diff --git a/src/players/Facebook.js b/src/players/Facebook.js
index 047079b..9b1c6d6 100644
--- a/src/players/Facebook.js
+++ b/src/players/Facebook.js
@@ -3,7 +3,7 @@ import React, { Component } from 'react'
 import { callPlayer, getSDK, randomString } from '../utils'
 import createSinglePlayer from '../singlePlayer'
 
-const SDK_URL = '//connect.facebook.net/en_US/sdk.js'
+const SDK_URL = 'https://connect.facebook.net/en_US/sdk.js'
 const SDK_GLOBAL = 'FB'
 const SDK_GLOBAL_READY = 'fbAsyncInit'
 const MATCH_URL = /facebook\.com\/([^/?].+\/)?video(s|\.php)[/?].*$/
diff --git a/src/players/Mixcloud.js b/src/players/Mixcloud.js
index 271e353..d4f3af4 100644
--- a/src/players/Mixcloud.js
+++ b/src/players/Mixcloud.js
@@ -3,7 +3,7 @@ import React, { Component } from 'react'
 import { callPlayer, getSDK, queryString } from '../utils'
 import createSinglePlayer from '../singlePlayer'
 
-const SDK_URL = '//widget.mixcloud.com/media/js/widgetApi.js'
+const SDK_URL = 'https://widget.mixcloud.com/media/js/widgetApi.js'
 const SDK_GLOBAL = 'Mixcloud'
 const MATCH_URL = /mixcloud\.com\/([^/]+\/[^/]+)/
 
diff --git a/src/players/Streamable.js b/src/players/Streamable.js
index 3db0d72..78a5635 100644
--- a/src/players/Streamable.js
+++ b/src/players/Streamable.js
@@ -3,7 +3,7 @@ import React, { Component } from 'react'
 import { callPlayer, getSDK } from '../utils'
 import createSinglePlayer from '../singlePlayer'
 
-const SDK_URL = '//cdn.embed.ly/player-0.1.0.min.js'
+const SDK_URL = 'https://cdn.embed.ly/player-0.1.0.min.js'
 const SDK_GLOBAL = 'playerjs'
 const MATCH_URL = /streamable\.com\/([a-z0-9]+)$/
 
diff --git a/src/players/Wistia.js b/src/players/Wistia.js
index 9ddef60..7f6b10f 100644
--- a/src/players/Wistia.js
+++ b/src/players/Wistia.js
@@ -3,7 +3,7 @@ import React, { Component } from 'react'
 import { callPlayer, getSDK } from '../utils'
 import createSinglePlayer from '../singlePlayer'
 
-const SDK_URL = '//fast.wistia.com/assets/external/E-v1.js'
+const SDK_URL = 'https://fast.wistia.com/assets/external/E-v1.js'
 const SDK_GLOBAL = 'Wistia'
 const MATCH_URL = /(?:wistia\.com|wi\.st)\/(?:medias|embed)\/(.*)$/