diff --git a/optional-requirements.txt b/optional-requirements.txt
index eb67f59b..4273ec24 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -1,15 +1,15 @@
 # GDrive Integration
 gevent>20.6.0,<21.2.0
-greenlet>=0.4.17,<1.1.0
-httplib2>=0.9.2,<0.18.0
+greenlet>=0.4.17,<1.2.0
+httplib2>=0.9.2,<0.20.0
 oauth2client>=4.0.0,<4.1.4
 uritemplate>=3.0.0,<3.1.0
 pyasn1-modules>=0.0.8,<0.3.0
 pyasn1>=0.1.9,<0.5.0
-PyDrive2>=1.3.1,<1.8.0
+PyDrive2>=1.3.1,<1.9.0
 PyYAML>=3.12
-rsa>=3.4.2,<4.1.0
-six>=1.10.0,<1.15.0
+rsa>=3.4.2,<4.8.0
+six>=1.10.0,<1.17.0
 
 # Gdrive and Gmail integration
 google-api-python-client>=1.7.11,<2.1.0
@@ -26,7 +26,7 @@ python-ldap>=3.0.0,<3.4.0
 Flask-SimpleLDAP>=1.4.0,<1.5.0
 
 #oauth
-Flask-Dance>=1.4.0,<4.1.0
+Flask-Dance>=2.0.0,<5.1.0
 SQLAlchemy-Utils>=0.33.5,<0.38.0
 
 # extracting metadata
@@ -34,7 +34,7 @@ lxml>=3.8.0,<4.7.0
 rarfile>=2.7
 
 # other
-natsort>=2.2.0,<7.1.0
+natsort>=2.2.0,<7.2.0
 comicapi>= 2.2.0,<2.3.0
 
 #Kobo integration
diff --git a/requirements.txt b/requirements.txt
index 8f273296..b29d3b99 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,14 +1,14 @@
-Babel>=1.3, <2.9
+Babel>=1.3, <3.0
 Flask-Babel>=0.11.1,<2.1.0
 Flask-Login>=0.3.2,<0.5.1
 Flask-Principal>=0.3.2,<0.5.1
 backports_abc>=0.4
-Flask>=1.0.2,<1.2.0
+Flask>=1.0.2,<2.1.0
 iso-639>=0.4.5,<0.5.0
 PyPDF3>=1.0.0,<1.0.4
 pytz>=2016.10
 requests>=2.11.1,<2.25.0
-SQLAlchemy>=1.3.0,<1.4.0    # oauth fails on 1.4+ due to import problems in flask_dance
+SQLAlchemy>=1.3.0,<1.5.0
 tornado>=4.1,<6.2
 Wand>=0.4.4,<0.7.0
-unidecode>=0.04.19,<1.2.0
+unidecode>=0.04.19,<1.3.0
diff --git a/setup.cfg b/setup.cfg
index 8266391c..23c4e60b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -34,35 +34,38 @@ console_scripts =
 [options]
 include_package_data = True
 install_requires =
-    Babel>=1.3, <2.9
+    Babel>=1.3, <3.0
     Flask-Babel>=0.11.1,<2.1.0
     Flask-Login>=0.3.2,<0.5.1
     Flask-Principal>=0.3.2,<0.5.1
     backports_abc>=0.4
-    Flask>=1.0.2,<1.2.0
+    Flask>=1.0.2,<2.1.0
     iso-639>=0.4.5,<0.5.0
     PyPDF3>=1.0.0,<1.0.4
     pytz>=2016.10
     requests>=2.11.1,<2.25.0
-    SQLAlchemy>=1.3.0,<1.4.0
+    SQLAlchemy>=1.3.0,<1.5.0
     tornado>=4.1,<6.2
     Wand>=0.4.4,<0.7.0
-    unidecode>=0.04.19,<1.2.0
+    unidecode>=0.04.19,<1.3.0
 
 [options.extras_require]
 gdrive =
-    google-api-python-client>=1.7.11,<1.13.0
+    google-api-python-client>=1.7.11,<2.1.0
     gevent>20.6.0,<21.2.0
-    greenlet>=0.4.17,<1.1.0
-    httplib2>=0.9.2,<0.18.0
+    greenlet>=0.4.17,<1.2.0
+    httplib2>=0.9.2,<0.20.0
     oauth2client>=4.0.0,<4.1.4
     uritemplate>=3.0.0,<3.1.0
     pyasn1-modules>=0.0.8,<0.3.0
     pyasn1>=0.1.9,<0.5.0
-    PyDrive2>=1.3.1,<1.8.0
+    PyDrive2>=1.3.1,<1.9.0
     PyYAML>=3.12
-    rsa>=3.4.2,<4.1.0
-    six>=1.10.0,<1.15.0
+    rsa>=3.4.2,<4.8.0
+    six>=1.10.0,<1.17.0
+gmail =
+    google-auth-oauthlib>=0.4.3,<0.5.0
+    google-api-python-client>=1.7.11,<2.1.0
 goodreads =
     goodreads>=0.3.2,<0.4.0
     python-Levenshtein>=0.12.0,<0.13.0
@@ -70,14 +73,14 @@ ldap =
     python-ldap>=3.0.0,<3.4.0
     Flask-SimpleLDAP>=1.4.0,<1.5.0
 oauth =
-    Flask-Dance>=1.4.0,<3.1.0
-    SQLAlchemy-Utils>=0.33.5,<0.37.0
+    Flask-Dance>=2.0.0,<5.1.0
+    SQLAlchemy-Utils>=0.33.5,<0.38.0
 metadata =
     lxml>=3.8.0,<4.7.0
     rarfile>=2.7
 comics =
-    natsort>=2.2.0,<7.1.0
-    comicapi>= 2.1.3,<2.2.0
+    natsort>=2.2.0,<7.2.0
+    comicapi>= 2.2.0,<2.3.0
 kobo =
     jsonschema>=3.2.0,<3.3.0