diff --git a/.gitignore b/.gitignore
index 3389182..9a5b22a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,5 @@ tmp*
 vendor/bundle
 *.zip
 mkdocs.yml
+.aider*
+.env
diff --git a/docker/Dockerfile b/docker/Dockerfile
index b48f34c..86d42a9 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -2,7 +2,7 @@ FROM node:18-bookworm-slim
 LABEL maintainer="Glenn ROLLAND glenux@glenux.net"
 
 RUN apt-get update \
- && apt-get install -y --no-install-recommends python3 python3-pip pipenv \
+ && apt-get install -y --no-install-recommends python3 python3-pip pipenv python3-pypandoc \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log
@@ -16,7 +16,7 @@ RUN apt-get update \
 
 # Tools for building pdfs
 RUN apt-get update \
- && apt-get install -y --no-install-recommends make pdftk m4 chromium \
+ && apt-get install -y --no-install-recommends make m4 chromium pandoc ghc libghc-pandoc-dev lmodern texlive-latex-recommended texlive-latex-base texlive-latex-extra \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log
@@ -24,7 +24,7 @@ RUN apt-get update \
 # External tools
 # yq => manage YML
 RUN curl -sSL -o /usr/local/bin/yq \
-         https://github.com/mikefarah/yq/releases/download/v4.18.1/yq_linux_amd64 \
+         https://github.com/mikefarah/yq/releases/download/v4.44.6/yq_linux_amd64 \
  && chmod +x /usr/local/bin/yq
 
 COPY . /app
diff --git a/tasks/docs.mk b/tasks/docs.mk
index a8ddcf4..370ca0a 100644
--- a/tasks/docs.mk
+++ b/tasks/docs.mk
@@ -22,6 +22,7 @@ clean: clean-docs
 build-docs-pdf:  ## build pdf docs only
 	mkdir -p $(BUILD_DOCS_DIR)
 	mkdir -p $(CACHE_DOCS_DIR)
+	rm -f $(BUILD_DOCS_DIR)/docs.pdf
 	./utils/docs/build_combined.sh $(DOCS_DIR) $(CACHE_DOCS_DIR)/combined.md
 	./utils/docs/build_metadata.sh mkdocs.yml $(CACHE_DOCS_DIR)/metadata.yml
 	./utils/docs/build_pdf.py $(CACHE_DOCS_DIR)/metadata.yml $(CACHE_DOCS_DIR)/combined.md $(BUILD_DOCS_DIR)/docs.pdf
diff --git a/utils/docs/build_pdf.py b/utils/docs/build_pdf.py
index c497be5..efc732f 100755
--- a/utils/docs/build_pdf.py
+++ b/utils/docs/build_pdf.py
@@ -33,6 +33,10 @@ if os.path.exists(output_file):
     print(f"Output file already exists: {output_file}")
     sys.exit(1)
 
+print(f"Metadata: {metadata_file}")
+print(f"Input: {input_file}")
+print(f"Output: {output_file}")
+
 # Build the pandoc options as a string
 pandoc_cmd = [
     "--toc",
@@ -45,7 +49,8 @@ pandoc_cmd = [
     "-V", "mainfont=DejaVu Serif",
     "-V", "monofont=SauceCodePro Nerd Font",
     "--pdf-engine=pdflatex",
-    "--filter=utils/docs/filter-nobg.hs",
+    "--resource-path=utils/docs",
+    "--filter=./utils/docs/filter-nobg.hs",
 ]
 
 # from glob import glob
@@ -54,7 +59,7 @@ pandoc_cmd = [
 
 # Convert all markdown files in the chapters/ subdirectory.
 pypandoc.convert_file(
-    [input_file],
+    input_file,
     "pdf",
     outputfile=output_file,
     extra_args=pandoc_cmd,
diff --git a/utils/docs/main.tex b/utils/docs/main.tex
index a477538..d0802c6 100644
--- a/utils/docs/main.tex
+++ b/utils/docs/main.tex
@@ -20,9 +20,9 @@
 % Include additional settings from external files
 % \input{inline_code.tex}
 % \input{bullet_styling.tex}
-\input{chapter_breaks.tex}
-\input{blockquote.tex}
-\input{hyperref_setup.tex}
+\input{utils/docs/chapter_breaks.tex}
+\input{utils/docs/blockquote.tex}
+\input{utils/docs/hyperref_setup.tex}
 
 % Font settings using fontspec
 % \usepackage{fontspec}