diff --git a/.devcontainer/DockerfileUpstream b/.devcontainer/DockerfileUpstream
index c00dc510e..af1fab216 100644
--- a/.devcontainer/DockerfileUpstream
+++ b/.devcontainer/DockerfileUpstream
@@ -6,7 +6,7 @@ ARG STACK_VERSION=2.11.1
 ARG STACK_RESOLVER=lts-18.28
 ARG CABAL_VERSION=3.6.2.0
 ARG HLS_VERSION=2.0.0.1
-ARG LLVM_VERSION=16
+ARG LLVM_VERSION=12
 
 ENV USERNAME=${USERNAME} \
     USER_UID=1000 \