diff --git a/.flowconfig b/.flowconfig
index 7eec6f416..206069d0d 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -41,12 +41,12 @@ suppress_type=$FlowIssue
 suppress_type=$FlowFixMe
 suppress_type=$FixMe
 
-suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(4[0-3]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native_oss[a-z,_]*\\)?)\\)
-suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(4[0-3]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native_oss[a-z,_]*\\)?)\\)?:? #[0-9]+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(4[0-4]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native_oss[a-z,_]*\\)?)\\)
+suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(4[0-4]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native_oss[a-z,_]*\\)?)\\)?:? #[0-9]+
 suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 unsafe.enable_getters_and_setters=true
 
 [version]
-^0.43.1
+^0.44.0
diff --git a/Libraries/Lists/MetroListView.js b/Libraries/Lists/MetroListView.js
index 125c60584..96f04ca22 100644
--- a/Libraries/Lists/MetroListView.js
+++ b/Libraries/Lists/MetroListView.js
@@ -28,6 +28,7 @@ type NormalProps = {
 
   // Provide either `items` or `sections`
   items?: ?Array<Item>, // By default, an Item is assumed to be {key: string}
+  // $FlowFixMe - Something is a little off with the type Array<Item>
   sections?: ?Array<{key: string, data: Array<Item>}>,
 
   /**
@@ -39,10 +40,16 @@ type NormalProps = {
    * Set this true while waiting for new data from a refresh.
    */
   refreshing?: boolean,
+  /**
+   * If true, renders items next to each other horizontally instead of stacked vertically.
+   */
+  horizontal?: ?boolean,
 };
 type DefaultProps = {
-  keyExtractor: (item: Item) => string,
+  keyExtractor: (item: Item, index: number) => string,
 };
+/* $FlowFixMe - the renderItem passed in from SectionList is optional there but
+ * required here */
 type Props = NormalProps & DefaultProps;
 
 /**
@@ -74,7 +81,7 @@ class MetroListView extends React.Component {
     return this._listRef;
   }
   static defaultProps: DefaultProps = {
-    keyExtractor: (item, index) => item.key || index,
+    keyExtractor: (item, index) => item.key || String(index),
     renderScrollComponent: (props: Props) => {
       if (props.onRefresh) {
         return (
diff --git a/Libraries/Lists/SectionList.js b/Libraries/Lists/SectionList.js
index 0643994d2..757714678 100644
--- a/Libraries/Lists/SectionList.js
+++ b/Libraries/Lists/SectionList.js
@@ -156,6 +156,8 @@ type OptionalProps<SectionT: SectionBase<any>> = {
    * enabled by default on iOS because that is the platform standard there.
    */
   stickySectionHeadersEnabled?: boolean,
+
+  legacyImplementation?: ?boolean,
 };
 
 type Props<SectionT> = RequiredProps<SectionT>
diff --git a/Libraries/Lists/VirtualizedList.js b/Libraries/Lists/VirtualizedList.js
index 2a909e1c8..16a8b5f9d 100644
--- a/Libraries/Lists/VirtualizedList.js
+++ b/Libraries/Lists/VirtualizedList.js
@@ -134,6 +134,8 @@ type OptionalProps = {
    */
   windowSize: number,
 };
+/* $FlowFixMe - this Props seems to be missing a bunch of stuff. Remove this
+ * comment to see the errors */
 export type Props = RequiredProps & OptionalProps;
 
 let _usedIndexForKey = false;
diff --git a/local-cli/templates/HelloWorld/_flowconfig b/local-cli/templates/HelloWorld/_flowconfig
index fdac4d6d7..7c4a432ca 100644
--- a/local-cli/templates/HelloWorld/_flowconfig
+++ b/local-cli/templates/HelloWorld/_flowconfig
@@ -36,12 +36,12 @@ suppress_type=$FlowIssue
 suppress_type=$FlowFixMe
 suppress_type=$FixMe
 
-suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(4[0-3]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)
-suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(4[0-3]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)?:? #[0-9]+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(4[0-4]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)
+suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(4[0-4]\\|[1-3][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native[a-z,_]*\\)?)\\)?:? #[0-9]+
 suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 unsafe.enable_getters_and_setters=true
 
 [version]
-^0.43.1
+^0.44.0
diff --git a/package.json b/package.json
index 30a5fb051..d57918e8d 100644
--- a/package.json
+++ b/package.json
@@ -221,7 +221,7 @@
     "eslint-plugin-flowtype": "^2.20.0",
     "eslint-plugin-react": "^6.4.1",
     "eslint-config-fbjs": "^1.1.1",
-    "flow-bin": "^0.43.1",
+    "flow-bin": "^0.44.0",
     "jest": "19.0.2",
     "jest-repl": "19.0.2",
     "jest-runtime": "19.0.2",