diff --git a/.github/workflows/packaging.yml b/.github/workflows/packaging.yml
index 55351b3..98e04ae 100644
--- a/.github/workflows/packaging.yml
+++ b/.github/workflows/packaging.yml
@@ -18,8 +18,16 @@ jobs:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
 
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '^3.7' # request python 3.7+ for datetime.datetime.fromisoformat
+
       - name: Build Packages
+        env:
+          GITHUB_TOKEN: ${{ secrets.ACCESS_TOKEN }}
         run: |
+          python -m pip install --upgrade pip
+          python -m pip install urllib3
           cd build
           ./build.sh
 
@@ -28,6 +36,6 @@ jobs:
         with:
           name: Release Packages
           path: |
-            build/debain/*.deb
-            build/rpm/*.rpm
-            build/openwrt/*.opk
+            build/debian/zjunet_*.deb
+            build/rpm/zjunet_*.rpm
+            build/openwrt/zjunet_*.opk
diff --git a/build/build.sh b/build/build.sh
index 7d1f11c..36e26ba 100755
--- a/build/build.sh
+++ b/build/build.sh
@@ -6,17 +6,46 @@ fail() {
 	echo -e "\033[31mERROR: Failed to build $1\033[0m" 1>&2
 }
 
-pushd rpm > /dev/null
-./build.sh $VERSION || fail 'RPM package'
-popd > /dev/null
+if [[ $# -gt 0 ]]; then
+	for arg in $*; do
+		case $arg in
+			rpm)
+				USE_RPM=1
+				;;
+			debian)
+				USE_DEB=1
+				;;
+			openwrt)
+				USE_OPK=1
+				;;
+			*)
+				echo "Invalid package $arg"
+				exit 1
+		esac
+	done
+else
+	USE_RPM=1
+	USE_DEB=1
+	USE_OPK=1
+fi
 
-pushd debian > /dev/null
-./build.sh $VERSION || fail 'Debian package'
-popd > /dev/null
+if [[ ! -z $USE_RPM ]]; then
+	pushd rpm > /dev/null
+	./build.sh $VERSION || fail 'RPM package'
+	popd > /dev/null
+fi
 
-pushd openwrt > /dev/null
-./build.sh $VERSION || fail 'OpenWrt package'
-popd > /dev/null
+if [[ ! -z $USE_DEB ]]; then
+	pushd debian > /dev/null
+	./build.sh $VERSION || fail 'Debian package'
+	popd > /dev/null
+fi
+
+if [[ ! -z $USE_OPK ]]; then
+	pushd openwrt > /dev/null
+	./build.sh $VERSION || fail 'OpenWrt package'
+	popd > /dev/null
+fi
 
 echo -ne "\033[0;32m"
 find . -regextype posix-egrep -regex ".*\.(opk|deb|rpm)$"
diff --git a/build/changelog.py b/build/changelog.py
index d7764c3..cfff917 100755
--- a/build/changelog.py
+++ b/build/changelog.py
@@ -8,7 +8,7 @@ import datetime
 
 def get_time(s):
     if 'fromisoformat' in dir(datetime.datetime):
-        return datetime.datetime.fromisoformat(s)
+        return datetime.datetime.fromisoformat(s.replace('Z', '+00:00'))
     else:
         return __import__('dateutil.parser').parser.parse(s)
 
@@ -54,7 +54,7 @@ def get_author(name):
     return data
 
 def get_changelog(owner, name):
-    print('Reading releases of {} in {}'.format(owner, name), flush=True, file=sys.stderr)
+    print('Reading releases of {1} in {0}'.format(owner, name), flush=True, file=sys.stderr)
     releases = api_get('repos/{}/{}/releases'.format(owner, name))
     releases = filter(lambda v: not v['draft'] and not v['prerelease'], releases)
 
diff --git a/build/rpm/build_spec.sh b/build/rpm/build_spec.sh
index 5bea7b2..7eb32b0 100755
--- a/build/rpm/build_spec.sh
+++ b/build/rpm/build_spec.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 VERSION=$1
 REALVERSION=`echo "$VERSION" | cut -d'-' -f1`
@@ -63,5 +63,5 @@ echo "" >> zjunet.spec
 echo "%post" >> zjunet.spec
 echo "/usr/share/zjunet/zjunet-postinst || true" >> zjunet.spec
 echo "" >> zjunet.spec
-../changelog.py rpm >> zjunet.spec
 
+../../changelog.py rpm >> zjunet.spec