diff --git a/.github/workflows/simple-program-linux.yml b/.github/workflows/simple-program-linux.yml
index f4be27ef..8303bbfa 100644
--- a/.github/workflows/simple-program-linux.yml
+++ b/.github/workflows/simple-program-linux.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/simple-program-macos.yml b/.github/workflows/simple-program-macos.yml
index 9eac1ce3..05807633 100644
--- a/.github/workflows/simple-program-macos.yml
+++ b/.github/workflows/simple-program-macos.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/simple-program-windows.yml b/.github/workflows/simple-program-windows.yml
index b3341a79..d83a7db8 100644
--- a/.github/workflows/simple-program-windows.yml
+++ b/.github/workflows/simple-program-windows.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/system-monitor-linux.yml b/.github/workflows/system-monitor-linux.yml
index 659609eb..ed614cb0 100644
--- a/.github/workflows/system-monitor-linux.yml
+++ b/.github/workflows/system-monitor-linux.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
         theme: [ "3.5inchTheme2" ]
 
     steps:
diff --git a/.github/workflows/system-monitor-macos.yml b/.github/workflows/system-monitor-macos.yml
index 488775de..d8631bf6 100644
--- a/.github/workflows/system-monitor-macos.yml
+++ b/.github/workflows/system-monitor-macos.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
         theme: [ "3.5inchTheme2" ]
 
     steps:
diff --git a/.github/workflows/system-monitor-windows.yml b/.github/workflows/system-monitor-windows.yml
index 80ae2ec0..c69daf12 100644
--- a/.github/workflows/system-monitor-windows.yml
+++ b/.github/workflows/system-monitor-windows.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
         theme: [ "3.5inchTheme2" ]
 
     steps:
diff --git a/.github/workflows/themes-screenshot-on-pr.yml b/.github/workflows/themes-screenshot-on-pr.yml
index 8c58fb98..76401c27 100644
--- a/.github/workflows/themes-screenshot-on-pr.yml
+++ b/.github/workflows/themes-screenshot-on-pr.yml
@@ -10,10 +10,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python 3.10
+    - name: Set up Python 3.x
       uses: actions/setup-python@v5
       with:
-        python-version: "3.11"
+        python-version: "3.13"
 
     - name: Install dependencies
       run: |
diff --git a/.github/workflows/themes-screenshot-on-push.yml b/.github/workflows/themes-screenshot-on-push.yml
index 3ec49557..1c023337 100644
--- a/.github/workflows/themes-screenshot-on-push.yml
+++ b/.github/workflows/themes-screenshot-on-push.yml
@@ -21,10 +21,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python 3.10
+    - name: Set up Python 3.x
       uses: actions/setup-python@v5
       with:
-        python-version: "3.11"
+        python-version: "3.13"
 
     - name: Install dependencies
       run: |
diff --git a/README.md b/README.md
index ffbfd6e0..bb3b0dc6 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This project is an open-source alternative software, NOT the original software p
 * for other smart screens, contact your reseller
 ---
 
-![Linux](https://img.shields.io/badge/Linux-FCC624?style=for-the-badge&logo=linux&logoColor=black) ![Windows](https://img.shields.io/badge/Windows-0078D6?style=for-the-badge&logo=windows&logoColor=white) ![macOS](https://img.shields.io/badge/mac%20os-000000?style=for-the-badge&logo=apple&logoColor=white) ![Raspberry Pi](https://img.shields.io/badge/Raspberry%20Pi-A22846?style=for-the-badge&logo=Raspberry%20Pi&logoColor=white) ![Python](https://img.shields.io/badge/Python-3.8/3.12-3670A0?style=for-the-badge&logo=python&logoColor=ffdd54) [![Licence](https://img.shields.io/github/license/mathoudebine/turing-smart-screen-python?style=for-the-badge)](./LICENSE)
+![Linux](https://img.shields.io/badge/Linux-FCC624?style=for-the-badge&logo=linux&logoColor=black) ![Windows](https://img.shields.io/badge/Windows-0078D6?style=for-the-badge&logo=windows&logoColor=white) ![macOS](https://img.shields.io/badge/mac%20os-000000?style=for-the-badge&logo=apple&logoColor=white) ![Raspberry Pi](https://img.shields.io/badge/Raspberry%20Pi-A22846?style=for-the-badge&logo=Raspberry%20Pi&logoColor=white) ![Python](https://img.shields.io/badge/Python-3.8/3.13-3670A0?style=for-the-badge&logo=python&logoColor=ffdd54) [![Licence](https://img.shields.io/github/license/mathoudebine/turing-smart-screen-python?style=for-the-badge)](./LICENSE)
   
 
 A Python system monitor program and an abstraction library for **small IPS USB-C (UART) displays.**    
diff --git a/library/stats.py b/library/stats.py
index 375f1b6c..d904be74 100644
--- a/library/stats.py
+++ b/library/stats.py
@@ -476,8 +476,8 @@ def stats(cls):
 
         # GPU mem. total memory (M)
         gpu_mem_total_text_data = theme_gpu_data['MEMORY_TOTAL']['TEXT']
-        if math.isnan(memory_used_mb):
-            memory_used_mb = 0
+        if math.isnan(total_memory_mb):
+            total_memory_mb = 0
             if gpu_mem_total_text_data['SHOW']:
                 logger.warning("Your GPU total memory capacity (M) is not supported yet")
                 gpu_mem_total_text_data['SHOW'] = False