diff --git a/Dockerfile b/Dockerfile
index d6f17dd..53c080e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,6 +14,7 @@ RUN : \
         gcc \
         git \
         gnupg2 \
+        gpg-agent \
         libblas3 \
         libc6 \
         libedit2 \
@@ -21,6 +22,7 @@ RUN : \
         libfile-homedir-perl \
         libgcc1 \
         libgdiplus \
+        libgmp-dev \
         libgssapi-krb5-2 \
         libicu74 \
         liblapack3 \
@@ -36,6 +38,7 @@ RUN : \
         ruby-dev \
         unzip \
         xdg-user-dirs \
+        xz-utils \
         zlib1g \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/* \
@@ -118,6 +121,24 @@ RUN : \
     && rm /tmp/node.tar.gz \
     && :
 
+ARG HASKELL_GHC=9.14.1
+ARG HASKELL_CABAL=3.18.1.0
+ENV \
+    BOOTSTRAP_HASKELL_ADJUST_CABAL_CONFIG=yes \
+    BOOTSTRAP_HASKELL_GHC_VERSION=0 \
+    BOOTSTRAP_HASKELL_INSTALL_NO_STACK=yes \
+    BOOTSTRAP_HASKELL_MINIMAL=1 \
+    BOOTSTRAP_HASKELL_NONINTERACTIVE=1 \
+    CABAL_DIR=/tmp/cabal \
+    GHCUP_INSTALL_BASE_PREFIX=/opt/haskell \
+    PATH=/opt/haskell/.ghcup/bin:$PATH
+RUN : \
+    && echo 'lang: haskell' \
+    && curl --proto '=https' --tlsv1.2 --silent --show-error --fail https://get-ghcup.haskell.org | sh \
+    && ghcup install ghc "$HASKELL_GHC" --set \
+    && ghcup install cabal "$HASKELL_CABAL" --set \
+    && :
+
 ARG RUST=1.89.0
 ARG RUSTUP_SHA256=c8d03f559a2335693379e1d3eaee76622b2a6580807e63bcd61faea709b9f664
 ARG RUSTUP_VERSION=1.28.0
diff --git a/bin/test b/bin/test
index fd49ff5..ebe58ae 100755
--- a/bin/test
+++ b/bin/test
@@ -147,6 +147,27 @@ def test_can_run_go_hook(tag: str, pc: str, podman: bool) -> None:
         _build_and_run(tag, tmpdir, pc, podman=podman)
 
 
+HASKELL_HOOK = '''\
+repos:
+-   repo: https://github.com/NixOS/nixfmt
+    rev: v1.5.0
+    hooks:
+    -   id: nixfmt
+'''
+
+
+def test_can_run_haskell_hook(tag: str, pc: str, podman: bool) -> None:
+    with tempfile.TemporaryDirectory() as tmpdir:
+        subprocess.check_call(('git', 'init', tmpdir))
+        with open(os.path.join(tmpdir, '.pre-commit-config.yaml'), 'w') as f:
+            f.write(HASKELL_HOOK)
+        with open(os.path.join(tmpdir, 't.nix'), 'w') as f:
+            f.write('1\n')
+        subprocess.check_call(('git', '-C', tmpdir, 'add', '.'))
+
+        _build_and_run(tag, tmpdir, pc, podman=podman)
+
+
 RUST_HOOK = '''\
 repos:
 -   repo: local
@@ -454,6 +475,8 @@ def main() -> int:
         test_can_install_ffi_gem(full_tag)
         print(' can run go hooks '.center(79, '='), flush=True)
         test_can_run_go_hook(full_tag, pc, podman=args.podman)
+        print(' can run haskell hooks '.center(79, '='), flush=True)
+        test_can_run_haskell_hook(full_tag, pc, podman=args.podman)
         print(' can run rust hooks '.center(79, '='), flush=True)
         test_can_run_rust_hook(full_tag, pc, podman=args.podman)
         print(' can run swift hooks '.center(79, '='), flush=True)