diff --git a/Dockerfile b/Dockerfile
index ca01ce27..59fe7945 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,8 @@ RUN apt-get update && apt-get install -y \
     curl \
     libreoffice \
     fontconfig \
-    chromium
+    chromium \
+    zstd
 
 
 # Install Node.js 20 using NodeSource repository
diff --git a/Dockerfile.dev b/Dockerfile.dev
index 7f168f4a..873e5355 100644
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@@ -6,7 +6,8 @@ RUN apt-get update && apt-get install -y \
   curl \
   libreoffice \
   fontconfig \
-  chromium
+  chromium \
+  zstd
 
 # Install Node.js 20 using NodeSource repository
 RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
@@ -24,7 +25,7 @@ ENV TEMP_DIRECTORY=/tmp/presenton
 ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium
 
 # Install ollama
-# RUN curl -fsSL http://ollama.com/install.sh | sh
+RUN curl -fsSL http://ollama.com/install.sh | sh
 
 # Install dependencies for FastAPI
 RUN pip install aiohttp aiomysql aiosqlite asyncpg fastapi[standard] \
diff --git a/README.md b/README.md
index 9a7f8f16..66a16dcd 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ Presenton gives you complete control over your AI presentation workflow. Choose
 - ✅ **Fully Open-Source** — Apache 2.0 licensed, inspect, modify, and contribute
 - ✅ **Docker Ready** — One-command deployment with GPU support for local models
 - ✅ **Electron Desktop App** — Run Presenton as a native desktop application on Windows, macOS, and Linux (no browser required)
+- ✅ **Sign in with ChatGPT** — Use your free or paid ChatGPT account to sign in and start creating presentations instantly — no separate API key required
 
 ## Presenton Cloud
 
@@ -68,7 +69,7 @@ You can run Presenton in two ways: **Docker** for a one-command setup without in
 ##### Linux/MacOS (Bash/Zsh Shell):
 
 ```bash
-docker run -it --name presenton -p 5000:80 -v "./app_data:/app_data" ghcr.io/presenton/presenton:latest
+docker run -it --name presenton -p 5000:80  -v "./app_data:/app_data" ghcr.io/presenton/presenton:latest
 ```
 
 ##### Windows (PowerShell):
@@ -83,6 +84,22 @@ Open http://localhost:5000 on browser of your choice to use Presenton.
 
 > **Note: You can replace 5000 with any other port number of your choice to run Presenton on a different port number.**
 
+#### (Optional) Enable Codex Auth — Sign in with ChatGPT
+
+If you want to sign in with your free or paid ChatGPT account, also expose port `1455` for Codex auth support:
+
+##### Linux/MacOS:
+
+```bash
+docker run -it --name presenton -p 5000:80 -p 1455:1455 -v "./app_data:/app_data" ghcr.io/presenton/presenton:latest
+```
+
+##### Windows (PowerShell):
+
+```bash
+docker run -it --name presenton -p 5000:80 -p 1455:1455 -v "${PWD}\app_data:/app_data" ghcr.io/presenton/presenton:latest
+```
+
 ### Option 2: Electron (Desktop App)
 
 Run Presenton as a native desktop application. LLM and image provider (API keys, etc.) can be configured in the app; the same environment variables used for Docker apply when running the bundled backend.