diff --git a/src/linux/scripts/afterRemoveRPM.sh b/src/linux/scripts/afterRemoveRPM.sh
index f77beb60c..064824517 100644
--- a/src/linux/scripts/afterRemoveRPM.sh
+++ b/src/linux/scripts/afterRemoveRPM.sh
@@ -113,16 +113,17 @@ if [ "$1" = "0" ]; then
     remove
     purge
 elif [ "$1" = "1" ]; then
-    # Call the purge function
     echo "Package is being upgraded"
     # Check the version of the package and if it's inferior to 1.5.0, we need to copy the variables.env file
-    if [ "$2" <= "1.5.0" ]; then
+    VERSION=$(rpm -q --queryformat '%{VERSION}' bunkerweb)
+    if [ "$VERSION" <= "1.5.0" ]; then
         echo "ℹ️ Copy /etc/bunkerweb/variables.env to /var/tmp/bunkerweb/variables.env"
         do_and_check_cmd cp -f /opt/bunkerweb/variables.env /var/tmp/variables.env
         do_and_check_cmd cp -f /opt/bunkerweb/ui.env /var/tmp/ui.env
     fi
     cp -f /etc/bunkerweb/variables.env /var/tmp/variables.env
     cp -f /etc/bunkerweb/ui.env /var/tmp/ui.env
+    cp -f /var/lib/bunkerweb/db.sqlite3 /var/tmp/db.sqlite3
     exit 0
 fi
 else 
diff --git a/src/linux/scripts/beforeInstall.sh b/src/linux/scripts/beforeInstall.sh
index 3467140f7..2b5bdfa57 100644
--- a/src/linux/scripts/beforeInstall.sh
+++ b/src/linux/scripts/beforeInstall.sh
@@ -15,12 +15,30 @@ function do_and_check_cmd() {
     return 0
 }
 
-# Get the version of the package
-VERSION=$(dpkg-query -W -f='${Version}' bunkerweb)
-
-if dpkg --compare-versions "$VERSION" lt "1.5.0"; then
-    echo "ℹ️ Copy /var/tmp/bunkerweb/variables.env to /etc/bunkerweb/variables.env"
-    do_and_check_cmd cp -f /opt/bunkerweb/variables.env /var/tmp/variables.env
-    echo "ℹ️ Copy /var/tmp/bunkerweb/variables.env to /etc/bunkerweb/variables.env"
-    do_and_check_cmd cp -f /opt/bunkerweb/ui.env /var/tmp/ui.env
+# Check the os running
+if [ -f /etc/os-release ]; then
+    . /etc/os-release
+    OS=$NAME
+    if [[ "$OS" == "Ubuntu" || "$OS" == "Debian" ]]; then
+        # Get the version of the package
+        VERSION=$(dpkg-query -W -f='${Version}' bunkerweb)
+        if dpkg --compare-versions "$VERSION" lt "1.5.0"; then
+            echo "ℹ️ Copy /var/tmp/bunkerweb/variables.env to /etc/bunkerweb/variables.env"
+            do_and_check_cmd cp -f /opt/bunkerweb/variables.env /var/tmp/variables.env
+            echo "ℹ️ Copy /var/tmp/bunkerweb/variables.env to /etc/bunkerweb/variables.env"
+            do_and_check_cmd cp -f /opt/bunkerweb/ui.env /var/tmp/ui.env
+        fi
+    elif [[ "$OS" == "CentOS Linux" || "$OS" == "Fedora" ]]; then
+        # Get the version of the package
+        VERSION=$(rpm -q --queryformat '%{VERSION}' bunkerweb)
+        if [ "$(printf '%s\n' "$VERSION" "$(echo '1.5.0' | tr -d ' ')" | sort -V | head -n 1)" = "$VERSION" ]; then
+            echo "ℹ️ Copy /var/tmp/bunkerweb/variables.env to /etc/bunkerweb/variables.env"
+            do_and_check_cmd cp -f /opt/bunkerweb/variables.env /var/tmp/variables.env
+            echo "ℹ️ Copy /var/tmp/bunkerweb/variables.env to /etc/bunkerweb/variables.env"
+            do_and_check_cmd cp -f /opt/bunkerweb/ui.env /var/tmp/ui.env
+        fi
+    fi
+else
+    echo "❌ Error: /etc/os-release not found"
+    exit 1
 fi
\ No newline at end of file
diff --git a/src/linux/scripts/bunkerweb-ui.sh b/src/linux/scripts/bunkerweb-ui.sh
index 6c67bcdd8..ebfeea4ee 100755
--- a/src/linux/scripts/bunkerweb-ui.sh
+++ b/src/linux/scripts/bunkerweb-ui.sh
@@ -27,7 +27,7 @@ stop() {
     echo "Stopping UI service..."
     if [ -f "/var/tmp/bunkerweb/ui.pid" ]; then
         pid=$(cat /var/tmp/bunkerweb/ui.pid)
-        kill -SIGINT $pid
+        kill -s TERM $pid
     else
         echo "UI service is not running or the pid file doesn't exist."
     fi
diff --git a/src/linux/scripts/postinstall.sh b/src/linux/scripts/postinstall.sh
index da29345e6..19174a65d 100644
--- a/src/linux/scripts/postinstall.sh
+++ b/src/linux/scripts/postinstall.sh
@@ -15,38 +15,66 @@ function do_and_check_cmd() {
     return 0
 }
 
-#Start the nginx service
-echo "Starting nginx service..."
-systemctl start nginx
+#Start the nginx service if it is not already running
+if ! systemctl is-active nginx; then
+    echo "Starting nginx service..."
+    do_and_check_cmd systemctl start nginx
+fi
 
 #Give all the permissions to the nginx user
 echo "Setting ownership for all necessary directories to nginx user and group..."
-chown -R nginx:nginx /usr/share/bunkerweb /var/cache/bunkerweb /var/lib/bunkerweb /etc/bunkerweb /var/tmp/bunkerweb
+do_and_check_cmd chown -R nginx:nginx /usr/share/bunkerweb /var/cache/bunkerweb /var/lib/bunkerweb /etc/bunkerweb /var/tmp/bunkerweb
 
 #Start bunkerweb service as nginx user and enable it to start on boot
 echo "Enabling and starting bunkerweb service..."
-systemctl enable bunkerweb
-systemctl start bunkerweb
+do_and_check_cmd systemctl enable bunkerweb
+do_and_check_cmd systemctl start bunkerweb
 
 #Start and enable bunkerweb-ui service
 echo "Enabling and starting bunkerweb-ui service..."
-systemctl enable bunkerweb-ui
-systemctl start bunkerweb-ui
+do_and_check_cmd systemctl enable bunkerweb-ui
+do_and_check_cmd systemctl start bunkerweb-ui
 
 # Copy old line from environment file to new one
-echo "Copying old line from environment file to new one..."
-while read line; do
-    echo "$line" >> /etc/bunkerweb/variables.env
-done < /var/tmp/variables.env
+# Check if old environment file exists
+if [ -f /var/tmp/variables.env ]; then
+    echo "Old environment file found!"
+    echo "Copying old line from environment file to new one..."
+    while read line; do
+        echo "$line" >> /etc/bunkerweb/variables.env
+    done < /var/tmp/variables.env
+    # Remove old environment files
+    echo "Removing old environment files..."
+    do_and_check_cmd rm -f /var/tmp/variables.env
+else
+    echo "Old environment file not found!"
+    exit 0
+fi
 
-echo "Copying old line from ui environment file to new one..."
-while read line; do
-    echo "$line" >> /etc/bunkerweb/ui.env
-done < /var/tmp/ui.env
+# Copy old line from ui environment file to new one
+# Check if old environment file exists
+if [ -f /var/tmp/ui.env ]; then
+    echo "Old ui environment file found!"
+    echo "Copying old line from ui environment file to new one..."
+    while read line; do
+        echo "$line" >> /etc/bunkerweb/ui.env
+    done < /var/tmp/ui.env
+    # Remove old environment files
+    echo "Removing old environment files..."
+    do_and_check_cmd rm -f /var/tmp/ui.env
+else
+    echo "Old ui environment file not found!"
+    exit 0
+fi
 
-# Remove old environment files
-echo "Removing old environment files..."
-rm -f /var/tmp/variables.env
-rm -f /var/tmp/ui.env
+# Check if old db.sqlite3 file exists
+if [ -f /var/tmp/bunkerweb/db.sqlite3 ]; then
+    echo "Old db.sqlite3 file found!"
+    do_and_check_cmd cp /var/tmp/bunkerweb/db.sqlite3 /var/lib/bunkerweb/db.sqlite3
+    do_and_check_cmd rm -f /var/lib/bunkerweb/db.sqlite3
+else
+    echo "Old db.sqlite3 file not found!"
+    exit 0
+fi
 
 echo "All services started and enabled successfully!"
\ No newline at end of file
diff --git a/tests/Dockerfile-centos b/tests/Dockerfile-centos
index bdb369b75..82f823cb2 100644
--- a/tests/Dockerfile-centos
+++ b/tests/Dockerfile-centos
@@ -13,6 +13,9 @@ rm -f /lib/systemd/system/anaconda.target.wants/*;
 
 RUN dnf -y install sudo
 
+RUN echo -e "[nginx-stable]\nname=nginx stable repo\nbaseurl=http://nginx.org/packages/centos/\$releasever/\$basearch/\ngpgcheck=1\nenabled=1\ngpgkey=https://nginx.org/keys/nginx_signing.key\nmodule_hotfixes=true" > /etc/yum.repos.d/nginx.repo
+RUN sudo dnf install nginx-1.20.2 -y && sudo dnf install epel-release -y
+
 VOLUME [/sys/fs/cgroup]
 
 CMD ["/usr/sbin/init"]
\ No newline at end of file
diff --git a/tests/Upgrade.py b/tests/Upgrade.py
index 6708baa9a..542ddecce 100644
--- a/tests/Upgrade.py
+++ b/tests/Upgrade.py
@@ -2,6 +2,7 @@ import subprocess
 import sys
 import tempfile
 import os
+import time
 
 distro = sys.argv[1]
 if distro == "ubuntu":
@@ -71,7 +72,12 @@ if distro == "ubuntu":
         f.write(bash_script)
         f.flush()
         subprocess.run(
-            ["docker", "cp", f.name, "systemd-ubuntu:/data/install_nginx.sh"]
+            [
+                "docker", 
+                "cp", 
+                f.name, 
+                "systemd-ubuntu:/data/install_nginx.sh"
+            ]
         )
         result = subprocess.run(
             [
@@ -399,34 +405,24 @@ if distro == "ubuntu":
     subprocess.run(
         [
             "docker",
-            "exec",
-            "-it",
+            "rm",
+            "-f",
             "systemd-ubuntu",
-            "bash",
-            "-c",
-            "sudo apt remove -y nginx",
         ]
     )
     subprocess.run(
         [
             "docker",
-            "exec",
-            "-it",
-            "systemd-ubuntu",
-            "bash",
-            "-c",
-            "sudo apt purge -y nginx",
-        ]
-    )
-    subprocess.run(
-        [
-            "docker",
-            "exec",
-            "-it",
-            "systemd-ubuntu",
-            "bash",
-            "-c",
-            "sudo apt autoremove -y",
+            "run",
+            "-d",
+            "--name",
+            "systemd-{}".format(distro),
+            "--privileged",
+            "-v",
+            "/sys/fs/cgroup:/sys/fs/cgroup",
+            "-v",
+            "deb:/data",
+            "jrei/systemd-ubuntu:22.04",
         ]
     )
     subprocess.run(
@@ -452,7 +448,15 @@ if distro == "ubuntu":
         ]
     )
     subprocess.run(
-        ["docker", "exec", "-it", "systemd-ubuntu", "bash", "-c", "sudo apt update"]
+        [
+            "docker",
+            "exec", 
+            "-it", 
+            "systemd-ubuntu", 
+            "bash", 
+            "-c", 
+            "sudo apt update"
+        ]
     )
     subprocess.run(
         [
@@ -1416,7 +1420,7 @@ elif distro == "fedora":
             "docker",
             "exec",
             "-it",
-            "systemd-centos",
+            "systemd-fedora",
             "bash",
             "-c",
             "[ -d /var/lib/bunkerweb ]",
@@ -1433,7 +1437,7 @@ elif distro == "fedora":
             "docker",
             "exec",
             "-it",
-            "systemd-centos",
+            "systemd-fedora",
             "bash",
             "-c",
             "[ -d /etc/bunkerweb ]",
@@ -1542,7 +1546,7 @@ elif distro == "fedora":
             "systemd-fedora",
             "bash",
             "-c",
-            "cat /usr/share/bunkerweb/VERSION",
+            "cat /opt/bunkerweb/VERSION",
         ],
         capture_output=True,
     )
@@ -1557,7 +1561,7 @@ elif distro == "fedora":
             "systemd-fedora",
             "bash",
             "-c",
-            "sudo dnf upgrade -y",
+            "sudo dnf upgrade --refresh -y",
         ]
     )
     subprocess.run(
@@ -1568,7 +1572,77 @@ elif distro == "fedora":
             "systemd-fedora",
             "bash",
             "-c",
-            "sudo dnf install -y /data/bunkerweb.deb",
+            "sudo dnf install dnf-plugin-system-upgrade -y",
+        ]
+    )
+    subprocess.run(
+        [
+            "docker",
+            "exec",
+            "-it",
+            "systemd-fedora",
+            "bash",
+            "-c",
+            "sudo dnf system-upgrade download --releasever=37 -y",
+        ]
+    )
+    subprocess.run(
+        [
+            "docker",
+            "exec",
+            "-it",
+            "systemd-fedora",
+            "bash",
+            "-c",
+            "sudo dnf system-upgrade reboot",
+        ]
+    )
+    # Checking container is running
+    def start_container():
+        subprocess.run(["docker", "start", "systemd-fedora"])
+
+    def check_container_status():
+        result = subprocess.run(["docker", "inspect", "systemd-fedora"], stdout=subprocess.PIPE)
+        return "running" in str(result.stdout)
+
+    while True:
+        start_container()
+        time.sleep(30)
+        if not check_container_status():
+            continue
+        break
+
+    subprocess.run(
+        [
+            "docker",
+            "exec",
+            "-it",
+            "systemd-fedora",
+            "bash",
+            "-c",
+            "sudo dnf install -y curl gnupg2 ca-certificates redhat-lsb-core",
+        ]
+    )
+    subprocess.run(
+        [
+            "docker",
+            "exec",
+            "-it",
+            "systemd-fedora",
+            "bash",
+            "-c",
+            "sudo dnf install nginx-1.22.1 -y",
+        ]
+    )
+    subprocess.run(
+        [
+            "docker",
+            "exec",
+            "-it",
+            "systemd-fedora",
+            "bash",
+            "-c",
+            "sudo dnf upgrade -y /data/bunkerweb.rpm",
         ]
     )
     # Checking version
@@ -1976,27 +2050,40 @@ elif distro == "centos":
 
     # Upgrading test
     print("Upgrading bunkerweb...")
-    # Installing official package
     subprocess.run(
         [
             "docker",
-            "exec",
-            "-it",
+            "rm",
+            "-f",
             "systemd-centos",
-            "bash",
-            "-c",
-            "sudo dnf remove -y nginx",
         ]
     )
     subprocess.run(
         [
+            "sudo",
             "docker",
-            "exec",
-            "-it",
+            "build",
+            "-t",
+            "systemd-centos",
+            "-f",
+            "tests/Dockerfile-centos",
+            ".",
+        ]
+    )
+    subprocess.run(
+        [
+            "sudo",
+            "docker",
+            "run",
+            "-d",
+            "--name",
+            "systemd-centos",
+            "--privileged",
+            "-v",
+            "/sys/fs/cgroup:/sys/fs/cgroup",
+            "-v",
+            "deb:/data",
             "systemd-centos",
-            "bash",
-            "-c",
-            "sudo dnf install -y nginx-1.20.2",
         ]
     )
     subprocess.run(
@@ -2049,6 +2136,28 @@ elif distro == "centos":
     print("Old version:", old_version.stdout.decode().strip())
 
     # Upgrading package
+    subprocess.run(
+        [
+            "docker",
+            "exec",
+            "-it",
+            "systemd-centos",
+            "bash",
+            "-c",
+            "sudo dnf remove -y nginx",
+        ]
+    )
+    subprocess.run(
+        [
+            "docker",
+            "exec",
+            "-it",
+            "systemd-centos",
+            "bash",
+            "-c",
+            "sudo dnf autoremove -y",
+        ]
+    )
     subprocess.run(
         [
             "docker",