diff --git a/blog-meta/blog-meta.cabal b/blog-meta/blog-meta.cabal
index 01655b1..210554e 100644
--- a/blog-meta/blog-meta.cabal
+++ b/blog-meta/blog-meta.cabal
@@ -14,13 +14,13 @@ common deps
     NondecreasingIndentation,
     ViewPatterns
   build-depends:
-    base >= 4.14.2.0 && < 4.17,
+    base >= 4.14.2.0 && < 4.18,
     HsYAML ^>= 0.2.1.0,
-    bytestring ^>= 0.10.12.0,
+    bytestring ^>= 0.11.4.0,
     containers ^>= 0.6.4.1,
     filemanip,
     filepath ^>= 1.4.2.1,
-    pandoc-types ^>= 1.22,
+    pandoc-types ^>= 1.23,
     text ^>= 1.2.4.1,
     time ^>= 1.9.3
   ghc-options: -Wall
diff --git a/blog-meta/lib/Misc.hs b/blog-meta/lib/Misc.hs
index 026d8bf..1b7d694 100644
--- a/blog-meta/lib/Misc.hs
+++ b/blog-meta/lib/Misc.hs
@@ -52,6 +52,5 @@ inlineText _                 = Nothing
 blockText :: Block -> Maybe Text
 blockText (Plain is)       = foldMap inlineText is
 blockText (Para  is)       = foldMap inlineText is
-blockText Null             = Just ""
 blockText (RawBlock _ txt) = Just txt
 blockText _                = Nothing
diff --git a/cabal.project b/cabal.project
index 1be2f1a..13af715 100644
--- a/cabal.project
+++ b/cabal.project
@@ -11,3 +11,9 @@ source-repository-package
   type: git
   location: https://git.rhiannon.website/rhi/svg-builder
   tag: 1cbcd594d3009f9fd71f253b52ac82673bf5482e
+
+allow-newer:
+  svg-builder:base,
+  svg-builder:bytestring
+
+constraints: pandoc-types == 1.23
diff --git a/lang b/lang
index d23e043..f6d1067 160000
--- a/lang
+++ b/lang
@@ -1 +1 @@
-Subproject commit d23e0435aae964c4ed9dd74a7c15f3e6c8e1f254
+Subproject commit f6d10672d2c621a9b812142289124e72b869d265