diff --git a/.travis.yml b/.travis.yml
index 32dd4b86..ff6b984c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,8 +13,10 @@ matrix:
        python: 3.7
        dist: xenial
        sudo: true # required workaround for https://github.com/travis-ci/travis-ci/issues/9815
-    -  env: TOXENV=pypy
+    -  env: TOXENV=pypy2
        python: pypy
+    -  env: TOXENV=pypy
+       python: pypy3
     -  env: TOXENV=pre-commit
        python: 3.6
     -  env: TOXENV=mypy
diff --git a/docs/conf.py b/docs/conf.py
index 0e34c364..2d03a046 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -60,9 +60,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = "0.1"
+version = "2.3"
 # The full version, including alpha/beta/rc tags.
-release = "0.1a0"
+release = "2.3.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/graphql/__init__.py b/graphql/__init__.py
index 902800b3..e846b04d 100644
--- a/graphql/__init__.py
+++ b/graphql/__init__.py
@@ -168,7 +168,7 @@
     set_default_backend,
 )
 
-VERSION = (2, 2, 1, "final", 0)
+VERSION = (2, 3, 0, "final", 0)
 __version__ = get_version(VERSION)
 
 
diff --git a/graphql/backend/compiled.py b/graphql/backend/compiled.py
index e3805cd1..91183f77 100644
--- a/graphql/backend/compiled.py
+++ b/graphql/backend/compiled.py
@@ -47,9 +47,9 @@ def _from_namespace(cls, schema, namespace):
         execute = namespace["execute"]  # type: Callable
 
         namespace["schema"] = schema
-        return cls(  # type: ignore
+        return cls(
             schema=schema,
             document_string=document_string,
-            document_ast=document_ast,
+            document_ast=document_ast,  # type: ignore
             execute=execute,
         )
diff --git a/graphql/execution/executor.py b/graphql/execution/executor.py
index 92da197a..6c7fa9c3 100644
--- a/graphql/execution/executor.py
+++ b/graphql/execution/executor.py
@@ -530,7 +530,9 @@ def complete_value(
                 exe_context, return_type, field_asts, info, path, resolved
             ),
             lambda error: Promise.rejected(  # type: ignore
-                GraphQLLocatedError(field_asts, original_error=error, path=path)
+                GraphQLLocatedError(  # type: ignore
+                    field_asts, original_error=error, path=path
+                )
             ),
         )
 
@@ -602,8 +604,10 @@ def complete_list_value(
         completed_results.append(completed_item)
         index += 1
 
-    return (  # type: ignore
-        Promise.all(completed_results) if contains_promise else completed_results
+    return (
+        Promise.all(completed_results)  # type: ignore
+        if contains_promise
+        else completed_results
     )
 
 
diff --git a/graphql/language/parser.py b/graphql/language/parser.py
index 61571858..f9f8ea95 100644
--- a/graphql/language/parser.py
+++ b/graphql/language/parser.py
@@ -476,33 +476,33 @@ def parse_value_literal(parser, is_const):
 
     elif token.kind == TokenKind.INT:
         advance(parser)
-        return ast.IntValue(  # type: ignore
-            value=token.value, loc=loc(parser, token.start)
+        return ast.IntValue(
+            value=token.value, loc=loc(parser, token.start)  # type: ignore
         )
 
     elif token.kind == TokenKind.FLOAT:
         advance(parser)
-        return ast.FloatValue(  # type: ignore
-            value=token.value, loc=loc(parser, token.start)
+        return ast.FloatValue(
+            value=token.value, loc=loc(parser, token.start)  # type: ignore
         )
 
     elif token.kind == TokenKind.STRING:
         advance(parser)
-        return ast.StringValue(  # type: ignore
-            value=token.value, loc=loc(parser, token.start)
+        return ast.StringValue(
+            value=token.value, loc=loc(parser, token.start)  # type: ignore
         )
 
     elif token.kind == TokenKind.NAME:
         if token.value in ("true", "false"):
             advance(parser)
-            return ast.BooleanValue(  # type: ignore
+            return ast.BooleanValue(
                 value=token.value == "true", loc=loc(parser, token.start)
             )
 
         if token.value != "null":
             advance(parser)
-            return ast.EnumValue(  # type: ignore
-                value=token.value, loc=loc(parser, token.start)
+            return ast.EnumValue(
+                value=token.value, loc=loc(parser, token.start)  # type: ignore
             )
 
     elif token.kind == TokenKind.DOLLAR:
@@ -728,10 +728,10 @@ def parse_field_definition(parser):
     # type: (Parser) -> FieldDefinition
     start = parser.token.start
 
-    return ast.FieldDefinition(  # type: ignore
+    return ast.FieldDefinition(
         name=parse_name(parser),
         arguments=parse_argument_defs(parser),
-        type=expect(parser, TokenKind.COLON) and parse_type(parser),
+        type=expect(parser, TokenKind.COLON) and parse_type(parser),  # type: ignore
         directives=parse_directives(parser),
         loc=loc(parser, start),
     )
@@ -749,9 +749,9 @@ def parse_input_value_def(parser):
     # type: (Parser) -> InputValueDefinition
     start = parser.token.start
 
-    return ast.InputValueDefinition(  # type: ignore
+    return ast.InputValueDefinition(
         name=parse_name(parser),
-        type=expect(parser, TokenKind.COLON) and parse_type(parser),
+        type=expect(parser, TokenKind.COLON) and parse_type(parser),  # type: ignore
         default_value=parse_const_value(parser)
         if skip(parser, TokenKind.EQUALS)
         else None,
@@ -780,10 +780,11 @@ def parse_union_type_definition(parser):
     start = parser.token.start
     expect_keyword(parser, "union")
 
-    return ast.UnionTypeDefinition(  # type: ignore
+    return ast.UnionTypeDefinition(
         name=parse_name(parser),
         directives=parse_directives(parser),
-        types=expect(parser, TokenKind.EQUALS) and parse_union_members(parser),
+        types=expect(parser, TokenKind.EQUALS)  # type: ignore
+        and parse_union_members(parser),
         loc=loc(parser, start),
     )
 
diff --git a/graphql/language/visitor.py b/graphql/language/visitor.py
index 42b1a2c9..a3c3ff93 100644
--- a/graphql/language/visitor.py
+++ b/graphql/language/visitor.py
@@ -148,8 +148,8 @@ def visit(root, visitor, key_map=None):
         if not is_leaving:
             stack = Stack(in_array, index, keys, edits, stack)
             in_array = isinstance(node, list)
-            keys = (  # type: ignore
-                node
+            keys = (
+                node  # type: ignore
                 if in_array
                 else visitor_keys.get(type(node), None) or []  # type: ignore
             )
diff --git a/graphql/validation/rules/overlapping_fields_can_be_merged.py b/graphql/validation/rules/overlapping_fields_can_be_merged.py
index f8b01e20..3e337d47 100644
--- a/graphql/validation/rules/overlapping_fields_can_be_merged.py
+++ b/graphql/validation/rules/overlapping_fields_can_be_merged.py
@@ -621,12 +621,15 @@ def _get_referenced_fields_and_fragment_names(
     if cached:
         return cached
 
-    fragment_type = type_from_ast(  # type: ignore
-        context.get_schema(), fragment.type_condition
+    fragment_type = type_from_ast(
+        context.get_schema(), fragment.type_condition  # type: ignore
     )
 
-    return _get_fields_and_fragments_names(  # type: ignore
-        context, cached_fields_and_fragment_names, fragment_type, fragment.selection_set
+    return _get_fields_and_fragments_names(
+        context,
+        cached_fields_and_fragment_names,
+        fragment_type,  # type: ignore
+        fragment.selection_set,
     )
 
 
@@ -659,15 +662,15 @@ def _collect_fields_and_fragment_names(
         elif isinstance(selection, ast.InlineFragment):
             type_condition = selection.type_condition
             if type_condition:
-                inline_fragment_type = type_from_ast(  # type: ignore
-                    context.get_schema(), selection.type_condition
+                inline_fragment_type = type_from_ast(
+                    context.get_schema(), selection.type_condition  # type: ignore
                 )
             else:
                 inline_fragment_type = parent_type  # type: ignore
 
-            _collect_fields_and_fragment_names(  # type: ignore
+            _collect_fields_and_fragment_names(
                 context,
-                inline_fragment_type,
+                inline_fragment_type,  # type: ignore
                 selection.selection_set,
                 ast_and_defs,
                 fragment_names,
@@ -683,8 +686,8 @@ def _subfield_conflicts(
     # type: (...) -> Optional[Tuple[Tuple[str, str], List[Node], List[Node]]]
     """Given a series of Conflicts which occurred between two sub-fields, generate a single Conflict."""
     if conflicts:
-        return (  # type: ignore
-            (response_name, [conflict[0] for conflict in conflicts]),
+        return (
+            (response_name, [conflict[0] for conflict in conflicts]),  # type: ignore
             tuple(itertools.chain([ast1], *[conflict[1] for conflict in conflicts])),
             tuple(itertools.chain([ast2], *[conflict[2] for conflict in conflicts])),
         )
diff --git a/setup.py b/setup.py
index d705d06c..b0095af5 100644
--- a/setup.py
+++ b/setup.py
@@ -21,14 +21,14 @@
 
 sys.path[:] = path_copy
 
-install_requires = ["six>=1.10.0", "promise>=2.3", "rx>=1.6,<3"]
+install_requires = ["six>=1.10.0", "promise>=2.3,<3", "rx>=1.6,<2"]
 
 tests_requires = [
-    "pytest>=3.3,<4.0",
+    "pytest==3.10.1",
     "pytest-django==2.9.1",
     "pytest-cov==2.3.1",
-    "coveralls",
-    "gevent>=1.1",
+    "coveralls==1.10.0",
+    "gevent==1.4.0",
     "six>=1.10.0",
     "pytest-benchmark==3.0.0",
     "pytest-mock==1.2",
@@ -67,7 +67,6 @@ def run_tests(self):
         "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
diff --git a/tox.ini b/tox.ini
index bdeeef17..84171501 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,26 +1,26 @@
 [tox]
-envlist = py{27,34,35,36,37,py},pre-commit,mypy,docs
+envlist = py{27,35,36,37,py,py3},pre-commit,mypy,docs
 
 [testenv]
 deps =
     .[test]
 commands =
-    py{27,34,py}: py.test graphql tests {posargs}
-    py{35,36,37}: py.test graphql tests tests_py35 {posargs}
+    py{27,py}: py.test graphql tests {posargs}
+    py{35,36,37,py3}: py.test graphql tests tests_py35 {posargs}
 
 [testenv:pre-commit]
-basepython=python3.6
+basepython=python3.7
 deps =
-    pre-commit>0.12.0
+    pre-commit==1.21.0
 setenv =
     LC_CTYPE=en_US.UTF-8
 commands =
     pre-commit {posargs:run --all-files}
 
 [testenv:mypy]
-basepython=python3.6
+basepython=python3.7
 deps =
-    mypy==0.720
+    mypy==0.761
 commands =
     mypy graphql --ignore-missing-imports