diff --git a/rust-rand_core.spec b/rust-rand_core.spec
index e161a81..f6bbe7a 100644
--- a/rust-rand_core.spec
+++ b/rust-rand_core.spec
@@ -7,19 +7,17 @@
 
 Name:           rust-%{crate}
 Version:        0.4.0
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Core random number generator traits and tools for implementation
 
 # Upstream license specification: MIT/Apache-2.0
 License:        MIT or ASL 2.0
 URL:            https://crates.io/crates/rand_core
-Source0:        https://crates.io/api/v1/crates/%{crate}/%{version}/download#/%{crate}-%{version}.crate
+Source:         %{crates_source}
 
 ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
-BuildRequires:  (crate(serde/default) >= 1.0.0 with crate(serde/default) < 2.0.0)
-BuildRequires:  (crate(serde_derive/default) >= 1.0.38 with crate(serde_derive/default) < 2.0.0)
 
 %global _description \
 Core random number generator traits and tools for implementation.
@@ -113,7 +111,7 @@ which use "std" feature of "%{crate}" crate.
 %ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
 
 %prep
-%autosetup -n %{crate}-%{version} -p1
+%autosetup -n %{crate}-%{version_no_tilde} -p1
 %cargo_prep
 
 %build
@@ -128,6 +126,9 @@ which use "std" feature of "%{crate}" crate.
 %endif
 
 %changelog
+* Sun Mar 10 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.4.0-3
+- Do not pull optional dependencies
+
 * Sat Feb 02 2019 Fedora Release Engineering <releng@fedoraproject.org> - 0.4.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild