diff --git a/.gitignore b/.gitignore
index fe7978b..296ab8c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /futures-task-0.3.1.crate
 /futures-task-0.3.3.crate
 /futures-task-0.3.4.crate
+/futures-task-0.3.5.crate
diff --git a/rust-futures-task.spec b/rust-futures-task.spec
index 92363e8..3a81947 100644
--- a/rust-futures-task.spec
+++ b/rust-futures-task.spec
@@ -6,7 +6,7 @@
 %global crate futures-task
 
 Name:           rust-%{crate}
-Version:        0.3.4
+Version:        0.3.5
 Release:        1%{?dist}
 Summary:        Tools for working with tasks
 
@@ -76,6 +76,18 @@ which use "cfg-target-has-atomic" feature of "%{crate}" crate.
 %files       -n %{name}+cfg-target-has-atomic-devel
 %ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
 
+%package     -n %{name}+once_cell-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+once_cell-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "once_cell" feature of "%{crate}" crate.
+
+%files       -n %{name}+once_cell-devel
+%ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+
 %package     -n %{name}+std-devel
 Summary:        %{summary}
 BuildArch:      noarch
@@ -119,6 +131,9 @@ which use "unstable" feature of "%{crate}" crate.
 %endif
 
 %changelog
+* Sat May 09 2020 Josh Stone <jistone@redhat.com> - 0.3.5-1
+- Update to 0.3.5
+
 * Mon Feb 10 2020 Josh Stone <jistone@redhat.com> - 0.3.4-1
 - Update to 0.3.4
 
diff --git a/sources b/sources
index 720bc2d..eaea913 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (futures-task-0.3.4.crate) = 429123bed02ef34c0eff955448ac643a161c2760e1ea63a6f9f74bd989a26e351d0782d380e03eb5108802fc17d104a20d3bde7ab353a460baaa2345f2c39a34
+SHA512 (futures-task-0.3.5.crate) = 9affcfe1c64ff66cef77615d39c2e69e40480aa7fb0d1a0b136edeb9533b336e3e1156bc0bb14120a812f0f8d3d3266c556d9f0e4eec147fdcc175b3183dba52