diff --git a/VAST 4.1 Samples/Ad_Verification-test.xml b/VAST 4.1 Samples/Ad_Verification-test.xml
index 543566d..e59357a 100644
--- a/VAST 4.1 Samples/Ad_Verification-test.xml	
+++ b/VAST 4.1 Samples/Ad_Verification-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20001" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Audio_DAAST_Sample.xml b/VAST 4.1 Samples/Audio_DAAST_Sample.xml
index 02e24d5..ac97982 100644
--- a/VAST 4.1 Samples/Audio_DAAST_Sample.xml	
+++ b/VAST 4.1 Samples/Audio_DAAST_Sample.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20007" sequence="1" conditionalAd="false" adType="audio">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Category-test.xml b/VAST 4.1 Samples/Category-test.xml
index f28cc42..99378b5 100644
--- a/VAST 4.1 Samples/Category-test.xml	
+++ b/VAST 4.1 Samples/Category-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20008" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Closed_Caption_Test.xml b/VAST 4.1 Samples/Closed_Caption_Test.xml
new file mode 100644
index 0000000..c46dc7f
--- /dev/null
+++ b/VAST 4.1 Samples/Closed_Caption_Test.xml	
@@ -0,0 +1,67 @@
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+  <Ad id="20001" sequence="1" conditionalAd="false">
+    <InLine>
+      <AdSystem version="4.0">iabtechlab</AdSystem>
+      <Error>http://example.com/error</Error>
+      <Extensions>
+        <Extension type="iab-Count">
+          <total_available>
+            <![CDATA[ 2 ]]>
+          </total_available>
+        </Extension>
+      </Extensions>
+      <Impression id="Impression-ID">http://example.com/track/impression</Impression>
+      <Pricing model="cpm" currency="USD">
+        <![CDATA[ 25.00 ]]>
+      </Pricing>
+      <AdServingId>ADID_INLINEARTEST_ABC123</AdServingId>
+      <AdTitle>iabtechlab video ad</AdTitle>
+      <Creatives>
+        <Creative id="5480" sequence="1" adId="2447226">
+          <UniversalAdId idRegistry="Ad-ID" idValue="8465">8465</UniversalAdId>
+          <Linear>
+            <TrackingEvents>
+              <Tracking event="start" offset="09:15:23">http://example.com/tracking/start</Tracking>
+              <Tracking event="firstQuartile">http://example.com/tracking/firstQuartile</Tracking>
+              <Tracking event="midpoint">http://example.com/tracking/midpoint</Tracking>
+              <Tracking event="thirdQuartile">http://example.com/tracking/thirdQuartile</Tracking>
+              <Tracking event="complete">http://example.com/tracking/complete</Tracking>
+            </TrackingEvents>
+            <VideoClicks>
+              <ClickThrough id="blog">
+                <![CDATA[https://iabtechlab.com]]>
+              </ClickThrough>
+            </VideoClicks>
+            <Duration>00:00:16</Duration>
+            <MediaFiles>
+				<ClosedCaptionFiles>
+					<ClosedCaptionFile type="text/srt"  language="en">   
+					 <![CDATA[https://mycdn.example.com/creatives/creative001.srt]]>
+					</ClosedCaptionFile>
+					<ClosedCaptionFile type="text/srt" language="fr">   
+					 <![CDATA[https://mycdn.example.com/creatives/creative001-1.srt]]>
+					</ClosedCaptionFile>
+					<ClosedCaptionFile type="text/vtt"   language="zh-TW">   
+					 <![CDATA[https://mycdn.example.com/creatives/creative001.vtt]]>
+					</ClosedCaptionFile>
+					<ClosedCaptionFile type="application/ttml+xml"  language="zh-CH">   
+					 <![CDATA[https://mycdn.example.com/creatives/creative001.ttml]]>
+					</ClosedCaptionFile>
+				</ClosedCaptionFiles>
+
+              <MediaFile id="5241" delivery="progressive" type="video/mp4" bitrate="2000" width="1280" height="720" minBitrate="1500" maxBitrate="2500" scalable="1" maintainAspectRatio="1" codec="0">
+                <![CDATA[https://iabtechlab.com/wp-content/uploads/2016/07/VAST-4.0-Short-Intro.mp4]]>
+              </MediaFile>
+              <MediaFile id="5244" delivery="progressive" type="video/mp4" bitrate="1000" width="854" height="480" minBitrate="700" maxBitrate="1500" scalable="1" maintainAspectRatio="1" codec="0">
+                <![CDATA[https://iabtechlab.com/wp-content/uploads/2017/12/VAST-4.0-Short-Intro-mid-resolution.mp4]]>
+              </MediaFile>
+              <MediaFile id="5246" delivery="progressive" type="video/mp4" bitrate="600" width="640" height="360" minBitrate="500" maxBitrate="700" scalable="1" maintainAspectRatio="1" codec="0">
+                <![CDATA[https://iabtechlab.com/wp-content/uploads/2017/12/VAST-4.0-Short-Intro-low-resolution.mp4]]>
+              </MediaFile>
+            </MediaFiles>
+          </Linear>
+        </Creative>
+      </Creatives>
+    </InLine>
+  </Ad>
+</VAST>
diff --git a/VAST 4.1 Samples/Conditional_Ad-test.xml b/VAST 4.1 Samples/Conditional_Ad-test.xml
index 9a772ae..042e1c0 100644
--- a/VAST 4.1 Samples/Conditional_Ad-test.xml	
+++ b/VAST 4.1 Samples/Conditional_Ad-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20002" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Event_Tracking-test.xml b/VAST 4.1 Samples/Event_Tracking-test.xml
index cdab2f5..a38047f 100644
--- a/VAST 4.1 Samples/Event_Tracking-test.xml	
+++ b/VAST 4.1 Samples/Event_Tracking-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20001" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Inline_Companion_Tag-test.xml b/VAST 4.1 Samples/Inline_Companion_Tag-test.xml
index 5700bd4..0fb0d66 100644
--- a/VAST 4.1 Samples/Inline_Companion_Tag-test.xml	
+++ b/VAST 4.1 Samples/Inline_Companion_Tag-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns="http://www.iab.com/VAST">
   <Ad id="20004" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Inline_Linear_Tag-test.xml b/VAST 4.1 Samples/Inline_Linear_Tag-test.xml
index 1a7a818..d56013c 100644
--- a/VAST 4.1 Samples/Inline_Linear_Tag-test.xml	
+++ b/VAST 4.1 Samples/Inline_Linear_Tag-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20001" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Inline_Non-Linear_Tag-test.xml b/VAST 4.1 Samples/Inline_Non-Linear_Tag-test.xml
index cbfc79f..95fbbb5 100644
--- a/VAST 4.1 Samples/Inline_Non-Linear_Tag-test.xml	
+++ b/VAST 4.1 Samples/Inline_Non-Linear_Tag-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns="http://www.iab.com/VAST">
   <Ad id="20005" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Inline_Simple.xml b/VAST 4.1 Samples/Inline_Simple.xml
index ebd3c7f..a173caa 100644
--- a/VAST 4.1 Samples/Inline_Simple.xml	
+++ b/VAST 4.1 Samples/Inline_Simple.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20001" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/No_Wrapper_Tag-test.xml b/VAST 4.1 Samples/No_Wrapper_Tag-test.xml
index 2bb2c33..e216621 100644
--- a/VAST 4.1 Samples/No_Wrapper_Tag-test.xml	
+++ b/VAST 4.1 Samples/No_Wrapper_Tag-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20001" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Ready_to_serve_Media_Files_check-test.xml b/VAST 4.1 Samples/Ready_to_serve_Media_Files_check-test.xml
index 3cd2098..5a141dd 100644
--- a/VAST 4.1 Samples/Ready_to_serve_Media_Files_check-test.xml	
+++ b/VAST 4.1 Samples/Ready_to_serve_Media_Files_check-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20007" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/eval_SSAI_stitching _VPAID_separation-test.xml b/VAST 4.1 Samples/SSAI_stitching _VPAID_separation-test.xml
similarity index 97%
rename from VAST 4.1 Samples/eval_SSAI_stitching _VPAID_separation-test.xml
rename to VAST 4.1 Samples/SSAI_stitching _VPAID_separation-test.xml
index 2b5a9b1..4f1510b 100644
--- a/VAST 4.1 Samples/eval_SSAI_stitching _VPAID_separation-test.xml	
+++ b/VAST 4.1 Samples/SSAI_stitching _VPAID_separation-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20001" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/eval_SSAI_stitching_mezzanine_file_support-test.xml b/VAST 4.1 Samples/SSAI_stitching_mezzanine_file_support-test.xml
similarity index 97%
rename from VAST 4.1 Samples/eval_SSAI_stitching_mezzanine_file_support-test.xml
rename to VAST 4.1 Samples/SSAI_stitching_mezzanine_file_support-test.xml
index 63b80a8..f43d1c1 100644
--- a/VAST 4.1 Samples/eval_SSAI_stitching_mezzanine_file_support-test.xml	
+++ b/VAST 4.1 Samples/SSAI_stitching_mezzanine_file_support-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20001" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Universal_Ad_ID-test.xml b/VAST 4.1 Samples/Universal_Ad_ID-test.xml
index 9859abb..d957fb5 100644
--- a/VAST 4.1 Samples/Universal_Ad_ID-test.xml	
+++ b/VAST 4.1 Samples/Universal_Ad_ID-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20008" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Video_Clicks_and_click_tracking-Inline-test.xml b/VAST 4.1 Samples/Video_Clicks_and_click_tracking-Inline-test.xml
index c993f06..61b3e44 100644
--- a/VAST 4.1 Samples/Video_Clicks_and_click_tracking-Inline-test.xml	
+++ b/VAST 4.1 Samples/Video_Clicks_and_click_tracking-Inline-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.iab.com/VAST">
   <Ad id="20009" sequence="1" conditionalAd="false">
     <InLine>
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Viewable_Impression-test.xml b/VAST 4.1 Samples/Viewable_Impression-test.xml
index 8184bf0..08b4d7c 100644
--- a/VAST 4.1 Samples/Viewable_Impression-test.xml	
+++ b/VAST 4.1 Samples/Viewable_Impression-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns="http://www.iab.com/VAST">
   <Ad id="20010" sequence="1" conditionalAd="false">
     <Wrapper followAdditionalWrappers="0" allowMultipleAds="1" fallbackOnNoAd="0">
       <AdSystem version="4.0">iabtechlab</AdSystem>
diff --git a/VAST 4.1 Samples/Wrapper_Tag-test.xml b/VAST 4.1 Samples/Wrapper_Tag-test.xml
index 3d555f7..203e11d 100644
--- a/VAST 4.1 Samples/Wrapper_Tag-test.xml	
+++ b/VAST 4.1 Samples/Wrapper_Tag-test.xml	
@@ -1,4 +1,4 @@
-<VAST version="4.0" xmlns="http://www.iab.com/VAST">
+<VAST version="4.1" xmlns="http://www.iab.com/VAST">
   <Ad id="20011" sequence="1" conditionalAd="false">
     <Wrapper followAdditionalWrappers="0" allowMultipleAds="1" fallbackOnNoAd="0">
       <AdSystem version="4.0">iabtechlab</AdSystem>