diff --git a/1.5.3.tar.gz b/1.5.3.tar.gz
deleted file mode 100644
index 00926da..0000000
--- a/1.5.3.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:eece8a9e147d37997d425d5d2eeb2e757ad25adc30d6651467094f3b18609b5a
-size 386853
diff --git a/SPIRV-Headers-1.5.3.g18.tar.xz b/SPIRV-Headers-1.5.3.g18.tar.xz
new file mode 100644
index 0000000..70d43c2
--- /dev/null
+++ b/SPIRV-Headers-1.5.3.g18.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f78e5f1c8184ce4052a622f459877c51b684c5878aa09585d9e39b01be14fd15
+size 131812
diff --git a/_service b/_service
index eb3e039..7c34855 100644
--- a/_service
+++ b/_service
@@ -2,9 +2,9 @@
 	<service name="tar_scm" mode="disabled">
  		<param name="scm">git</param>
 		<param name="url">https://github.com/KhronosGroup/SPIRV-Headers</param>
-		<param name="revision">1.5.3</param>
+		<param name="revision">979924c8bc839e4cb1b69d03d48398551f369ce7</param>
 		<param name="parent-tag">1.5.3</param>
-		<param name="versionformat">1.5.3</param>
+		<param name="versionformat">1.5.3.g@TAG_OFFSET@</param>
 	</service>
 	<service name="recompress" mode="disabled">
 		<param name="file">*.tar</param>
diff --git a/spirv-headers.changes b/spirv-headers.changes
index a416abb..b911621 100644
--- a/spirv-headers.changes
+++ b/spirv-headers.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Aug 12 07:26:50 UTC 2020 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to snapshot 1.5.3.g18 (979924c8bc)
+  * Support for SPV_EXT_shader_atomic_float
+
 -------------------------------------------------------------------
 Fri May 29 17:05:17 UTC 2020 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/spirv-headers.spec b/spirv-headers.spec
index 0650e91..c0db5d0 100644
--- a/spirv-headers.spec
+++ b/spirv-headers.spec
@@ -17,14 +17,15 @@
 
 
 Name:           spirv-headers
-Version:        1.5.3
+Version:        1.5.3.g18
 Release:        0
 Summary:        Machine-readable files from the SPIR-V registry
 License:        MIT
 Group:          Development/Libraries/C and C++
 URL:            https://github.com/KhronosGroup/SPIRV-Headers
 
-Source:         https://github.com/KhronosGroup/SPIRV-Headers/archive/%version.tar.gz
+#Source:         https://github.com/KhronosGroup/SPIRV-Headers/archive/%version.tar.gz
+Source:         SPIRV-Headers-%version.tar.xz
 BuildArch:      noarch
 BuildRequires:  cmake >= 2.8
 BuildRequires:  fdupes