diff --git a/Dockerfile b/Dockerfile
index 79cde5d..29edabe 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ COPY frontend/ .
 RUN npm run build
 
 # Stage 2: Build the backend
-FROM python:3.9-slim
+FROM python:3.10-slim
 WORKDIR /app
 
 # Install system dependencies
diff --git a/cline_docs/activeContext.md b/cline_docs/activeContext.md
index 541ebe5..f295733 100644
--- a/cline_docs/activeContext.md
+++ b/cline_docs/activeContext.md
@@ -8,6 +8,7 @@
 
 ## Recent Changes
 - Fixed Docker containerization issues:
+  - Updated Python from 3.9 to 3.10 in Dockerfile (OCRmyPDF 16.10.0 requires Python ≥3.10)
   - Updated Dockerfile to use OCRmyPDF 16.10.0 (matching requirements.txt)
   - Added pikepdf 9.5.2 to Dockerfile (was missing but in requirements.txt)
   - Added version '3.8' to docker-compose.yml
diff --git a/cline_docs/progress.md b/cline_docs/progress.md
index 9dceca6..597e5e2 100644
--- a/cline_docs/progress.md
+++ b/cline_docs/progress.md
@@ -87,6 +87,7 @@
 - Overall Progress: ~85% complete
 
 ## Recent Changes
+- ✅ Fixed: Docker containerization issues resolved (upgraded to Python 3.10, version mismatch, missing dependencies, Docker Compose configuration)
 - ✅ Removed: TxtToPdf functionality has been completely removed from the application as it's no longer needed
 
 ## Known Issues