diff --git a/.gitignore b/.gitignore
index 5ddbc1c..c80f712 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /zlib-rs-0.3.1.crate
+/zlib-rs-0.4.0.crate
diff --git a/rust-zlib-rs.spec b/rust-zlib-rs.spec
index 3303cd0..e4fae27 100644
--- a/rust-zlib-rs.spec
+++ b/rust-zlib-rs.spec
@@ -5,7 +5,7 @@
 %global crate zlib-rs
 
 Name:           rust-zlib-rs
-Version:        0.3.1
+Version:        0.4.0
 Release:        %autorelease
 Summary:        Memory-safe zlib implementation written in rust
 
diff --git a/rust2rpm.toml b/rust2rpm.toml
new file mode 100644
index 0000000..760b504
--- /dev/null
+++ b/rust2rpm.toml
@@ -0,0 +1,5 @@
+[package]
+cargo-toml-patch-comments = [
+    "drop dependencies and internal-only features for fuzz-testing",
+]
+
diff --git a/sources b/sources
index dec870a..53db215 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (zlib-rs-0.3.1.crate) = 83b68185ade43ab27ff9a213a89c6ed23c9044b90402494251b4026ce7647128fac90321103e20069ebdd4a6e08b828c1aa66352e19d2056ec80edfe3d46e4c2
+SHA512 (zlib-rs-0.4.0.crate) = f068ecb90393c470c39c733bc6e9ffe683b3b66027c90f03f72542b5497edc6c134bc48573483bef69f35ce20f6a4af7c8f7b205fe1f3faeccebb76873780321
diff --git a/zlib-rs-fix-metadata.diff b/zlib-rs-fix-metadata.diff
index 49a5743..be1e1fa 100644
--- a/zlib-rs-fix-metadata.diff
+++ b/zlib-rs-fix-metadata.diff
@@ -1,6 +1,6 @@
---- zlib-rs-0.3.1/Cargo.toml	1970-01-01T00:00:01+00:00
-+++ zlib-rs-0.3.1/Cargo.toml	2024-10-19T09:51:09.355690+00:00
-@@ -30,23 +30,6 @@
+--- zlib-rs-0.4.0/Cargo.toml	1970-01-01T00:00:01+00:00
++++ zlib-rs-0.4.0/Cargo.toml	2024-11-20T05:03:47.033928+00:00
+@@ -30,17 +30,6 @@
  name = "zlib_rs"
  path = "src/lib.rs"
  
@@ -9,12 +9,6 @@
 -features = ["derive"]
 -optional = true
 -
--[dependencies.libz-sys]
--version = "1.1.19"
--features = ["zlib-ng"]
--optional = true
--default-features = false
--
 -[dependencies.quickcheck]
 -version = "1.0.3"
 -features = []
@@ -24,12 +18,13 @@
  [dev-dependencies.crc32fast]
  version = "1.3.2"
  
-@@ -56,9 +39,6 @@
+@@ -50,10 +39,6 @@
  default-features = false
  
  [features]
 -ZLIB_DEBUG = []
 -__internal-fuzz = ["arbitrary"]
+-__internal-fuzz-disable-checksum = []
 -__internal-test = ["quickcheck"]
  c-allocator = []
  default = [