diff --git a/.azure-pipelines/azure-pipelines-osx.yml b/.azure-pipelines/azure-pipelines-osx.yml
index cde77002..d08eed2c 100755
--- a/.azure-pipelines/azure-pipelines-osx.yml
+++ b/.azure-pipelines/azure-pipelines-osx.yml
@@ -5,7 +5,7 @@
 jobs:
 - job: osx
   pool:
-    vmImage: macOS-13
+    vmImage: macOS-15
   strategy:
     matrix:
       osx_64_:
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 64d88088..daa83e32 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -1,4 +1,4 @@
-{% set version = "21.1.0" %}
+{% set version = "21.1.1" %}
 # check https://clang.llvm.org/docs/OpenMPSupport.html
 # occasionally to see last fully supported openmp ver.
 {% set openmp_ver = "4.5" %}
@@ -17,7 +17,7 @@ package:
 
 source:
   url: https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-{{ version.replace(".rc", "-rc") }}.tar.gz
-  sha256: fba0618cf8de48ec05880c446edd756a2669157eab9d29949e971c77da10275f
+  sha256: 5f048351ee63050d7fa45b6a1160768fb222a8d306a89e1344515ef7a4bcd278
   # name folder for easier deletion; we do the equivalent of downloading
   # the subproject sources, so the work folder then has openmp in it;
   # for details see build scripts