diff --git a/env/references.asciidoc b/env/references.asciidoc
index f5dabc473..6de0c4e4a 100644
--- a/env/references.asciidoc
+++ b/env/references.asciidoc
@@ -36,7 +36,7 @@
     3.0, Unified`", https://www.khronos.org/registry/OpenCL/ .
 //    References are to sections and tables of this specific version, although
 //    other versions exists.
-  . [[spirv-spec]] "`SPIR-V Specification, Version 1.5, Unified`",
+  . [[spirv-spec]] "`SPIR-V Specification, Version 1.6, Unified`",
     https://www.khronos.org/registry/spir-v/ .
   . [[opencl-extended-instruction-set]] "`OpenCL Extended Instruction Set
     Specification`", https://www.khronos.org/registry/spir-v/ .