diff --git a/zstd-1.3.8.tar.gz b/zstd-1.3.8.tar.gz
deleted file mode 100644
index a206552..0000000
--- a/zstd-1.3.8.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:293fa004dfacfbe90b42660c474920ff27093e3fb6c99f7b76e6083b21d6d48e
-size 1862954
diff --git a/zstd-1.4.0.tar.gz b/zstd-1.4.0.tar.gz
new file mode 100644
index 0000000..fad39ef
--- /dev/null
+++ b/zstd-1.4.0.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7f323f0e0c18488748f3d9b2d4353f00e904ea2ccd0372ea04d7f77aa1156557
+size 1886068
diff --git a/zstd.changes b/zstd.changes
index a36ca99..303ef25 100644
--- a/zstd.changes
+++ b/zstd.changes
@@ -1,3 +1,14 @@
+-------------------------------------------------------------------
+Wed Apr 17 11:30:30 UTC 2019 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to new upstream release 1.4.0
+  * perf: level 1 compression speed was improved by ~6–8%
+  * cli: added --[no-]compress-literals flag to enable or disable
+    literal compression
+- Reword "real-time" in description by some actual statistics,
+  because 603MB/s (lowest zstd level) is not "real-time" for
+  quite some applications.
+
 -------------------------------------------------------------------
 Sat Jan  5 13:57:58 UTC 2019 - astieger@suse.com
 
diff --git a/zstd.spec b/zstd.spec
index 6ffbee5..ade1f37 100644
--- a/zstd.spec
+++ b/zstd.spec
@@ -12,14 +12,14 @@
 # license that conforms to the Open Source Definition (Version 1.9)
 # published by the Open Source Initiative.
 
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
+# Please submit bugfixes or comments via https://bugs.opensuse.org/
 #
 
 
 %define major 1
 %define libname lib%{name}%{major}
 Name:           zstd
-Version:        %{major}.3.8
+Version:        %{major}.4.0
 Release:        0
 Summary:        Zstandard compression tools
 License:        BSD-3-Clause AND GPL-2.0-only
@@ -35,14 +35,18 @@ BuildRequires:  googletest-devel
 BuildRequires:  pkgconfig
 
 %description
-Zstd, short for Zstandard, is a lossless compression algorithm,
-targeting real-time compression scenarios at zlib-level compression ratio.
+Zstd, short for Zstandard, is a lossless compression algorithm. Speed
+vs. compression trade-off is configurable in small increments.
+Decompression speed is preserved and remains roughly the same at all
+settings, a property shared by most LZ compression algorithms, such
+as zlib or lzma.
 
-Zstd can also offer stronger compression ratios at the cost of
-compression speed. Speed vs. compression trade-off is configurable by
-small increments. Decompression speed is preserved and remains
-roughly the same at all settings, a property shared by most LZ
-compression algorithms, such as zlib or lzma.
+At roughly the same ratio, zstd (v1.3.5) achieves ~600%% faster
+compression than zlib. At roughly the same time, zstd achives a ~12%%
+better ratio than gzip. LZMA outperforms zstd by ~10%% faster
+compression for same ratio, or ~9%% size reduction for same time.
+
+# This compression summary is based on https://lists.opensuse.org/opensuse-factory/2018-10/msg00111.html
 
 %package -n %{libname}
 Summary:        Zstd compression library
@@ -50,7 +54,7 @@ Group:          System/Libraries
 
 %description -n %{libname}
 Zstd, short for Zstandard, is a lossless compression algorithm,
-targeting real-time compression scenarios at zlib-level compression ratio.
+targeting faster compression than zlib at comparable ratios.
 
 This subpackage contains the implementation as a shared library.
 
@@ -62,7 +66,7 @@ Requires:       glibc-devel
 
 %description -n lib%{name}-devel
 Zstd, short for Zstandard, is a lossless compression algorithm,
-targeting real-time compression scenarios at zlib-level compression ratio.
+targeting faster compression than zlib at comparable ratios.
 
 Needed for compiling programs that link with the library.
 
@@ -74,7 +78,7 @@ Requires:       lib%{name}-devel = %{version}
 
 %description -n lib%{name}-devel-static
 Zstd, short for Zstandard, is a lossless compression algorithm,
-targeting real-time compression scenarios at zlib-level compression ratio.
+targeting faster compression than zlib at comparable ratios.
 
 Needed for compiling programs that link with the library.