diff --git a/dev/list-rdeps.sh b/dev/list-rdeps.sh
index dc25fc0..42fa9bb 100755
--- a/dev/list-rdeps.sh
+++ b/dev/list-rdeps.sh
@@ -78,6 +78,11 @@
 		if ! printf "%s\n" "$versions" | grep "$ARCHIVT" | grep -qF "$rdep"; then
 			# we're only interested in packages in both archives.
 			# if a pkg-ver is not in either archive, this doesn't affect the migration process
+			#
+			# FIXME: actually, this is not true in the case where we are upgrading
+			# X from version A to B in unstable, but we want to keep X-A in testing.
+			# In this case, X-A has to go through unstable first and we are interested
+			# in keeping this installable, so can't continue here...
 			continue
 		fi
 		apt-cache show "${rdep}=${ver}" \
diff --git a/src/parking-lot-core-0.4/debian/changelog b/src/parking-lot-core-0.4/debian/changelog
index eea10ff..d461256 100644
--- a/src/parking-lot-core-0.4/debian/changelog
+++ b/src/parking-lot-core-0.4/debian/changelog
@@ -1,3 +1,10 @@
+rust-parking-lot-core-0.4 (0.4.0-3) UNRELEASED-FIXME-AUTOGENERATED-DEBCARGO; urgency=medium
+
+  * Team upload.
+  * Package parking_lot_core 0.4.0 from crates.io using debcargo 2.4.2
+
+ -- Ximin Luo <infinity0@debian.org>  Fri, 10 Jan 2020 11:39:35 +0000
+
 rust-parking-lot-core-0.4 (0.4.0-2) unstable; urgency=medium
 
   * Update rand dependency to 0.7
diff --git a/src/parking-lot-core-0.4/debian/copyright.debcargo.hint b/src/parking-lot-core-0.4/debian/copyright.debcargo.hint
index baf63b8..d9c32fe 100644
--- a/src/parking-lot-core-0.4/debian/copyright.debcargo.hint
+++ b/src/parking-lot-core-0.4/debian/copyright.debcargo.hint
@@ -98,10 +98,10 @@
 
 Files: debian/*
 Copyright:
- 2019 Debian Rust Maintainers <pkg-rust-maintainers@alioth-lists.debian.net>
- 2019 Sylvestre Ledru <sylvestre@debian.org>
- 2019 Wolfgang Silbermayr <wolfgang@silbermayr.at>
- 2019 kpcyrd <git@rxv.cc>
+ 2019-2020 Debian Rust Maintainers <pkg-rust-maintainers@alioth-lists.debian.net>
+ 2019-2020 Sylvestre Ledru <sylvestre@debian.org>
+ 2019-2020 Wolfgang Silbermayr <wolfgang@silbermayr.at>
+ 2019-2020 kpcyrd <git@rxv.cc>
 License: Apache-2.0 or MIT
 
 License: Apache-2.0
diff --git a/src/parking-lot-core-0.4/debian/patches/rand-0.7.patch b/src/parking-lot-core-0.4/debian/patches/rand-0.7.patch
index 98589e8..0f8acec 100644
--- a/src/parking-lot-core-0.4/debian/patches/rand-0.7.patch
+++ b/src/parking-lot-core-0.4/debian/patches/rand-0.7.patch
@@ -1,5 +1,3 @@
-diff --git a/core/src/parking_lot.rs b/core/src/parking_lot.rs
-index 64acaf9..b56deef 100644
 --- a/src/parking_lot.rs
 +++ b/src/parking_lot.rs
 @@ -6,7 +6,7 @@
diff --git a/src/parking-lot-core-0.4/debian/patches/relax-deps.patch b/src/parking-lot-core-0.4/debian/patches/relax-deps.patch
index 0dfca3c..fa8c455 100644
--- a/src/parking-lot-core-0.4/debian/patches/relax-deps.patch
+++ b/src/parking-lot-core-0.4/debian/patches/relax-deps.patch
@@ -1,12 +1,11 @@
 --- a/Cargo.toml
 +++ b/Cargo.toml
-@@ -28,7 +28,8 @@
- optional = true
- 
- [dependencies.rand]
--version = "0.6"
-+version = "0.7"
-+features = ["small_rng"]
+@@ -32,7 +32,7 @@
+ features = ["small_rng"]
  
  [dependencies.smallvec]
- version = "0.6"
+-version = "0.6"
++version = ">= 0.6, < 2"
+ 
+ [dependencies.thread-id]
+ version = "3.2.0"
diff --git a/src/parking-lot-core-0.4/debian/patches/series b/src/parking-lot-core-0.4/debian/patches/series
index d03b6fa..e9e1005 100644
--- a/src/parking-lot-core-0.4/debian/patches/series
+++ b/src/parking-lot-core-0.4/debian/patches/series
@@ -1,2 +1,3 @@
+update-deps.patch
 relax-deps.patch
 rand-0.7.patch
diff --git a/src/parking-lot-core-0.4/debian/patches/update-deps.patch b/src/parking-lot-core-0.4/debian/patches/update-deps.patch
new file mode 100644
index 0000000..0dfca3c
--- /dev/null
+++ b/src/parking-lot-core-0.4/debian/patches/update-deps.patch
@@ -0,0 +1,12 @@
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -28,7 +28,8 @@
+ optional = true
+ 
+ [dependencies.rand]
+-version = "0.6"
++version = "0.7"
++features = ["small_rng"]
+ 
+ [dependencies.smallvec]
+ version = "0.6"