diff --git a/hackport.cabal b/hackport.cabal
--- a/hackport.cabal
+++ b/hackport.cabal
@@ -1,6 +1,6 @@
 Cabal-Version:  2.2
 Name:           hackport
-Version:        0.7.2.1
+Version:        0.7.2.2
 License:        GPL-3.0-or-later
 License-file:   LICENSE
 Author:         Henning Günther, Duncan Coutts, Lennart Kolmodin
diff --git a/src/Portage/Metadata.hs b/src/Portage/Metadata.hs
--- a/src/Portage/Metadata.hs
+++ b/src/Portage/Metadata.hs
@@ -116,7 +116,7 @@
 makeDefaultMetadata :: Map.Map String String -> T.Text
 makeDefaultMetadata flags = T.pack $
   unlines [ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
-          , "<!DOCTYPE pkgmetadata SYSTEM \"http://www.gentoo.org/dtd/metadata.dtd\">"
+          , "<!DOCTYPE pkgmetadata SYSTEM \"https://www.gentoo.org/dtd/metadata.dtd\">"
           , "<pkgmetadata>"
           , "\t<maintainer type=\"project\">"
           , "\t\t<email>haskell@gentoo.org</email>"
diff --git a/tests/Portage/MetadataSpec.hs b/tests/Portage/MetadataSpec.hs
--- a/tests/Portage/MetadataSpec.hs
+++ b/tests/Portage/MetadataSpec.hs
@@ -71,7 +71,7 @@
       it "should have a certain format" $ do
         let correctMetadata = T.pack $ unlines
               [ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
-              , "<!DOCTYPE pkgmetadata SYSTEM \"http://www.gentoo.org/dtd/metadata.dtd\">"
+              , "<!DOCTYPE pkgmetadata SYSTEM \"https://www.gentoo.org/dtd/metadata.dtd\">"
               , "<pkgmetadata>"
               , "\t<maintainer type=\"project\">"
               , "\t\t<email>haskell@gentoo.org</email>"
@@ -89,7 +89,7 @@
         let flags = Map.fromList [("flag1","desc1"),("flag2","desc2")]
             correctMetadata = T.pack $ unlines
               [ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
-              , "<!DOCTYPE pkgmetadata SYSTEM \"http://www.gentoo.org/dtd/metadata.dtd\">"
+              , "<!DOCTYPE pkgmetadata SYSTEM \"https://www.gentoo.org/dtd/metadata.dtd\">"
               , "<pkgmetadata>"
               , "\t<maintainer type=\"project\">"
               , "\t\t<email>haskell@gentoo.org</email>"