diff --git a/core/start-service.sh b/core/start-service.sh
index 7a5d456..0811807 100755
--- a/core/start-service.sh
+++ b/core/start-service.sh
@@ -14,7 +14,7 @@ fi
 [ -n "${ADDITIONAL_KOPANO_PACKAGES// }" ] && for installpkg in $ADDITIONAL_KOPANO_PACKAGES; do
 	# shellcheck disable=SC2016 disable=SC2086
 	if [ "$(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c 'ok installed')" -eq 0 ]; then
-		apt --assume-yes install "$installpkg"
+		apt --assume-yes --no-upgrade install "$installpkg"
 	fi
 done
 
diff --git a/webapp/start.sh b/webapp/start.sh
index 5159e3b..b99672e 100755
--- a/webapp/start.sh
+++ b/webapp/start.sh
@@ -17,7 +17,7 @@ ADDITIONAL_KOPANO_PACKAGES="$ADDITIONAL_KOPANO_PACKAGES $ADDITIONAL_KOPANO_WEBAP
 [ -n "${ADDITIONAL_KOPANO_PACKAGES// }" ] && for installpkg in $ADDITIONAL_KOPANO_PACKAGES; do
 	# shellcheck disable=SC2016 disable=SC2086
 	if [ "$(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c 'ok installed')" -eq 0 ]; then
-		apt --assume-yes install "$installpkg"
+		apt --assume-yes --no-upgrade install "$installpkg"
 	fi
 done
 
diff --git a/zpush/start.sh b/zpush/start.sh
index e5cf0bc..e93e275 100755
--- a/zpush/start.sh
+++ b/zpush/start.sh
@@ -41,7 +41,7 @@ php_cfg_gen() {
 [ -n "${ADDITIONAL_KOPANO_PACKAGES// }" ] && for installpkg in $ADDITIONAL_KOPANO_PACKAGES; do
 	# shellcheck disable=SC2016 disable=SC2086
 	if [ "$(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c 'ok installed')" -eq 0 ]; then
-		apt --assume-yes install "$installpkg"
+		apt --assume-yes --no-upgrade install "$installpkg"
 	fi
 done