diff --git a/.gitignore b/.gitignore
index e875910..15923c2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /portable-atomic-1.0.0.crate
 /portable-atomic-1.2.0.crate
+/portable-atomic-1.3.1.crate
diff --git a/rust-portable-atomic.spec b/rust-portable-atomic.spec
index 06b2be0..76f4d46 100644
--- a/rust-portable-atomic.spec
+++ b/rust-portable-atomic.spec
@@ -6,7 +6,7 @@
 %global crate portable-atomic
 
 Name:           rust-portable-atomic
-Version:        1.2.0
+Version:        1.3.1
 Release:        %autorelease
 Summary:        Portable atomic types including support for 128-bit atomics, atomic float, etc
 
@@ -87,6 +87,18 @@ use the "float" feature of the "%{crate}" crate.
 %files       -n %{name}+float-devel
 %ghost %{crate_instdir}/Cargo.toml
 
+%package     -n %{name}+require-cas-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+require-cas-devel %{_description}
+
+This package contains library source intended for building other packages which
+use the "require-cas" feature of the "%{crate}" crate.
+
+%files       -n %{name}+require-cas-devel
+%ghost %{crate_instdir}/Cargo.toml
+
 %package     -n %{name}+serde-devel
 Summary:        %{summary}
 BuildArch:      noarch
diff --git a/sources b/sources
index a9601db..f367e38 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (portable-atomic-1.2.0.crate) = 9d50e867e37a93784b5976f0c389974ff5eef083bdb0701e32bd6e27bf2900ff8180c945c480eb64a2e9e1cd058dd14d91cda9d655280c10d0c1a5eec1636391
+SHA512 (portable-atomic-1.3.1.crate) = 462ba2571a683f614a3cf9ddd2087e9a86e70df21d36293047a96aac276affa2a50949d0b2cae46c6a2d1a77dd975ff8c1c4d0b9f9b999aef97a3d98dcdd8d65