diff --git a/orchestration/Dockerfile.parts/mimalloc/Dockerfile.alpine b/orchestration/Dockerfile.parts/mimalloc/Dockerfile.alpine
index 35770ac8..91328435 100644
--- a/orchestration/Dockerfile.parts/mimalloc/Dockerfile.alpine
+++ b/orchestration/Dockerfile.parts/mimalloc/Dockerfile.alpine
@@ -3,6 +3,7 @@ FROM alpine:latest as mimalloc
 RUN apk update && apk upgrade && apk --no-cache add gcc g++ libc-dev make cmake git
 RUN git clone https://github.com/microsoft/mimalloc && \
   cd mimalloc && \
+  git checkout 43ce4bd7fd34bcc730c1c7471c99995597415488 && \
   mkdir -p out/secure && \
   cd out/secure && \
   cmake -DMI_SECURE=ON ../.. && \
diff --git a/orchestration/Dockerfile.parts/mimalloc/Dockerfile.debian b/orchestration/Dockerfile.parts/mimalloc/Dockerfile.debian
index a61be70f..def8ad82 100644
--- a/orchestration/Dockerfile.parts/mimalloc/Dockerfile.debian
+++ b/orchestration/Dockerfile.parts/mimalloc/Dockerfile.debian
@@ -3,6 +3,7 @@ FROM debian:bookworm-slim as mimalloc
 RUN apt update && apt upgrade -y && apt install -y gcc g++ make cmake git
 RUN git clone https://github.com/microsoft/mimalloc && \
   cd mimalloc && \
+  git checkout 43ce4bd7fd34bcc730c1c7471c99995597415488 && \
   mkdir -p out/secure && \
   cd out/secure && \
   cmake -DMI_SECURE=ON ../.. && \