644
--- a/build/Tags.hs
+++ b/build/Tags.hs
@@ -66,7 +66,7 @@ buildAllTags :: Rules Tags
 buildAllTags =
     buildTagsWith getExpandedTags allContent tagIdentifier
   where
-    allContent = ("content/essays/*.md" .||. "content/blog/*.md") .&&. hasNoVersion
+    allContent = ("content/essays/*.md" .||. "content/essays/*/index.md" .||. "content/blog/*.md") .&&. hasNoVersion
 
 
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