diff --git a/automated/build.sh b/automated/build.sh
index 36fae064..63724b04 100755
--- a/automated/build.sh
+++ b/automated/build.sh
@@ -83,7 +83,7 @@ rm -f curator stack -- *.bz2
 curl -L "https://github.com/commercialhaskell/curator/releases/download/commit-28f0bf6b153b7b4317a5613e1067a2e7f42b5f5a/curator.bz2" | bunzip2 > curator
 chmod +x curator
 
-STACK_VERSION=3.7.1
+STACK_VERSION=3.9.1
 # rc url
 #curl -L https://github.com/commercialhaskell/stack/releases/download/rc%2Fv${STACK_VERSION}/stack-${STACK_VERSION}-linux-x86_64-bin > stack
 curl -L https://github.com/commercialhaskell/stack/releases/download/v${STACK_VERSION}/stack-${STACK_VERSION}-linux-x86_64-bin > stack
diff --git a/automated/dockerfiles/lts-24.12/Dockerfile b/automated/dockerfiles/lts-24.12/Dockerfile
index c078871b..c0399c1d 100644
--- a/automated/dockerfiles/lts-24.12/Dockerfile
+++ b/automated/dockerfiles/lts-24.12/Dockerfile
@@ -6,6 +6,7 @@ ARG GHC_VERSION=9.10.3
 ARG LTS_SLUG=lts-24.12
 # update to 0.1.3.1 for lts-25
 ARG PID1_VERSION=0.1.2.0
+# update to 3.9.1 for lts-25
 ARG STACK_VERSION=3.7.1
 ARG CUDA_VERSION=10.0
 ARG JVM_PATH=/usr/lib/jvm/java-8-openjdk-amd64
diff --git a/docker/01-build-server.sh b/docker/01-build-server.sh
index 46d23840..f837e474 100755
--- a/docker/01-build-server.sh
+++ b/docker/01-build-server.sh
@@ -24,6 +24,6 @@ unzip -q awscliv2.zip
 )
 rm -rf /tmp/awscli
 
-STACK_VERSION=3.7.1
+STACK_VERSION=3.9.1
 curl -L https://github.com/commercialhaskell/stack/releases/download/v${STACK_VERSION}/stack-${STACK_VERSION}-linux-x86_64-bin > /usr/bin/stack
 chmod +x /usr/bin/stack