diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -5,6 +5,11 @@
 ## Unreleased changes
 
 
+## Version 0.8.0.0
+
+-   Adapt to breaking changes in upstream libraries (`data-default`).
+
+
 ## Version 0.7.2.0
 
 -   `slynx`: Allow global normalization of mixture models.
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 # The ELynx Suite
 
-Version: 0.7.2.1.
+Version: 0.8.0.0.
 Reproducible evolution made easy.
 
 <p align="center"><img src="https://travis-ci.org/dschrempf/elynx.svg?branch=master"/></p>
@@ -73,9 +73,9 @@
     # OR: stack exec slynx -- --help
     # OR: slynx --help
 
-    ELynx Suite version 0.7.2.1.
+    ELynx Suite version 0.8.0.0.
     Developed by Dominik Schrempf.
-    Compiled on June 15, 2023, at 19:54 pm, UTC.
+    Compiled on October 27, 2024, at 07:14 am, UTC.
     
     Usage: slynx [-v|--verbosity VALUE] [-o|--output-file-basename NAME]
                  [-f|--force] [--no-elynx-file] COMMAND
@@ -143,9 +143,9 @@
     # OR: stack exec slynx -- simulate --help
     # OR: slynx simulate --help
 
-    ELynx Suite version 0.7.2.1.
+    ELynx Suite version 0.8.0.0.
     Developed by Dominik Schrempf.
-    Compiled on June 15, 2023, at 19:54 pm, UTC.
+    Compiled on October 27, 2024, at 07:14 am, UTC.
     
     Usage: slynx simulate (-t|--tree-file Name) [-s|--substitution-model MODEL]
                           [-m|--mixture-model MODEL] [-n|--global-normalization]
diff --git a/slynx.cabal b/slynx.cabal
--- a/slynx.cabal
+++ b/slynx.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               slynx
-version:            0.7.2.2
+version:            0.8.0.0
 synopsis:           Handle molecular sequences
 description:
   Examine, modify, and simulate molecular sequences in a reproducible way. Please see the README on GitHub at <https://github.com/dschrempf/elynx>.
diff --git a/src/SLynx/Simulate/Simulate.hs b/src/SLynx/Simulate/Simulate.hs
--- a/src/SLynx/Simulate/Simulate.hs
+++ b/src/SLynx/Simulate/Simulate.hs
@@ -159,7 +159,7 @@
     v = BL.pack val
 
 -- | Examine branches of a tree.
-summarizeLengths :: HasLength e => Tree e a -> BL.ByteString
+summarizeLengths :: (HasLength e) => Tree e a -> BL.ByteString
 summarizeLengths t =
   BL.intercalate
     "\n"