diff --git a/qa/zcash/postponed-updates.txt b/qa/zcash/postponed-updates.txt
index a362a6ad0..d735dd658 100644
--- a/qa/zcash/postponed-updates.txt
+++ b/qa/zcash/postponed-updates.txt
@@ -21,6 +21,10 @@ native_ccache 4.6.2 2022-11-01
 native_ccache 4.6.3 2022-11-01
 
 # Clang and Rust are currently pinned to LLVM 14
+libcxx 15.0.0 2022-11-01
+libcxx 15.0.1 2022-11-01
+native_clang 15.0.0 2022-11-01
+native_clang 15.0.1 2022-11-01
 
 # We're never updating to this version
 bdb 18.1.40 2024-02-01