diff --git a/README.md b/README.md
index 72b44d6..01f7436 100644
--- a/README.md
+++ b/README.md
@@ -60,13 +60,13 @@ Instalação
 -----------
 
 ```sh
-pip3 install --user https://github.com/leotada/PyNFe/archive/master.zip
+pip3 install --user https://github.com/TadaSoftware/PyNFe/archive/master.zip
 ```
 
 Opcional para NFS-e:
 
 ```sh
-pip3 install --user -r https://github.com/leotada/PyNFe/raw/master/requirements-nfse.txt
+pip3 install --user -r https://github.com/TadaSoftware/PyNFe/raw/master/requirements-nfse.txt
 ```
 
 Exemplos de uso
diff --git a/pynfe/processamento/comunicacao.py b/pynfe/processamento/comunicacao.py
index f9bd13b..0aa8a7e 100644
--- a/pynfe/processamento/comunicacao.py
+++ b/pynfe/processamento/comunicacao.py
@@ -102,12 +102,16 @@ class ComunicacaoSefaz(Comunicacao):
                     return 1, retorno, nota_fiscal
             else:
                 # Retorna id do protocolo para posterior consulta em caso de sucesso.
-                rec = etree.fromstring(retorno.text)
+                try:
+                    rec = etree.fromstring(retorno.text)
+                except ValueError:
+                    # em SP retorno.text apresenta erro
+                    rec = etree.fromstring(retorno.content)
                 rec = rec[0][0]
                 status = rec.xpath("ns:retEnviNFe/ns:cStat", namespaces=ns)[0].text
                 # Lote Recebido com Sucesso!
                 if status == '103':
-                    nrec = rec.xpath("ns:infRec/ns:nRec", namespaces=ns)[0].text
+                    nrec = rec.xpath("ns:retEnviNFe/ns:infRec/ns:nRec", namespaces=ns)[0].text
                     return 0, nrec, nota_fiscal
         return 1, retorno, nota_fiscal
 
diff --git a/requirements.txt b/requirements.txt
index 88bf614..1f07a0e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@
 pyopenssl
 requests
 lxml
+signxml
 
 # Opcional para NFS-e
 #-r requirements-nfse.txt
diff --git a/setup.py b/setup.py
index 9b2cd73..f042f17 100644
--- a/setup.py
+++ b/setup.py
@@ -1,8 +1,8 @@
 #!/usr/bin/env python
 from setuptools import setup, find_packages
-try:
+try:  # for pip >= 10
     from pip._internal.req import parse_requirements as parse
-except ImportError:
+except ImportError:  # for pip <= 9.0.3
     from pip.req import parse_requirements as parse
 
 requirements = lambda f: [str(i.req) for i in parse(f, session=False)]