diff --git a/.appveyor.yml b/.appveyor.yml
index d8e2e2af1..d282fd4e8 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -26,7 +26,7 @@ shallow_clone: false
 environment:
   DTS: datalad_next
   APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-  INSTALL_SYSPKGS: graphicsmagick-imagemagick-compat moreutils jq uidmap
+  INSTALL_SYSPKGS: graphicsmagick-imagemagick-compat moreutils jq uidmap fuse2fs
   # go with whatever is most recent to catch anything that might break
   # with them
   INSTALL_GITANNEX: git-annex -m snapshot
diff --git a/docs/conf.py b/docs/conf.py
index 09cafed2c..ae80e0d4a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -180,6 +180,10 @@
     'https://twitter.com/datalad',
     # maybe a user-agent issue? github.com/sphinx-doc/sphinx//issues/10343
     'https://github.com/datalad/datalad-extension-template/generate',
+    # (temporary?) SSL certificate error
+    'https://fcon_1000.projects.nitrc.org/*',
+    # local link fails to resolve, maybe because its a build artifact?
+    '../_images/intro-v1-cover.jpg',
 ]
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/requirements.txt b/requirements.txt
index 1118f77d6..c37ddd54e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ chardet
 docutils
 idna
 imagesize
-Jinja2 < 3.1
+Jinja2
 MarkupSafe
 packaging
 Pygments