diff --git a/buildenv b/buildenv
index 4c62f6f..0eb076e 100644
--- a/buildenv
+++ b/buildenv
@@ -1,5 +1,5 @@
 # bump: cmake-version /CMAKE_VERSION="(.*)"/ https://github.com/Kitware/CMake.git|semver:*
-CMAKE_VERSION="3.31.5"
+CMAKE_VERSION="3.31.6"
 
 export ZOPEN_BUILD_LINE="STABLE"
 export ZOPEN_CHECK_TIMEOUT=100000 # ~30 hrs