diff --git a/.gitignore b/.gitignore
index 8b244cd..080ff98 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 /portable-atomic-1.3.1.crate
 /portable-atomic-1.3.2.crate
 /portable-atomic-1.3.3.crate
+/portable-atomic-1.4.0.crate
diff --git a/rust-portable-atomic.spec b/rust-portable-atomic.spec
index ac63a88..7f88802 100644
--- a/rust-portable-atomic.spec
+++ b/rust-portable-atomic.spec
@@ -6,7 +6,7 @@
 %global crate portable-atomic
 
 Name:           rust-portable-atomic
-Version:        1.3.3
+Version:        1.4.0
 Release:        %autorelease
 Summary:        Portable atomic types including support for 128-bit atomics, atomic float, etc
 
@@ -35,7 +35,6 @@ use the "%{crate}" crate.
 %license %{crate_instdir}/LICENSE-APACHE
 %license %{crate_instdir}/LICENSE-MIT
 %doc %{crate_instdir}/CHANGELOG.md
-%doc %{crate_instdir}/DEVELOPMENT.md
 %doc %{crate_instdir}/README.md
 %{crate_instdir}/
 
@@ -63,6 +62,18 @@ use the "critical-section" feature of the "%{crate}" crate.
 %files       -n %{name}+critical-section-devel
 %ghost %{crate_instdir}/Cargo.toml
 
+%package     -n %{name}+disable-fiq-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+disable-fiq-devel %{_description}
+
+This package contains library source intended for building other packages which
+use the "disable-fiq" feature of the "%{crate}" crate.
+
+%files       -n %{name}+disable-fiq-devel
+%ghost %{crate_instdir}/Cargo.toml
+
 %package     -n %{name}+fallback-devel
 Summary:        %{summary}
 BuildArch:      noarch
@@ -99,6 +110,18 @@ use the "require-cas" feature of the "%{crate}" crate.
 %files       -n %{name}+require-cas-devel
 %ghost %{crate_instdir}/Cargo.toml
 
+%package     -n %{name}+s-mode-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+s-mode-devel %{_description}
+
+This package contains library source intended for building other packages which
+use the "s-mode" feature of the "%{crate}" crate.
+
+%files       -n %{name}+s-mode-devel
+%ghost %{crate_instdir}/Cargo.toml
+
 %package     -n %{name}+serde-devel
 Summary:        %{summary}
 BuildArch:      noarch
@@ -123,6 +146,18 @@ use the "std" feature of the "%{crate}" crate.
 %files       -n %{name}+std-devel
 %ghost %{crate_instdir}/Cargo.toml
 
+%package     -n %{name}+unsafe-assume-single-core-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+unsafe-assume-single-core-devel %{_description}
+
+This package contains library source intended for building other packages which
+use the "unsafe-assume-single-core" feature of the "%{crate}" crate.
+
+%files       -n %{name}+unsafe-assume-single-core-devel
+%ghost %{crate_instdir}/Cargo.toml
+
 %prep
 %autosetup -n %{crate}-%{version_no_tilde} -p1
 %cargo_prep
diff --git a/sources b/sources
index 0e0970b..f3dc49e 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (portable-atomic-1.3.3.crate) = f39a77e5c7e406a7e11adc0305d0ad146a62e59c26b6b6b4f4cddbf9f2839f313413859939e2765fa81c160cfb2debde253f1a777e10a2222142f4fcac04ec01
+SHA512 (portable-atomic-1.4.0.crate) = 2cf5e975bbdce6262496f44c1d5bfc0501c620835df6c67d00d6a21e6d5a495b765a67863b41d140b770a5bf488746fa3d5b7917fc467d5d8cc66b23a1b95f47