diff --git a/extensions/gdata/tests/conf/tests.xml b/extensions/gdata/tests/conf/tests.xml
index df5920edc..0cead5318 100644
--- a/extensions/gdata/tests/conf/tests.xml
+++ b/extensions/gdata/tests/conf/tests.xml
@@ -1,4 +1,4 @@
-<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
+<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
  
 <suite name="GData extension">
   <test name="tests">
diff --git a/extensions/jython/tests/conf/tests.xml b/extensions/jython/tests/conf/tests.xml
index 86ba31ab2..f5c929bc8 100644
--- a/extensions/jython/tests/conf/tests.xml
+++ b/extensions/jython/tests/conf/tests.xml
@@ -1,4 +1,4 @@
-<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
+<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
  
 <suite name="Jython extension">
   <test name="tests">
diff --git a/extensions/phonetic/tests/conf/tests.xml b/extensions/phonetic/tests/conf/tests.xml
index 7010579da..7ad8efc22 100644
--- a/extensions/phonetic/tests/conf/tests.xml
+++ b/extensions/phonetic/tests/conf/tests.xml
@@ -1,4 +1,4 @@
-<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
+<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
  
 <suite name="Wikidata extension">
   <test name="tests">
diff --git a/extensions/wikidata/tests/conf/tests.xml b/extensions/wikidata/tests/conf/tests.xml
index 860c0c313..c509c23a8 100644
--- a/extensions/wikidata/tests/conf/tests.xml
+++ b/extensions/wikidata/tests/conf/tests.xml
@@ -1,4 +1,4 @@
-<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
+<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
  
 <suite name="Wikidata extension" object-factory="org.powermock.modules.testng.PowerMockObjectFactory">
   <test name="tests">
diff --git a/main/tests/server/conf/tests.xml b/main/tests/server/conf/tests.xml
index dfe3ec0d3..76e9f3e79 100644
--- a/main/tests/server/conf/tests.xml
+++ b/main/tests/server/conf/tests.xml
@@ -24,7 +24,7 @@
   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.
 -->
-<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
+<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
  
 <suite name="Refine Unit Tests">
   <test name="tests">