diff --git a/.github/workflows/packages-dl3-irfs.yml b/.github/workflows/packages-dl3-irfs.yml
index ac32622..39c5dc3 100644
--- a/.github/workflows/packages-dl3-irfs.yml
+++ b/.github/workflows/packages-dl3-irfs.yml
@@ -21,12 +21,12 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
         with:
           path: 'Converters'
 
       - name: Log in to the Container registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -34,7 +34,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           tags: |
             type=ref,event=pr,suffix=-dl3-irfs
@@ -42,7 +42,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8770937..49d47e9 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,24 +1,24 @@
 repos:
   # https://pycqa.github.io/isort/docs/configuration/black_compatibility.html#integration-with-pre-commit
   - repo: https://github.com/pycqa/isort
-    rev: 5.12.0
+    rev: 7.0.0
     hooks:
       - id: isort
         args: ["--profile", "black", "--filter-files"]
   - repo: https://github.com/psf/black
-    rev: 23.7.0
+    rev: 25.11.0
     hooks:
       - id: black
         args: ["--line-length=100"]
   # https://black.readthedocs.io/en/stable/guides/using_black_with_other_tools.html?highlight=other%20tools#flake8
   - repo: https://github.com/PyCQA/flake8
-    rev: 6.1.0
+    rev: 7.3.0
     hooks:
       - id: flake8
         args: ["--max-line-length=100", "--extend-ignore=E203,E712"]
   # https://github.com/pre-commit/pre-commit-hooks
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+    rev: v6.0.0
     hooks:
       - id: check-yaml
       - id: trailing-whitespace
diff --git a/DL2/Dockerfile b/DL2/Dockerfile
index 55fcaeb..2dacae3 100644
--- a/DL2/Dockerfile
+++ b/DL2/Dockerfile
@@ -1,31 +1,17 @@
 # Dockerfile to build DL2 Converter for Eventdisplay
-FROM python:3.10-slim
+FROM mambaorg/micromamba:latest
 ENV LC_ALL=C
 
 LABEL maintainer.name="Eventdisplay Team"
 LABEL maintainer.email="gernot.maier@desy.de"
 ENV DEBIAN_FRONTEND=noninteractive
 
-RUN apt-get update && \
-    apt-get -y upgrade && \
-    apt-get install -y --no-install-recommends wget && \
-    apt-get clean && \
-    rm -rf /var/lib/apt/lists/*
-
-ENV PATH /conda/bin:$PATH
-ENV PYTHONPATH=$PYTHONPATH:"/"
-
-COPY Converters/DL2/environment.yml environment.yml
-
-RUN wget --quiet https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O ~/miniconda.sh && \
-    /bin/bash ~/miniconda.sh -b -p /conda && \
-    rm ~/miniconda.sh
-RUN conda env update -n base --file environment.yml && \
-    conda clean --all
-
 WORKDIR /workdir/
 
-SHELL ["/bin/bash", "-c"]
+COPY Converters/DL2/environment.yml /tmp/environment.yml
+
+# Create environment using micromamba
+RUN micromamba install -y -n base -f /tmp/environment.yml && \
+    micromamba clean -a -y
 
-RUN source /root/.bashrc && \
-    conda init bash
+ENV PATH="/opt/conda/bin:$PATH"
diff --git a/DL2/generate_DL2_file.py b/DL2/generate_DL2_file.py
index 743d444..475fe6d 100644
--- a/DL2/generate_DL2_file.py
+++ b/DL2/generate_DL2_file.py
@@ -111,9 +111,7 @@ def cli(filenames, cut_level, debug, output, layout, event_type):
     if event_type > 0:
         logging.info(f"Number of events within event_type file: {len(event_types)}")
         ratio = np.sum(event_types == -1) / len(event_types)
-        logging.info(
-            f"Ratio of training to simulated events: {ratio}"
-        )
+        logging.info(f"Ratio of training to simulated events: {ratio}")
         logging.info(f"len(data_mask): {len(data_mask)}")
         data_mask[data_mask] = event_types == event_type
         if np.sum(data_mask) == 0:
@@ -165,12 +163,12 @@ def cli(filenames, cut_level, debug, output, layout, event_type):
     # Create primary HDU:
     primary_hdu = fits.PrimaryHDU()
     primary_hdu.header["TELESCOP"] = layout, "Telescope and array codename"
-    primary_hdu.header[
-        "COMMENT"
-    ] = "FITS (Flexible Image Transport System) format is defined in 'Astronomy"
-    primary_hdu.header[
-        "COMMENT"
-    ] = "and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H"
+    primary_hdu.header["COMMENT"] = (
+        "FITS (Flexible Image Transport System) format is defined in 'Astronomy"
+    )
+    primary_hdu.header["COMMENT"] = (
+        "and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H"
+    )
 
     # Create HDU
     header = fits.Header()
diff --git a/DL3-IRFs/Dockerfile b/DL3-IRFs/Dockerfile
index a82b73c..eb4723a 100644
--- a/DL3-IRFs/Dockerfile
+++ b/DL3-IRFs/Dockerfile
@@ -1,31 +1,33 @@
 # Dockerfile to build DL3-IRFs Converter for Eventdisplay
-From rootproject/root:6.30.02-ubuntu22.04
+FROM rootproject/root:6.30.02-ubuntu22.04
 ENV LC_ALL=C
 
 LABEL maintainer.name="Eventdisplay Team"
 LABEL maintainer.email="gernot.maier@desy.de"
 
-# force ubunto to use bash for /bin/sh
+# force ubuntu to use bash for /bin/sh
 RUN yes no | dpkg-reconfigure dash
 
 ## Basic packages
-RUN apt-get update && apt-get install -y \
-   git
-RUN apt-get clean
+RUN apt-get update && \
+    apt-get install --no-install-recommends -y git && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
 WORKDIR /data/
-ENV DATA /data/
+ENV DATA=/data/
 
-# Install and compile cfitsio
-RUN wget --quiet http://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio-4.3.1.tar.gz && \
-    tar -xzf cfitsio-4.3.1.tar.gz && \
-    cd cfitsio-4.3.1 && \
+## Install and compile cfitsio from GitHub at tag cfitsio-4.6.3
+RUN git clone https://github.com/HEASARC/cfitsio.git && \
+    cd cfitsio && \
+    git checkout cfitsio-4.6.3 && \
     ./configure --prefix=${DATA}/ && \
     make && \
     make install && \
     make clean && \
-    cd .. && rm -f cfitsio-4.3.1.tar.gz
+    cd .. && rm -rf cfitsio
 
-ENV LD_LIBRARY_PATH "${DATA}/lib:${LD_LIBRARY_PATH}"
+ENV LD_LIBRARY_PATH="${DATA}/lib:${LD_LIBRARY_PATH}"
 
 # Install and compile DL3 converter
 RUN git clone https://github.com/Eventdisplay/Converters.git && \
diff --git a/DL3-IRFs/src/test_cta_file.py b/DL3-IRFs/src/test_cta_file.py
index eccd75d..f756d53 100644
--- a/DL3-IRFs/src/test_cta_file.py
+++ b/DL3-IRFs/src/test_cta_file.py
@@ -1,7 +1,7 @@
 # Test program for OGADF scheme using ogadf_schema
 """
-   usage:  python src/test_cta_file.py <file.fits.gz>
-           (only 3D implemented at this point)
+usage:  python src/test_cta_file.py <file.fits.gz>
+        (only 3D implemented at this point)
 """
 import logging
 import sys
diff --git a/LICENSE b/LICENSE
index 5d05046..5510947 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-Copyright (c) 2020, Eventdisplay
+Copyright (c) 2020-2025, Eventdisplay Developers
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without