diff --git a/CHANGES b/CHANGES
index 77f75a6c5..1167b8de1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -210,6 +210,9 @@ Features added
 Bugs fixed
 ----------
 
+* #3614: Sphinx crashes with requests-2.5.0
+* #3618: autodoc crashes with tupled arguments
+
 Testing
 --------
 
diff --git a/Makefile b/Makefile
index 28a33c8a0..a20df8f39 100644
--- a/Makefile
+++ b/Makefile
@@ -64,6 +64,7 @@ clean-backupfiles:
 
 clean-generated:
 	find . -name '.DS_Store' -exec rm -f {} +
+	rm -rf Sphinx.egg-info/
 	rm -rf doc/_build/
 	rm -f sphinx/pycode/*.pickle
 	rm -f utils/*3.py*
diff --git a/sphinx/ext/autodoc.py b/sphinx/ext/autodoc.py
index 360c13768..58c7317a3 100644
--- a/sphinx/ext/autodoc.py
+++ b/sphinx/ext/autodoc.py
@@ -473,10 +473,19 @@ def formatargspec(function, args, varargs=None, varkw=None, defaults=None,
 
     for i, arg in enumerate(args):
         arg_fd = StringIO()
-        arg_fd.write(format_arg_with_annotation(arg))
-        if defaults and i >= defaults_start:
-            arg_fd.write(' = ' if arg in annotations else '=')
-            arg_fd.write(object_description(defaults[i - defaults_start]))  # type: ignore
+        if isinstance(arg, list):
+            # support tupled arguments list (only for py2): def foo((x, y))
+            arg_fd.write('(')
+            arg_fd.write(format_arg_with_annotation(arg[0]))
+            for param in arg[1:]:
+                arg_fd.write(', ')
+                arg_fd.write(format_arg_with_annotation(param))
+            arg_fd.write(')')
+        else:
+            arg_fd.write(format_arg_with_annotation(arg))
+            if defaults and i >= defaults_start:
+                arg_fd.write(' = ' if arg in annotations else '=')
+                arg_fd.write(object_description(defaults[i - defaults_start]))  # type: ignore
         formatted.append(arg_fd.getvalue())
 
     if varargs:
diff --git a/sphinx/util/requests.py b/sphinx/util/requests.py
index 3b4b7f8b6..09b7a43b1 100644
--- a/sphinx/util/requests.py
+++ b/sphinx/util/requests.py
@@ -36,6 +36,16 @@ except ImportError:
         # for requests < 2.4.0
         InsecureRequestWarning = None
 
+try:
+    from requests.packages.urllib3.exceptions import InsecurePlatformWarning
+except ImportError:
+    try:
+        # for Debian-jessie
+        from urllib3.exceptions import InsecurePlatformWarning
+    except ImportError:
+        # for requests < 2.4.0
+        InsecurePlatformWarning = None
+
 # try to load requests[security] (but only if SSL is available)
 try:
     import ssl
@@ -48,8 +58,8 @@ else:
             pkg_resources.VersionConflict):
         if not getattr(ssl, 'HAS_SNI', False):
             # don't complain on each url processed about the SSL issue
-            requests.packages.urllib3.disable_warnings(
-                requests.packages.urllib3.exceptions.InsecurePlatformWarning)
+            if InsecurePlatformWarning:
+                requests.packages.urllib3.disable_warnings(InsecurePlatformWarning)
             warnings.warn(
                 'Some links may return broken results due to being unable to '
                 'check the Server Name Indication (SNI) in the returned SSL cert '