diff --git a/npm_install.py b/npm_install.py
index 1b7776c..b93f87c 100644
--- a/npm_install.py
+++ b/npm_install.py
@@ -215,11 +215,10 @@ def setup_certbot_venv(venv_dir: Path = Path("/opt/certbot")):
     PYENV_ROOT = Path("/opt/npm/.pyenv")
     PYENV_OWNER = "npm"
     PYTHON_VERSION = "3.11.11"
-    PYENV_BIN_CANDIDATES = ["pyenv", "/usr/bin/pyenv", "/usr/lib/pyenv/bin/pyenv"]
 
     try:
         apt_try_install([
-            "pyenv", "build-essential", "gcc", "make", "pkg-config",
+            "git", "build-essential", "gcc", "make", "pkg-config",
             "libssl-dev", "zlib1g-dev", "libbz2-dev", "libreadline-dev",
             "libsqlite3-dev", "tk-dev", "libncursesw5-dev", "libgdbm-dev",
             "libffi-dev", "uuid-dev", "liblzma-dev", "ca-certificates", "curl"
@@ -227,7 +226,7 @@ def setup_certbot_venv(venv_dir: Path = Path("/opt/certbot")):
     except Exception:
         run(["apt-get", "update"], check=False)
         run(["apt-get", "install", "-y",
-             "pyenv", "build-essential", "gcc", "make", "pkg-config",
+             "git", "build-essential", "gcc", "make", "pkg-config",
              "libssl-dev", "zlib1g-dev", "libbz2-dev", "libreadline-dev",
              "libsqlite3-dev", "tk-dev", "libncursesw5-dev", "libgdbm-dev",
              "libffi-dev", "uuid-dev", "liblzma-dev", "ca-certificates", "curl"
@@ -237,42 +236,43 @@ def setup_certbot_venv(venv_dir: Path = Path("/opt/certbot")):
     PYENV_ROOT.mkdir(parents=True, exist_ok=True)
     run(["chown", "-R", f"{PYENV_OWNER}:{PYENV_OWNER}", "/opt/npm"], check=False)
 
-    pyenv_bin = next((c for c in PYENV_BIN_CANDIDATES if shutil.which(c)), None)
-    if not pyenv_bin:
-        raise RuntimeError("Nie znaleziono 'pyenv' (spróbuj /usr/bin/pyenv lub /usr/lib/pyenv/bin/pyenv).")
+    upstream_pyenv_bin = PYENV_ROOT / "bin" / "pyenv"
+    if not upstream_pyenv_bin.exists():
+        with step(f"Cloning upstream pyenv into {PYENV_ROOT}"):
+            run([
+                "sudo", "-u", PYENV_OWNER, "-H",
+                "env", f"HOME=/opt/npm", f"PYENV_ROOT={PYENV_ROOT}",
+                "bash", "-lc",
+                f'git clone --depth=1 https://github.com/pyenv/pyenv.git "{PYENV_ROOT}"'
+            ])
+        run(["chown", "-R", f"{PYENV_OWNER}:{PYENV_OWNER}", str(PYENV_ROOT)], check=False)
 
     env_pyenv = os.environ.copy()
     env_pyenv.update({
-        "HOME": "/opt/npm",                         # ważne: wrapper pyenv robi cd $HOME
+        "HOME": "/opt/npm",
         "PYENV_ROOT": str(PYENV_ROOT),
-        "PATH": "/usr/lib/pyenv/bin:/usr/bin:/bin"  # pluginy pyenv (install) + system
+        "PATH": f"{PYENV_ROOT}/bin:/usr/bin:/bin"
     })
-    with step(f"Installing Python {PYTHON_VERSION} via pyenv into {PYENV_ROOT}"):
+    with step(f"Installing Python {PYTHON_VERSION} via upstream pyenv into {PYENV_ROOT}"):
         run([
-            "sudo", "-u", PYENV_OWNER, "-s",
+            "sudo", "-u", PYENV_OWNER, "-H",
             "env",
             f"HOME={env_pyenv['HOME']}",
             f"PYENV_ROOT={env_pyenv['PYENV_ROOT']}",
             f"PATH={env_pyenv['PATH']}",
             "bash", "-lc",
-            f'cd /opt/npm && "{pyenv_bin}" install -s {PYTHON_VERSION}'
+            f'"{upstream_pyenv_bin}" install -s {PYTHON_VERSION}'
         ], env=env_pyenv)
 
     profile_snippet = f"""# Auto-generated by setup_certbot_venv
 # Ustawienia pyenv dla uzytkownika '{PYENV_OWNER}'
 if [ -d "{PYENV_ROOT}" ]; then
   export PYENV_ROOT="{PYENV_ROOT}"
-  # Dopnij lokalne binarki pyenv (git-install) idempotentnie
   case ":$PATH:" in *":$PYENV_ROOT/bin:"*) ;; *) PATH="$PYENV_ROOT/bin:$PATH";; esac
-  # Dopnij systemowe binarki pyenv z pakietu Debiana idempotentnie
-  case ":$PATH:" in *":/usr/lib/pyenv/bin:"*) ;; *) PATH="/usr/lib/pyenv/bin:$PATH";; esac
   export PATH
-  # Inicjalizacja tylko dla interaktywnych powlok uzytkownika '{PYENV_OWNER}'
   case "$-" in *i*) _interactive=1 ;; *) _interactive=0 ;; esac
   if [ "$_interactive" = 1 ] && {{ [ "${{USER:-}}" = "{PYENV_OWNER}" ] || [ "${{SUDO_USER:-}}" = "{PYENV_OWNER}" ]; }}; then
-    if command -v pyenv >/dev/null 2>&1; then
-      eval "$(pyenv init -)"
-    elif [ -x "{PYENV_ROOT}/bin/pyenv" ]; then
+    if [ -x "{PYENV_ROOT}/bin/pyenv" ]; then
       eval "$("{PYENV_ROOT}/bin/pyenv" init -)"
     fi
   fi
@@ -318,7 +318,6 @@ fi
     run(["chown", "-R", f"{PYENV_OWNER}:{PYENV_OWNER}", str(PYENV_ROOT)], check=False)
 
 
-
 def configure_letsencrypt():
     with step("configure letsencrypt"):
         run(["chown", "-R", "npm:npm", "/opt/certbot"], check=False)