CI: swith to official KorAP-XML-Krill v0.53
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f433e17..05ceda8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -83,7 +83,7 @@
     - start_section install_perl_packages "Installing missing Perl packages"
     - curl -L https://cpanmin.us | perl - App::cpanminus
     - cpanm -n -l $PERL_LOCAL_LIB_ROOT File::ShareDir::Install https://github.com/KorAP/KorAP-XML-TEI.git
-    - cpanm -n -l $PERL_LOCAL_LIB_ROOT https://github.com/kupietz/KorAP-XML-Krill.git
+    - cpanm -n -l $PERL_LOCAL_LIB_ROOT https://github.com/KorAP/KorAP-XML-Krill.git@v0.53
     - cpanm -n -l $PERL_LOCAL_LIB_ROOT https://github.com/KorAP/KorAP-XML-CoNLL-U.git
     - end_section install_perl_packages