diff --git a/.github/actions/setup-smplx/action.yml b/.github/actions/setup-smplx/action.yml
deleted file mode 100644
index 5b2eff4..0000000
--- a/.github/actions/setup-smplx/action.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-name: setup-smplx
-
-inputs:
-  commit-sha:
-    description: "Commit in repository to use"
-    required: false
-    default: "master"
-  owner-repo:
-    description: "Owner repo on Github to use"
-    required: false
-    default: "BlockstreamResearch/smplx"
-
-runs:
-  using: composite
-  steps:
-    - name: Install smplx-cli via simplexup
-      shell: bash
-      run: |
-        set -euo pipefail
-        REVISION="${{ inputs.commit-sha }}"
-        OWNER_REPO="${{ inputs.owner-repo }}"
-        bash "$GITHUB_WORKSPACE/.github/scripts/setup-smplx" "${REVISION}" "${OWNER_REPO}"
diff --git a/.github/scripts/setup-smplx b/.github/scripts/setup-smplx
deleted file mode 100644
index 0cfc330..0000000
--- a/.github/scripts/setup-smplx
+++ /dev/null
@@ -1,68 +0,0 @@
-#!/usr/bin/env bash
-
-set -euo pipefail
-
-say() {
-  printf "setup-smplx: %s\n" "$1"
-}
-
-err() {
-  say "$1" >&2
-  exit 1
-}
-
-main() {
-  # Parse and validate arguments
-  COMMIT_SHA="${1:-}"
-  OWNER_REPO="${2:-}"
-  FETCH_REF="${COMMIT_SHA:-master}"
-  FILE_PATH="simplexup/install"
-
-  if [ "$#" -lt 2 ]; then
-    err "Usage: setup-smplx <revision> <owner_repo>"
-  fi
-
-  if [ -z "$OWNER_REPO" ]; then
-    err "no OWNER_REPO variable set"
-  fi
-
-  # Download and execute the initial install script
-  RAW_URL="https://raw.githubusercontent.com/${OWNER_REPO}/${FETCH_REF}/${FILE_PATH}"
-  say "Fetching ${FILE_PATH} from ${RAW_URL}"
-
-  curl -fsSL --retry 5 --retry-all-errors --retry-delay 2 "${RAW_URL}" | bash
-
-  # Download the simplexup executable
-  FILE_PATH="simplexup/simplexup"
-  RAW_URL="https://raw.githubusercontent.com/${OWNER_REPO}/${FETCH_REF}/${FILE_PATH}"
-
-  BASE_DIR="${XDG_CONFIG_HOME:-$HOME}"
-  SIMPLEX_DIR="${SIMPLEX_DIR:-$BASE_DIR/.simplex}"
-  SIMPLEX_BIN_DIR="$SIMPLEX_DIR/bin"
-  BIN_PATH="$SIMPLEX_BIN_DIR/simplexup"
-
-  # Ensure bin directory exists and download simplexup into it
-  mkdir -p "$SIMPLEX_BIN_DIR"
-  say "Fetching ${FILE_PATH} from ${RAW_URL}"
-
-  curl -fsSL --retry 5 --retry-all-errors --retry-delay 2 "${RAW_URL}" -o "$BIN_PATH"
-  chmod +x "$BIN_PATH"
-
-  # Execute simplexup, using a specific commit if provided (and not master's default release)
-  if [ "$FETCH_REF" != "master" ]; then
-      say "Using simplexup and simplex from commit: ${FETCH_REF}"
-      "$BIN_PATH" --commit "${FETCH_REF}"
-  else
-      say "Using simplexup from master branch and installing latest simplex"
-      "$BIN_PATH"
-  fi
-
-  # Add the Simplex binary directory to GitHub Actions PATH
-  echo "$SIMPLEX_BIN_DIR" >> "$GITHUB_PATH"
-
-  # Verify installation
-  say "Verifying simplex installation..."
-  "${SIMPLEX_BIN_DIR}/simplex" --version
-}
-
-main "$@"
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 209790a..da161af 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -45,7 +45,9 @@ jobs:
         uses: Swatinem/rust-cache@v2
 
       - name: Install simplex-cli
-        uses: ./.github/actions/setup-smplx
+        uses: BlockstreamResearch/simplicityhl-toolchain@v0.0.2
+        with:
+          components: simplex
 
       - name: Generate contract artifacts
         shell: bash