diff --git a/src/catch2/reporters/catch_reporter_xml.cpp b/src/catch2/reporters/catch_reporter_xml.cpp
index ec156f35..57fa1cab 100644
--- a/src/catch2/reporters/catch_reporter_xml.cpp
+++ b/src/catch2/reporters/catch_reporter_xml.cpp
@@ -56,6 +56,7 @@ namespace Catch {
         m_xml.startElement("Catch2TestRun")
              .writeAttribute("name"_sr, m_config->name())
              .writeAttribute("rng-seed"_sr, m_config->rngSeed())
+             .writeAttribute("xml-format-version"_sr, 2)
              .writeAttribute("catch2-version"_sr, libraryVersion());
         if ( m_config->testSpec().hasFilters() ) {
             m_xml.writeAttribute( "filters"_sr, m_config->testSpec() );
diff --git a/tests/SelfTest/Baselines/xml.sw.approved.txt b/tests/SelfTest/Baselines/xml.sw.approved.txt
index 0e853bfe..4ff2e4f2 100644
--- a/tests/SelfTest/Baselines/xml.sw.approved.txt
+++ b/tests/SelfTest/Baselines/xml.sw.approved.txt
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<Catch2TestRun name="<exe-name>" rng-seed="1" catch2-version="<version>" filters="&quot;*&quot; ~[!nonportable] ~[!benchmark] ~[approvals]">
+<Catch2TestRun name="<exe-name>" rng-seed="1" xml-format-version="2" catch2-version="<version>" filters="&quot;*&quot; ~[!nonportable] ~[!benchmark] ~[approvals]">
   <TestCase name="# A test name that starts with a #" filename="tests/<exe-name>/UsageTests/Misc.tests.cpp" >
     <OverallResult success="true"/>
   </TestCase>
diff --git a/tests/SelfTest/Baselines/xml.sw.multi.approved.txt b/tests/SelfTest/Baselines/xml.sw.multi.approved.txt
index 06be5f0c..a0096170 100644
--- a/tests/SelfTest/Baselines/xml.sw.multi.approved.txt
+++ b/tests/SelfTest/Baselines/xml.sw.multi.approved.txt
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<Catch2TestRun name="<exe-name>" rng-seed="1" catch2-version="<version>" filters="&quot;*&quot; ~[!nonportable] ~[!benchmark] ~[approvals]">
+<Catch2TestRun name="<exe-name>" rng-seed="1" xml-format-version="2" catch2-version="<version>" filters="&quot;*&quot; ~[!nonportable] ~[!benchmark] ~[approvals]">
   <TestCase name="# A test name that starts with a #" filename="tests/<exe-name>/UsageTests/Misc.tests.cpp" >
     <OverallResult success="true"/>
   </TestCase>