diff --git a/docs/book/book.toml b/docs/book/book.toml
index 8c81c09..f087e48 100644
--- a/docs/book/book.toml
+++ b/docs/book/book.toml
@@ -31,4 +31,4 @@ use-boolean-and = true
 enable = true
 
 [rust]
-edition = "2024"
+edition = "2021"
diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
index b8479fb..e068d97 100644
--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -66,7 +66,7 @@ dependencies = [
 
 [[package]]
 name = "heuropt"
-version = "0.3.0"
+version = "0.8.0"
 dependencies = [
  "rand",
  "rand_distr",
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index baf728c..34c6227 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -1,3 +1,7 @@
+[workspace]
+# Detach from the parent heuropt workspace so cargo-fuzz can build
+# this crate independently without listing it as a workspace member.
+
 [package]
 name = "heuropt-fuzz"
 version = "0.0.0"