diff --git a/packages/metro-bundler/src/JSTransformer/__tests__/Transformer-test.js b/packages/metro-bundler/src/JSTransformer/__tests__/Transformer-test.js
index fc334f79..ae9bcf32 100644
--- a/packages/metro-bundler/src/JSTransformer/__tests__/Transformer-test.js
+++ b/packages/metro-bundler/src/JSTransformer/__tests__/Transformer-test.js
@@ -10,7 +10,7 @@
 
 jest
   .unmock('stream')
-  .unmock('imurmurhash')
+  .unmock('crypto')
   .unmock('../../lib/ModuleTransport')
   .unmock('../');
 
diff --git a/packages/metro-bundler/src/lib/__mocks__/TransformCache.js b/packages/metro-bundler/src/lib/__mocks__/TransformCache.js
index 1fd2261b..f7cc9bb2 100644
--- a/packages/metro-bundler/src/lib/__mocks__/TransformCache.js
+++ b/packages/metro-bundler/src/lib/__mocks__/TransformCache.js
@@ -9,7 +9,7 @@
 
 'use strict';
 
-const imurmurhash = require('imurmurhash');
+const crypto = require('crypto');
 const jsonStableStringify = require('json-stable-stringify');
 
 const transformCache = new Map();
@@ -23,10 +23,11 @@ const mock = {
 };
 
 const transformCacheKeyOf = props =>
-  props.filePath + '-' + imurmurhash(props.sourceCode)
-    .hash(props.getTransformCacheKey(props.sourceCode, props.filePath, props.transformOptions))
-    .hash(jsonStableStringify(props.transformOptions || {}))
-    .result().toString(16);
+  props.filePath + '-' + crypto.createHash('md5')
+    .update(props.sourceCode)
+    .update(props.getTransformCacheKey(props.sourceCode, props.filePath, props.transformOptions))
+    .update(jsonStableStringify(props.transformOptions || {}))
+    .digest('hex');
 
 function writeSync(props) {
   transformCache.set(transformCacheKeyOf(props), props.result);
diff --git a/packages/metro-bundler/src/lib/__tests__/TransformCache-test.js b/packages/metro-bundler/src/lib/__tests__/TransformCache-test.js
index af123ecb..2230e9b0 100644
--- a/packages/metro-bundler/src/lib/__tests__/TransformCache-test.js
+++ b/packages/metro-bundler/src/lib/__tests__/TransformCache-test.js
@@ -10,14 +10,12 @@
 'use strict';
 
 jest
-  .dontMock('imurmurhash')
   .dontMock('json-stable-stringify')
   .dontMock('../TransformCache')
   .dontMock('left-pad')
   .dontMock('lodash/throttle')
   .dontMock('crypto');
 
-const imurmurhash = require('imurmurhash');
 const crypto = require('crypto');
 const jsonStableStringify = require('json-stable-stringify');
 
@@ -73,7 +71,7 @@ describe('TransformCache', () => {
         result: {
           code: `/* result for ${key} */`,
           dependencies: ['foo', `dep of ${key}`],
-          dependencyOffsets: [12, imurmurhash('dep' + key).result()],
+          dependencyOffsets: [12, 34],
           map: {desc: `source map for ${key}`},
         },
       };
@@ -108,7 +106,7 @@ describe('TransformCache', () => {
         result: {
           code: `/* result for ${key} */`,
           dependencies: ['foo', 'bar'],
-          dependencyOffsets: [12, imurmurhash('dep' + key).result()],
+          dependencyOffsets: [12, 34],
           map: {desc: `source map for ${key}`},
         },
       };
diff --git a/packages/metro-bundler/src/node-haste/__tests__/Module-test.js b/packages/metro-bundler/src/node-haste/__tests__/Module-test.js
index e4aca77e..4500631a 100644
--- a/packages/metro-bundler/src/node-haste/__tests__/Module-test.js
+++ b/packages/metro-bundler/src/node-haste/__tests__/Module-test.js
@@ -11,7 +11,7 @@
 jest
   .dontMock('absolute-path')
   .dontMock('json-stable-stringify')
-  .dontMock('imurmurhash')
+  .dontMock('crypto')
   .dontMock('../lib/replacePatterns')
   .dontMock('../DependencyGraph/docblock')
   .dontMock('../Module');