diff --git a/.gitignore b/.gitignore
index f62cac1..6fc86d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /imagequant-4.1.0.crate
 /imagequant-4.1.1.crate
+/imagequant-4.2.0.crate
diff --git a/rust-imagequant.spec b/rust-imagequant.spec
index 5b709ee..62f0a92 100644
--- a/rust-imagequant.spec
+++ b/rust-imagequant.spec
@@ -5,7 +5,7 @@
 %global crate imagequant
 
 Name:           rust-imagequant
-Version:        4.1.1
+Version:        4.2.0
 Release:        %autorelease
 Summary:        Convert 24/32-bit images to 8-bit palette with alpha channel
 
@@ -62,6 +62,18 @@ use the "_internal_c_ffi" feature of the "%{crate}" crate.
 %files       -n %{name}+_internal_c_ffi-devel
 %ghost %{crate_instdir}/Cargo.toml
 
+%package     -n %{name}+large_palettes-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+large_palettes-devel %{_description}
+
+This package contains library source intended for building other packages which
+use the "large_palettes" feature of the "%{crate}" crate.
+
+%files       -n %{name}+large_palettes-devel
+%ghost %{crate_instdir}/Cargo.toml
+
 %package     -n %{name}+threads-devel
 Summary:        %{summary}
 BuildArch:      noarch
diff --git a/sources b/sources
index f4dd463..8dddc9a 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (imagequant-4.1.1.crate) = cd8d4ada6c7c3c327def24809fbf6fac07597d0d1ff4e6f1a67e9e35a83d4e993cfe91fa284a51027d9bb1f0c250e51a5023f9ba34fee7345d22ad89ed72e5be
+SHA512 (imagequant-4.2.0.crate) = a809b4df3ad35ec15c9a12b2a3e4ab5dde6051a7f836777f16b3408f83c75678c295ae5af83e00780d281261911025cbfe56342b0e21bb95c50100c5bd2c4b80