diff --git a/.gitignore b/.gitignore
index f237789..fc79ea3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 /libdeflater-1.19.0.crate
 /libdeflater-1.19.2.crate
 /libdeflater-1.19.3.crate
+/libdeflater-1.20.0.crate
diff --git a/libdeflater-fix-metadata.diff b/libdeflater-fix-metadata.diff
deleted file mode 100644
index 06df28e..0000000
--- a/libdeflater-fix-metadata.diff
+++ /dev/null
@@ -1,20 +0,0 @@
---- libdeflater-1.19.3/Cargo.toml	1970-01-01T00:00:01+00:00
-+++ libdeflater-1.19.3/Cargo.toml	2024-03-11T14:44:03.719963+00:00
-@@ -32,6 +32,7 @@
- ]
- license = "Apache-2.0"
- repository = "https://github.com/adamkewley/libdeflater"
-+exclude = ["/scripts"]
- 
- [[bench]]
- name = "benchmarks"
-@@ -43,9 +44,6 @@
- [dev-dependencies.adler32]
- version = "1.2.0"
- 
--[dev-dependencies.criterion]
--version = "0.3"
--
- [dev-dependencies.flate2]
- version = "1.0.11"
- 
diff --git a/rust-libdeflater.spec b/rust-libdeflater.spec
index 7112d64..c5f7068 100644
--- a/rust-libdeflater.spec
+++ b/rust-libdeflater.spec
@@ -5,20 +5,19 @@
 %global crate libdeflater
 
 Name:           rust-libdeflater
-Version:        1.19.3
+Version:        1.20.0
 Release:        %autorelease
 Summary:        Bindings to libdeflate for DEFLATE
 
 License:        Apache-2.0
 URL:            https://crates.io/crates/libdeflater
 Source:         %{crates_source}
-# Manually created patch for downstream crate metadata changes
-# * Do not depend on criterion; it is needed only for benchmarks.
-# * Exclude the scripts directory to avoid generating an unwanted and
-#   unnecessary dependency on ruby from the -devel subpackage
-Patch:          libdeflater-fix-metadata.diff
 
 BuildRequires:  cargo-rpm-macros >= 24
+# Do downstream crate metadata changes programmatically in %%prep. Since %%prep
+# runs before %%generate_buildrequires, we must add the following manually
+# rather than generating a dynamic BuildRequires via rust2rpm.toml.
+BuildRequires:  tomcli
 
 %global _description %{expand:
 Bindings to libdeflate for DEFLATE (de)compression exposed as non-
@@ -93,6 +92,8 @@ use the "use_rust_alloc" feature of the "%{crate}" crate.
 %prep
 %autosetup -n %{crate}-%{version} -p1
 %cargo_prep
+# Do not depend on criterion; it is needed only for benchmarks.
+tomcli set Cargo.toml del dev-dependencies.criterion
 
 %generate_buildrequires
 %cargo_generate_buildrequires
diff --git a/rust2rpm.toml b/rust2rpm.toml
index 1781693..5eee6c1 100644
--- a/rust2rpm.toml
+++ b/rust2rpm.toml
@@ -1,5 +1,5 @@
-[package]
-cargo-toml-patch-comments = [
-    "Do not depend on criterion; it is needed only for benchmarks.",
-    "Exclude the scripts directory to avoid generating an unwanted and unnecessary dependency on ruby from the -devel subpackage",
+[scripts.prep]
+post = [
+    "# Do not depend on criterion; it is needed only for benchmarks.",
+    "tomcli set Cargo.toml del dev-dependencies.criterion",
 ]
diff --git a/sources b/sources
index 047a1b4..445d687 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (libdeflater-1.19.3.crate) = b6bd4c8cb7d56771f92fd1491fec2a8a7cb1493b3e86866bd5e029c9b8a55fbc343433a5ae6f575adbb0774767aa7224e714d3db27b14557683e2ffb97e2a4c6
+SHA512 (libdeflater-1.20.0.crate) = 763ae07856284a8353a441bd335bcb0ec55200c03a5924aa7d25b083fa05a7d887d747688d6e0e01ca8fd90480fcb3463c55b94a274f257bace11da792cf87af