diff --git a/enos/modules/build_local/templates/build.sh b/enos/modules/build_local/templates/build.sh
index a3807f4d6..160bd2f80 100755
--- a/enos/modules/build_local/templates/build.sh
+++ b/enos/modules/build_local/templates/build.sh
@@ -7,7 +7,7 @@ set -eux -o pipefail
 env
 
 # Requirements
-npm install --global yarn || true
+npm install --global pnpm || true
 
 # Go to the root of the boundary repo
 root_dir="$(git rev-parse --show-toplevel)"
diff --git a/enos/modules/test_e2e_ui/main.tf b/enos/modules/test_e2e_ui/main.tf
index 72896bce3..f026c04c3 100644
--- a/enos/modules/test_e2e_ui/main.tf
+++ b/enos/modules/test_e2e_ui/main.tf
@@ -238,7 +238,7 @@ resource "enos_local_exec" "run_e2e_test" {
     E2E_WORKER_TAG_EGRESS         = var.worker_tag_egress
   }
 
-  inline = var.debug_no_run ? [""] : ["set -o pipefail; PATH=\"${var.local_boundary_dir}:$PATH\" yarn --cwd ${var.local_boundary_ui_src_dir}/ui/admin run e2e 2>&1 | tee ${path.module}/../../test-e2e-ui.log"]
+  inline = var.debug_no_run ? [""] : ["set -o pipefail; PATH=\"${var.local_boundary_dir}:$PATH\" pnpm --cwd ${var.local_boundary_ui_src_dir}/ui/admin run e2e 2>&1 | tee ${path.module}/../../test-e2e-ui.log"]
 }
 
 output "test_results" {
diff --git a/scripts/build-ui.sh b/scripts/build-ui.sh
index 36e1f93ef..89e6c03cc 100755
--- a/scripts/build-ui.sh
+++ b/scripts/build-ui.sh
@@ -58,8 +58,8 @@ if which gh &> /dev/null;  then
     fi
 fi
 
-if ! which yarn &> /dev/null; then
-    echo "Yarn must be installed to build ui assets from a git clone.\nPlease ensure Node v14+ and Yarn v1.22.10+ are installed."
+if ! which pnpm &> /dev/null; then
+    echo "Pnpm must be installed to build ui assets from a git clone.\nPlease ensure Node v20+ and Pnpm v10+ are installed."
     exit 1
 fi
 
@@ -81,6 +81,6 @@ git checkout "${UI_COMMITISH}"
 git pull --ff-only origin "${UI_COMMITISH}"
 git reset --hard "${UI_COMMITISH}"
 
-yarn install
-EDITION=${UI_EDITION} yarn build
+pnpm install
+EDITION=${UI_EDITION} pnpm build
 popd