diff --git a/fir_ser/api/utils/app/iossignapi.py b/fir_ser/api/utils/app/iossignapi.py
index 18c9088..5d8ad9a 100644
--- a/fir_ser/api/utils/app/iossignapi.py
+++ b/fir_ser/api/utils/app/iossignapi.py
@@ -167,7 +167,7 @@ class AppDeveloperApiV2(object):
             req.get_subject().C = 'CN'
             req.get_subject().emailAddress = 'fly@fly.com'
             req.set_pubkey(key)
-            req.sign(key, 'sha256')
+            req.sign(key, b'sha256')
             csr_content = dump_certificate_request(FILETYPE_PEM, req)
             with open(csr_file_path, 'wb+') as f:
                 f.write(csr_content)
diff --git a/fir_ser/requirements.txt b/fir_ser/requirements.txt
index 3fc17b2..927c5b9 100644
--- a/fir_ser/requirements.txt
+++ b/fir_ser/requirements.txt
@@ -51,8 +51,10 @@ pycparser==2.20
 pycryptodome==3.9.7
 pydot==1.4.1
 Pygments==2.5.2
+PyJWT==1.7.1
 PyMySQL==0.9.3
 PyNaCl==1.3.0
+pyOpenSSL==20.0.1
 pyparsing==2.4.6
 python-dateutil==2.8.1
 pytz==2019.3