diff --git a/net/adblock/Makefile b/net/adblock/Makefile
index dbc04c199..3acc0ce6a 100644
--- a/net/adblock/Makefile
+++ b/net/adblock/Makefile
@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=adblock
-PKG_VERSION:=0.22.0
+PKG_VERSION:=0.22.1
 PKG_RELEASE:=1
 PKG_LICENSE:=GPL-3.0+
 PKG_MAINTAINER:=Dirk Brenken <dirk@brenken.org>
diff --git a/net/adblock/files/adblock-helper.sh b/net/adblock/files/adblock-helper.sh
index b033700d0..8f46a5b37 100644
--- a/net/adblock/files/adblock-helper.sh
+++ b/net/adblock/files/adblock-helper.sh
@@ -138,13 +138,13 @@ f_envparse()
             done
         elif [ "${config}" = "wancheck" ]
         then
-           unset adb_wandev
+           unset adb_wandev 2>/dev/null
         elif [ "${config}" = "ntpcheck" ]
         then
-           unset adb_ntpsrv
+           unset adb_ntpsrv 2>/dev/null
         elif [ "${config}" = "shalla" ]
         then
-           unset adb_cat_shalla
+           unset adb_cat_shalla 2>/dev/null
         fi
     }
 
@@ -157,7 +157,7 @@ f_envparse()
     # set temp variables and counter
     #
     adb_tmpfile="$(mktemp -tu 2>/dev/null)"
-    adb_tmpdir="$(mktemp -d 2>/dev/null)"
+    adb_tmpdir="$(mktemp -p /tmp -d 2>/dev/null)"
 
     # set adblock source ruleset definitions
     #
@@ -173,14 +173,6 @@ f_envparse()
     #
     adb_dnsfile="/tmp/dnsmasq.d/adlist.conf"
     adb_dnsformat="sed 's/^/address=\//;s/$/\/'${adb_ip}'/'"
-
-    # remove unused environment variables
-    #
-    env_list="$(set | grep -o "CONFIG_[A-Za-z_]*")"
-    for var in ${env_list}
-    do
-        unset "${var}" 2>/dev/null
-    done
 }
 
 #############################################
@@ -294,11 +286,11 @@ f_envcheck()
     check="$(printf "${pkg_list}" | grep "^ca-certificates -")"
     if [ -z "${check}" ]
     then
-        curl_parm="--insecure"
-        wget_parm="--no-check-certificate"
+        curl_parm="-q --insecure"
+        wget_parm="--no-config --no-check-certificate"
     else
-        unset curl_parm
-        unset wget_parm
+        curl_parm="-q"
+        wget_parm="--no-config"
     fi
 
     # check total and swap memory
@@ -424,6 +416,16 @@ f_envcheck()
             f_remove
         fi
     fi
+
+    # remove no longer used environment variables
+    #
+    env_list="$(set | grep -o "CONFIG_[A-Za-z0-9_]*")"
+    for var in ${env_list}
+    do
+        unset "${var}" 2>/dev/null
+    done
+    unset env_list 2>/dev/null
+    unset pkg_list 2>/dev/null
 }
 
 ################################################
@@ -495,10 +497,10 @@ f_deltemp()
        rm -f "${adb_tmpfile}" >/dev/null 2>&1
     fi
     if [ -d "${adb_tmpdir}" ]
-        then
+    then
        rm -rf "${adb_tmpdir}" >/dev/null 2>&1
     fi
-    f_log "domain adblock processing finished (${adb_version})"
+    f_log "domain adblock processing finished (${adb_version}, ${openwrt_version})"
     exit ${rc}
 }
 
diff --git a/net/adblock/files/adblock-update.sh b/net/adblock/files/adblock-update.sh
index 4c198ac7a..9bd421b9c 100755
--- a/net/adblock/files/adblock-update.sh
+++ b/net/adblock/files/adblock-update.sh
@@ -25,12 +25,13 @@
 
 # set script version
 #
-adb_version="0.22.0"
+adb_version="0.22.1"
 
-# get current pid and script directory
+# get current pid, script directory and openwrt version
 #
 pid=${$}
 adb_scriptdir="${0%/*}"
+openwrt_version="$(cat /etc/openwrt_version 2>/dev/null)"
 
 # source in adblock function library
 #
@@ -53,7 +54,7 @@ trap "f_log 'trap error' '600'; f_restore" 1 2 3 10 11 15
 
 # start logging
 #
-f_log "domain adblock processing started (${adb_version})"
+f_log "domain adblock processing started (${adb_version}, ${openwrt_version})"
 
 # load environment
 #
@@ -75,7 +76,7 @@ then
     #
     shalla_archive="${adb_tmpdir}/shallalist.tar.gz"
     shalla_file="${adb_tmpdir}/shallalist.txt"
-    curl "${curl_parm}" --max-time "${adb_maxtime}" "${adb_arc_shalla}" -o "${shalla_archive}" 2>/dev/null
+    curl ${curl_parm} --max-time "${adb_maxtime}" "${adb_arc_shalla}" --output "${shalla_archive}" 2>/dev/null
     rc=${?}
     if [ $((rc)) -eq 0 ]
     then
@@ -96,7 +97,7 @@ then
         then
             if [ -r "${adb_tmpdir}/BL/${category}/domains" ]
             then
-                cat "${adb_tmpdir}/BL/${category}/domains" >> "${shalla_file}" 2>/dev/null
+                cat "${adb_tmpdir}/BL/${category}/domains" 2>/dev/null >> "${shalla_file}"
             fi
         else
             f_log "shallalist archive extraction failed (${category})" "${rc}"
@@ -124,10 +125,10 @@ do
     check_url="$(printf "${url}" | sed -n '/^https:/p')"
     if [ -n "${check_url}" ]
     then
-        tmp_var="$(wget "${wget_parm}" --timeout="${adb_maxtime}" --tries=1 --output-document=- "${url}" 2>/dev/null)"
+        tmp_var="$(wget ${wget_parm} --timeout="${adb_maxtime}" --tries=1 --output-document=- "${url}" 2>/dev/null)"
         rc=${?}
     else
-        tmp_var="$(curl "${curl_parm}" --max-time "${adb_maxtime}" "${url}" 2>/dev/null)"
+        tmp_var="$(curl ${curl_parm} --max-time "${adb_maxtime}" "${url}" 2>/dev/null)"
         rc=${?}
     fi
 
@@ -143,7 +144,7 @@ do
         then
             rm -f "${shalla_file}" >/dev/null 2>&1
         fi
-        unset tmp_var
+        unset tmp_var 2>/dev/null
     elif [ $((rc)) -eq 0 ] && [ -z "${tmp_var}" ]
     then
         f_log "empty source download finished (${url})"
@@ -157,11 +158,11 @@ done
 # and finally rewrite ad/abuse domain information to dnsmasq file
 #
 > "${adb_dnsfile}"
-grep -vxf "${adb_whitelist}" < "${adb_tmpfile}" 2>/dev/null | sort -u 2>/dev/null | eval "${adb_dnsformat}" 2>/dev/null >> "${adb_dnsfile}" 2>/dev/null
+grep -vxf "${adb_whitelist}" < "${adb_tmpfile}" 2>/dev/null | sort -u 2>/dev/null | eval "${adb_dnsformat}" 2>/dev/null >> "${adb_dnsfile}"
 rc=${?}
 if [ $((rc)) -eq 0 ]
 then
-    unset adb_tmpfile
+    rm -f "${adb_tmpfile}" >/dev/null 2>&1
     f_log "domain merging finished"
 else
     f_log "domain merging failed" "${rc}"