diff --git a/README.md b/README.md
index f208f1f..45fcb5a 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 CLI tool for downloading subtitles from napiprojekt.pl, fork of [gabrys/napi.py](https://github.com/gabrys/napi.py)
 
 ## prerequisites
-- Python 3.7 or newer
+- Python 3.9 or newer
 
 ## installation
 - `pip install napi-py` for user-wide installation
diff --git a/mypy.ini b/mypy.ini
index 2c31f82..a62c0c4 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,5 +1,5 @@
 [mypy]
 warn_unused_configs = True
 
-[mypy-py7zlib]
+[mypy-py7zr]
 ignore_missing_imports = True
\ No newline at end of file
diff --git a/napi/read_7z.py b/napi/read_7z.py
index 0af49a7..7a4cf0e 100644
--- a/napi/read_7z.py
+++ b/napi/read_7z.py
@@ -1,14 +1,71 @@
 from io import BytesIO
-from typing import Optional
-from py7zlib import Archive7z, ArchiveError
+from typing import Optional, Dict
+import threading
+import py7zr
 
 NAPI_ARCHIVE_PASSWORD = "iBlm8NTigvru0Jr0"
 
 
-def un7zip_api_response(content_7z: bytes) -> Optional[bytes]:
+class InMemoryIO(py7zr.io.Py7zIO):
+    def __init__(self, fname: str):
+        self.fname = fname
+        self._buf = bytearray()
+        self._length = 0
+        self._lock = threading.Lock()
+
+    def write(self, data: bytes) -> None:
+        with self._lock:
+            self._buf.extend(data)
+            self._length += len(data)
+
+    def read(self, size: Optional[int] = None) -> bytes:
+        return b""
+
+    def seek(self, offset: int, whence: int = 0) -> int:
+        return offset
+
+    def flush(self) -> None:
+        pass
+
+    def size(self) -> int:
+        return self._length
+
+    def getvalue(self) -> bytes:
+        with self._lock:
+            return bytes(self._buf)
+
+
+class InMemoryFactory(py7zr.io.WriterFactory):
+    def __init__(self, target_filename: Optional[str] = None):
+        self.products: Dict[str, InMemoryIO] = {}
+        self.target_filename = target_filename
+
+    def create(self, filename: str) -> py7zr.io.Py7zIO:
+        if self.target_filename is not None and filename != self.target_filename:
+            product = InMemoryIO(filename)
+        else:
+            product = InMemoryIO(filename)
+            self.products[filename] = product
+        return product
+
+
+def un7zip_api_response(content_7z: bytes, target_filename: Optional[str] = None) -> Optional[bytes]:
     try:
         buffer = BytesIO(content_7z)
-        archive = Archive7z(buffer, password=NAPI_ARCHIVE_PASSWORD)
-        return archive.getmember(0).read()
-    except ArchiveError:
+        with py7zr.SevenZipFile(buffer, mode="r", password=NAPI_ARCHIVE_PASSWORD) as archive:
+            factory = InMemoryFactory(target_filename=target_filename)
+            archive.extractall(factory=factory)
+
+        if target_filename:
+            product = factory.products.get(target_filename)
+            return product.getvalue() if product else None
+
+        if not factory.products:
+            return None
+        first_product = next(iter(factory.products.values()))
+        return first_product.getvalue()
+
+    except (py7zr.exceptions.Bad7zFile,
+            py7zr.exceptions.PasswordRequired,
+            py7zr.exceptions.UnsupportedCompressionMethodError):
         return None
diff --git a/pyproject.toml b/pyproject.toml
index 1f62c46..8046635 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "napi-py"
-version = "1.2.4"
+version = "1.2.5"
 description = "CLI tool for downloading subtitles from napiprojekt.pl"
 authors = ["emkor93 <emkor93@gmail.com>"]
 license = "GPL-3.0 License"
@@ -11,11 +11,11 @@ keywords = ["napiprojekt", "subs", "subtitles", "movie", "film"]
 packages = [{ include = "napi" }]
 
 [tool.poetry.dependencies]
-python = "^3.7"
-pylzma = "^0.5.0"
+python = "^3.9"
+py7zr = "^1.0.0"
 chardet = "^5.2.0"
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 mypy = "^1.4.0"
 pytest = "^7.4.4"
 black = "^22.3.0"
@@ -29,4 +29,4 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.black]
 line-length = 120
-target-version = ['py37', 'py38', 'py39', 'py310']
+target-version = ['py39', 'py310']