diff --git a/BACKPORT b/BACKPORT
new file mode 100644
index 00000000..abbc05f5
--- /dev/null
+++ b/BACKPORT
@@ -0,0 +1,343 @@
+This fork of Dino diverged from upstream on this commit:
+
+f25bfb00969a7e09996da2d5500e6718f4cc0148
+
+However, this fork of Dino aims to backport all compatible security
+fixes and improvements from upstream. This is an exhaustive list of
+every commit that was reviewed and its status, plus additional
+comments:
+
+7e7dcedaf31ee35499875491c9f569c575d28435: Not applied.
+As its commit message suggests, this commit ported Dino from GTK3 to
+GTK4, but this fork will keep using GTK3 as a requirement.
+
+2b3ce5fc95c63ed7d54e207db0585c8b8bbcd603: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+f44cbe02c17df1f02ad49c63cd784fec0ea02d85: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+e51b55432fe98e0fbc036fe785ef50fbf1589034: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+0af92393f134c59646deaab7d963a32c0d3d58b2: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+517363dfc9dab81c4b59310c739bcf71266fabe0: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+6bfa70fc7045669be435d3757456e1da7d341927: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+5103a7fb7b32fcee6656dbae0eec54fb26f89d80: Not applied.
+The resource tree for Dino got changed during the GTK4 port, including
+some icons. However, this commit is not needed for this fork.
+
+7b252d040a845b7e9c515f61927fbf5bf7ed4c3a: Partially applied.
+However, it had to be slightly adapted to the dependencies as listed
+by our version of plugins/rtp/CMakeLists.txt.
+
+d6afa6e8ff4cfb533140d9434b83f18f627f11ca: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+054d3fec1627a9ee8d84d636d578aa68d3494d19: Not applied.
+None of these changes seem required or seem to fix anything in our
+fork.
+
+e85477bb19166e742e34852b2a99b33e55565ded: Not applied.
+I am unsure whether this commit would break anything, and so far I had
+no problems on 0.56.0, which is older than 0.56.1.
+Also, these changes were introduced by the change from GTK3 to GTK4.
+Some further reference: https://github.com/dino/dino/pull/1234.
+
+0aa73c4569a90031d8a88173f8689c18d02ddbe2: Not applied.
+Because of the same reasons as e85477bb19166e742e34852b2a99b33e55565ded.
+
+14bc3d6717515e0b34b02ef5b5ad4c3ec52ccdc2: Not applied.
+This is regression introduced by
+f44cbe02c17df1f02ad49c63cd784fec0ea02d85, which was part of the effort
+to port Dino to GTK4.
+
+117f19381233207e4b5aef03c82e7dd4b2d1debd: Not applied.
+Again, these look like regressions introduced with the migration to
+GTK4.
+
+b8e84c83268a11ae41ad1d673999362427fd755c: Applied.
+
+7ad52d9335579d03613036a7da9967fcf0c5d6b3: Not applied.
+This commit looks incompatible with GTK3, but I might be wrong.
+
+146af3152475f12c9b19a92c4779a53f6fc517ce: Not applied.
+Some resources were moved when porting Dino to GTK4, but this does not
+apply to our fork.
+
+21ab48e09aa6b0ade8f25bdc93f89f8d3aa462e7: Not applied.
+It looks like this is trying to solve a regression introduced during
+the migration from GTK3 to GTK4, as the calls to
+jid_entry.key_release_event.connect() and
+nick_entry.key_release_event.connect() are not commented out on this
+fork.
+
+85342ee2eb2aa3e6d7599c503d17c00d861bafcb: Not applied.
+Drag and drop uploading always forked for this fork.
+
+03878eee495cac8dcc8baf0ff4f84e4c9e76114e: Not applied.
+These were disabled during the migration from GTK3 to GTK4, so this
+commit does not apply to this fork.
+
+7d8b08deca0aa4eb24def6b9af4ec180c0bc9a27: Partially applied.
+Whereas the changes on list_row.ui caused many conflicts, the null
+check on conversation_view_controller.vala is required.
+
+9c736af765d8c62838440afbfd2ad7ee78b44951: Not applied.
+check_if_done() was introduced by
+21ab48e09aa6b0ade8f25bdc93f89f8d3aa462e7, which was not applied,
+either.
+
+6c6e7e3aa7935ec513b7e5ea9b53a92b741ecf92: Partially applied.
+Almost everything could be cleanly backported, except from
+main/src/ui/add_conversation/conference_list.vala, where the original
+implementation was preferred.
+
+80258a874ddfeb87b4b71f5791eab94a2465de6d: Not applied.
+I have no personal interest in XMPP reactions for this fork, as other
+popular XMPP clients such as Conversations are still rely on styling as
+described on https://xmpp.org/extensions/xep-0393.html#quote.
+
+bc5a1d35cbf5c1aca406fa0fe81ca60d6b280bd5: Applied.
+
+7e0d1db1965555720db2bef7380e61c23ef6dbcd: Applied.
+
+f82f788f43e385391db2827cde151830fc91bc14: Applied.
+
+1bf57a42fa5c36977132d21f59ca6637fcd0c3d3: Applied.
+
+11b6e615b73e4183a06f9d456634c44ead612336: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+09829b33824ab7d1fbf9886b7ed3e42cd8c34ff2: Not applied.
+This commit fixes a regression introduced by
+80258a874ddfeb87b4b71f5791eab94a2465de6d, which is related to
+reactions, something this fork does not implement.
+
+a45280f8dfe45f8908b44cd13996316af44117e9: Not applied.
+This commit is related to reactions, which this fork does not
+implement.
+
+2ab7374aa53f70b30765a02865d92e6d71c6e623: Not applied.
+This commit is related to reactions, which this fork does not
+implement.
+
+a2f2224781a82121c86a1f19b309245bc8369a91: Applied.
+
+809c1579e41000f2f43eeb05735afc8165a1a430: Applied.
+The commit message was a bit misleading: the real intention behind it
+was to use the same implementation for both libsoup2/3.
+
+6e37f3fe3fa0f4ce9a25a91e9d97191c8e4abec1: Applied.
+
+e62955d3cf266a7f7ff0f2085a64f1c99021127c: Not applied.
+Async uploads and downloads seem to work well. I do not see the need
+for this patch.
+
+7a19a25156a73e7e6b6d77fabc7621e7d2c443f0: Partially applied.
+The changes to libdino/src/service/reactions.vala are out of scope for
+this fork.
+
+a2e894dda132f1679ee8e9998879be6bda7ab320: Applied.
+
+cdd22e404eca3db640b6f2f2789314f7cbb65de6: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+d1fb22ebedca7dbbbd0f693baa3c38d99ab5c344: Not applied.
+This commit is related to reactions, which this fork does not
+implement.
+
+4d50c51a75de70c0f30a196e1f128154ba1651fa: Applied.
+
+30f99d1347f8f5e2db364a25910d76b0faf2ea36: Applied.
+
+799d09a4c98d1a00790f261600d3f4d813140954: Applied.
+
+4d7809bb12199a598b531ca3ca019a4bb5a867f7: Partially applied.
+- Too many changes are introduced to
+main/src/ui/chat_input/encryption_button.vala, which might break this
+fork.
+- Changes related to own_occupant_ids are
+related to reactions (as introduced by
+80258a874ddfeb87b4b71f5791eab94a2465de6d), and thus are out of scope
+for this fork.
+- This commit removes plugins/omemo/src/ui/manage_key_dialog.vala, which
+this fork still relies on.
+- headerbar is still used by plugins/omemo/src/ui/manage_key_dialog.vala,
+and thus should not be removed.
+- Too many changes are introduced to
+main/src/ui/conversation_content_view/conversation_item_skeleton.vala,
+which might break this fork.
+- The changes in
+main/src/ui/conversation_content_view/conversation_view.vala break
+the build.
+- The changes in
+main/src/ui/conversation_view_controller.vala break the build.
+
+dc52e7595cca06d0a2da7d11b3c88cb2f7ce529c: Not applied.
+I am not interested in XEP-0461 (replies) for this fork, as the
+fallback implementations is already provided here.
+
+60371331e0882758b0b9c2efedb3821e716defd7: Not applied.
+Replies are out of scope for this fork.
+
+424a4290622246303a7b73410d7e4a5a6d57dd6b: Not applied.
+Replies are out of scope for this fork.
+
+0c4aea96ffbc05d6efeb9a83424b872ce7f30d88: Not applied.
+Replies are out of scope for this fork.
+
+cb3b19b01deb8460627578b885339e7528411f6f: Not applied.
+Replies are out of scope for this fork.
+
+75500dc767f2cf657c0fbb5d2a4d4557183ed2e9: Not applied.
+This commit breaks the build in some places, and I am not particulary
+interested in conversation pinning anyway.
+
+860c72bfc93d252d45eb97e71cf9ff22985c7ef9: Not applied.
+This commit fixes regressions introduced by other commits that were not
+introduced by this fork, such as
+7e7dcedaf31ee35499875491c9f569c575d28435.
+
+73c0263f35a73b68d20d299ee7fe8c37b9a6ffeb: Not applied.
+This commit depends on other commits that were not introduced by this
+fork, such as cb3b19b01deb8460627578b885339e7528411f6f, which was
+related to replies (not implemented by this fork).
+
+05289e0b4dc9bc076955e27b30b386cb7f0604c7: Not applied.
+Replies are out of scope for this fork.
+
+7da79864b384c9370a5937d480230e771834d91a: Not applied.
+Conversation pinning is out of scope for this fork.
+
+7e0d1db1965555720db2bef7380e61c23ef6dbcd: Applied.
+
+f6e73d85c00a60a719da95a048ba2c15712325c3: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+1ef42b47d22d21600ccf1e2d8b4d80605448660d: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+2741bf21ae6d53324a512dacef65d540be840fe4: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+ba9462503c0561dbe8306e3bf6aa49392bfc8078: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+04acab82c98f5d9cdb798ba3baac8d73b097b1df: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+e934a76a1139938ae668836b812102cd5d9c9d9f: Not applied.
+GTK4-related changes are out of scope for this fork.
+Also, this fork already has a back button for ConversationTitleBar.
+
+0d7c8bb6e117f8cdd631730302413aad21632c2d: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+92aca5672db723121471e513e83b68742761d1b5: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+4b391f3f31c2272be11a24c8301641b045260e99: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+ef98adb18a016dba65162602eb336fb82c64805e: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+6a182ba313026b93d54a9d2246a0ab68894c6833: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+99d9cb383abb1a33f6d0572deb4292dbf358f3ce: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+cc7db3b85f7b29bfac333937d8bf09a81d8dc4a5: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+e35df88d4a00c3a34f2b4d9fb7f10bb5d877bd29: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+26be9d4bb40b223cb8a657b03e6457988a8cc269: Not applied.
+Reactions are out of scope for this fork.
+
+5d9978b38bb0e729dcccecddd08cc59e5585a6cc: Not applied.
+Reactions are out of scope for this fork.
+
+c813a6d2405980c71450cefa10abdf11fab8e995: Not applied.
+GTK4-related changes are out of scope for this fork.
+
+e833a924b5a66048506b4e0b0885ce2e35cac6fc: Applied.
+
+e833a924b5a66048506b4e0b0885ce2e35cac6fc: Applied.
+
+04eb0e763b0e02ea1bc698f1ccb24f84b0154010: Not applied.
+This commit is way too big to merge and is tighly coupled to upstream
+source code. Maybe a similar commit can be provided independently.
+
+d0a00e1e7549609f7d83e7b432f7f547a1fcebb0: Applied.
+
+1dbacbbcab139d0f8036446441ad143ef7e7eb30: Applied.
+
+10a2bce5122dcd1e6fef037633a26568bf27d4d1: Applied.
+
+b0b81b88c6948dcfd2b1b82a9fe7357316a3af1f: Not applied.
+Both reactions and replies are out of scope for this fork.
+
+e3c833bce0713e9a0290841306c7727dfc1e3860: Applied.
+This fork defines different logic for update_received_mark(), so the
+commit was adapted to it.
+
+1e23b7bbd2a66e5ff40ae5fc5aa6523fa604f242: Not applied.
+Replies are out of scope for this fork.
+
+9e11bef219880b5bdc5d299c31ec6249596a86ba: Not applied.
+string_if_tooltips_active() was added by
+6bfa70fc7045669be435d3757456e1da7d341927, which is GTK4-related.
+
+921f28c84bbda56ec93df7dcde7c828eaabb0b58: Not applied.
+Reactions are out of scope for this fork.
+
+3aa3912dc3ea740a5b93f8b694ead45e1b655238: Not applied.
+main/src/ui/widgets/date_separator.vala depends on GTK4 libadwaita.
+
+e0ece2aa62aa6b8350be83c787ea003a75f07437: Partially applied.
+The changes to main/data/unified_main_content.ui and
+main/src/ui/conversation_selector/conversation_selector.vala depend on
+other commits related to GTK4 and libadwaita.
+
+95fefaff51e5506d3f0e5fe8bced14aeb3fbe037: Applied.
+
+18321ed15ce782ff5d1f24de9f2fb459d714d125: Partially applied.
+The changes to libdino/src/service/reactions.vala and
+xmpp-vala/src/module/xep/0444_reactions.vala are not relevant to this
+fork.
+
+d76e12b215eb62e4eda5a0f92fbf5c1bd7c1848e: Applied.
+
+f74c1f18b12df0d650f74b6fa43b7f2f0a9bce79: Applied.
+
+1d123c7e66d963fd8cc8cc4250b5813a62676f56: Applied.
+
+d092473fe401a5a668e57f054efbd1e84ac6ca59: Applied.
+
+1559a7a60370c2aa0203e5c4222def4ae3258006: Applied.
+
+32ae87a3c4cebaa05e0e702d744900cd414000db: Not applied.
+Seems to cause many conflicts while providing little benefit.
+
+116682e311edca6665a0497c8b225b4fe69859a7: Partially applied.
+Changes to main/src/ui/conversation_content_view/quote_widget.vala are
+not relevant to this fork.
+
+9c5e36020d8997452d4fd07c5a153e1e7fc24088: Applied.
+
+e73b556a1ae5ea4af41c610f7b05545cf60d59c4: Not applied.
+This commit is way too big to merge and is tighly coupled to upstream
+source code. Maybe a similar commit can be provided independently.
+
+5568bbc6bf505c4f8ea93fc460dbeff6f4d36e15: Partially applied.
+Changes related to libadwaita are out of scope for this fork.
diff --git a/README.md b/README.md
index 6950de7f..c133b2b2 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 - Keeps using GTK3.
 - Includes some features that did not make into upstream.
-- Backports bugfixes and improvements from upstream.
+- Backports bugfixes and improvements from upstream (see [`BACKPORT`](BACKPORT)).
 
 ## TODO