diff --git a/.flowconfig b/.flowconfig
index f9c05b6bff..3a7560f6ca 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -10,3 +10,6 @@
 
 [options]
 experimental.const_params=true
+
+[version]
+^0.54.0
diff --git a/package.json b/package.json
index 08aa05163f..2d0ac08b79 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
     "eslint": "4.4.1",
     "eslint-plugin-babel": "4.1.2",
     "eslint-plugin-flowtype": "2.35.0",
-    "flow-bin": "0.52.0",
+    "flow-bin": "^0.54.0",
     "isparta": "4.0.0",
     "mocha": "3.5.0",
     "sane": "2.0.0"
diff --git a/src/subscription/__tests__/eventEmitterAsyncIterator.js b/src/subscription/__tests__/eventEmitterAsyncIterator.js
index 8fe45a4ec3..0f6fb95ec1 100644
--- a/src/subscription/__tests__/eventEmitterAsyncIterator.js
+++ b/src/subscription/__tests__/eventEmitterAsyncIterator.js
@@ -53,7 +53,9 @@ export default function eventEmitterAsyncIterator(
     }
   }
 
-  return {
+  /* TODO: Flow doesn't support symbols as keys:
+     https://github.com/facebook/flow/issues/3258 */
+  return ({
     next() {
       return listening ? pullValue() : this.return();
     },
@@ -68,5 +70,5 @@ export default function eventEmitterAsyncIterator(
     [$$asyncIterator]() {
       return this;
     },
-  };
+  }: any);
 }
diff --git a/src/subscription/asyncIteratorReject.js b/src/subscription/asyncIteratorReject.js
index 85f0881167..4aac773fdd 100644
--- a/src/subscription/asyncIteratorReject.js
+++ b/src/subscription/asyncIteratorReject.js
@@ -18,7 +18,9 @@ import { $$asyncIterator } from 'iterall';
  */
 export default function asyncIteratorReject(error: Error): AsyncIterator<void> {
   let isComplete = false;
-  return {
+  /* TODO: Flow doesn't support symbols as keys:
+     https://github.com/facebook/flow/issues/3258 */
+  return ({
     next() {
       const result = isComplete ?
         Promise.resolve({ value: undefined, done: true }) :
@@ -37,5 +39,5 @@ export default function asyncIteratorReject(error: Error): AsyncIterator<void> {
     [$$asyncIterator]() {
       return this;
     },
-  };
+  }: any);
 }
diff --git a/src/subscription/mapAsyncIterator.js b/src/subscription/mapAsyncIterator.js
index 5b66eff2b0..c31d74c6cd 100644
--- a/src/subscription/mapAsyncIterator.js
+++ b/src/subscription/mapAsyncIterator.js
@@ -45,7 +45,9 @@ export default function mapAsyncIterator<T, U>(
       asyncMapValue(error, reject).then(iteratorResult, abruptClose);
   }
 
-  return {
+  /* TODO: Flow doesn't support symbols as keys:
+     https://github.com/facebook/flow/issues/3258 */
+  return ({
     next() {
       return iterator.next().then(mapResult, mapReject);
     },
@@ -63,7 +65,7 @@ export default function mapAsyncIterator<T, U>(
     [$$asyncIterator]() {
       return this;
     },
-  };
+  }: any);
 }
 
 function asyncMapValue<T, U>(
diff --git a/src/type/definition.js b/src/type/definition.js
index 17c3c16e87..5aa4b9f1ee 100644
--- a/src/type/definition.js
+++ b/src/type/definition.js
@@ -70,17 +70,18 @@ export function assertType(type: mixed): GraphQLType {
 /**
  * These types may be used as input types for arguments and directives.
  */
-export type GraphQLInputType =
+type GraphQLInputType_<T> =
   GraphQLScalarType |
   GraphQLEnumType |
   GraphQLInputObjectType |
-  GraphQLList<GraphQLInputType> |
+  GraphQLList<T> |
   GraphQLNonNull<
     GraphQLScalarType |
     GraphQLEnumType |
     GraphQLInputObjectType |
-    GraphQLList<GraphQLInputType>
+    GraphQLList<T>
   >;
+export type GraphQLInputType = GraphQLInputType_<*>;
 
 export function isInputType(type: ?GraphQLType): boolean %checks {
   return (
@@ -210,14 +211,15 @@ export function assertAbstractType(type: ?GraphQLType): GraphQLAbstractType {
 /**
  * These types can all accept null as a value.
  */
-export type GraphQLNullableType =
+type GraphQLNullableType_<T> =
   GraphQLScalarType |
   GraphQLObjectType |
   GraphQLInterfaceType |
   GraphQLUnionType |
   GraphQLEnumType |
   GraphQLInputObjectType |
-  GraphQLList<*>;
+  GraphQLList<T>;
+export type GraphQLNullableType = GraphQLNullableType_<*>;
 
 export function getNullableType<T: GraphQLType>(
   type: ?T
diff --git a/yarn.lock b/yarn.lock
index fa41a46677..7f33a88ddb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1224,9 +1224,9 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flow-bin@0.52.0:
-  version "0.52.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.52.0.tgz#b6d9abe8bcd1ee5c62df386451a4e2553cadc3a3"
+flow-bin@^0.54.0:
+  version "0.54.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.54.0.tgz#f2fb0478e9e99702b623c9ed84079a39903bba77"
 
 for-in@^1.0.1:
   version "1.0.2"
@@ -1332,7 +1332,7 @@ glob-parent@^2.0.0:
   dependencies:
     is-glob "^2.0.0"
 
-glob@7.1.1, glob@^7.0.0, glob@^7.0.5:
+glob@7.1.1, glob@^7.0.0:
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.1.tgz#805211df04faaf1c63a3600306cdf5ade50b2ec8"
   dependencies:
@@ -1353,7 +1353,7 @@ glob@^5.0.15:
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
-glob@^7.0.3, glob@^7.1.2:
+glob@^7.0.3, glob@^7.0.5, glob@^7.1.2:
   version "7.1.2"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
   dependencies:
@@ -1691,14 +1691,14 @@ js-tokens@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.1.tgz#08e9f132484a2c45a30907e9dc4d5567b7f114d7"
 
-js-yaml@3.6.1, js-yaml@3.x:
+js-yaml@3.6.1:
   version "3.6.1"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.6.1.tgz#6e5fe67d8b205ce4d22fad05b7781e8dadcc4b30"
   dependencies:
     argparse "^1.0.7"
     esprima "^2.6.0"
 
-js-yaml@^3.9.1:
+js-yaml@3.x, js-yaml@^3.9.1:
   version "3.9.1"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.9.1.tgz#08775cebdfdd359209f0d2acd383c8f86a6904a0"
   dependencies: