diff --git a/CMakeLists.txt b/CMakeLists.txt
index dfb2ddf..b3ad224 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.20)
 include(cmake/color.cmake)
 
-set(BLT_VERSION 0.17.21)
+set(BLT_VERSION 0.17.22)
 set(BLT_TEST_VERSION 0.0.1)
 
 set(BLT_TARGET BLT)
diff --git a/include/blt/std/utility.h b/include/blt/std/utility.h
index 501ad95..749a2cc 100644
--- a/include/blt/std/utility.h
+++ b/include/blt/std/utility.h
@@ -94,8 +94,17 @@ namespace blt
 
 #if defined(__GNUC__) || defined(__llvm__)
     #define BLT_ATTRIB_NO_INLINE __attribute__ ((noinline))
-    #define BLT_ATTRIB_CONST __attribute__((const))
-    #define BLT_ATTRIB_PURE __attribute__((pure))
+    /**
+     * means that the return value is solely a function of the arguments,
+     * and if any of the arguments are pointers, then the pointers must not be dereferenced.
+     */
+    #define BLT_ATTRIB_NO_SIDE_EFFECTS __attribute__((const))
+    /**
+     * the function has no side effects and the value returned depends on the arguments and the state of global variables.
+     * Therefore it is safe for the optimizer to elide some calls to it, if the arguments are the same,
+     * and the caller did not do anything to change the state of the globals in between the calls.
+     */
+    #define BLT_ATTRIB_GLOBAL_READ_ONLY __attribute__((pure))
 #else
     #if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
         #define BLT_ATTRIB_NO_INLINE __declspec(noinline)
diff --git a/libraries/parallel-hashmap b/libraries/parallel-hashmap
index d88c5e1..e5b892b 160000
--- a/libraries/parallel-hashmap
+++ b/libraries/parallel-hashmap
@@ -1 +1 @@
-Subproject commit d88c5e15079047777b418132ece5879e7c9aaa2b
+Subproject commit e5b892baed478513adcb6425773cae1eda033057