diff --git a/rust-zopfli.spec b/rust-zopfli.spec
index 329e289..15d4730 100644
--- a/rust-zopfli.spec
+++ b/rust-zopfli.spec
@@ -15,6 +15,9 @@ Summary:        Rust implementation of the Zopfli compression algorithm
 License:        Apache-2.0
 URL:            https://crates.io/crates/zopfli
 Source:         %{crates_source}
+# Manually created patch for downstream crate metadata changes
+# * Allow proptest-derive 0.5.0
+Patch:          zopfli-fix-metadata.diff
 
 BuildRequires:  cargo-rpm-macros >= 26
 
diff --git a/rust2rpm.toml b/rust2rpm.toml
index 40f6dd4..3ca0ceb 100644
--- a/rust2rpm.toml
+++ b/rust2rpm.toml
@@ -2,6 +2,9 @@
 # Don’t build the “zopfli” executable, which would conflict with the more
 # widely used one provided by https://src.fedoraproject.org/rpms/zopfli.
 cargo-install-bin = false
+cargo-toml-patch-comments = [
+    "Allow proptest-derive 0.5.0",
+]
 
 [features]
 hide = [
diff --git a/zopfli-fix-metadata.diff b/zopfli-fix-metadata.diff
new file mode 100644
index 0000000..560b5fc
--- /dev/null
+++ b/zopfli-fix-metadata.diff
@@ -0,0 +1,11 @@
+--- zopfli-0.8.1/Cargo.toml	1970-01-01T00:00:01+00:00
++++ zopfli-0.8.1/Cargo.toml	2024-09-15T00:47:34.832733+00:00
+@@ -89,7 +89,7 @@
+ version = "1.4.0"
+ 
+ [dev-dependencies.proptest-derive]
+-version = "0.4.0"
++version = ">=0.4.0, <0.6.0"
+ 
+ [features]
+ default = [