diff --git a/.cookietemple.yml b/.cookietemple.yml
index ed53147..ee4bb20 100644
--- a/.cookietemple.yml
+++ b/.cookietemple.yml
@@ -15,5 +15,5 @@ full_name: Victor Giurcoiu
 email: victor.giurcoiu@tum.de
 project_name: spectrum_fundamentals
 project_short_description: Fundamentals public repo
-version: 0.5.3
+version: 0.5.4
 license: MIT
diff --git a/.github/release-drafter.yml b/.github/release-drafter.yml
index 92c4010..6155efa 100644
--- a/.github/release-drafter.yml
+++ b/.github/release-drafter.yml
@@ -1,5 +1,5 @@
-name-template: "0.5.3 🌈" # <<COOKIETEMPLE_FORCE_BUMP>>
-tag-template: 0.5.3 # <<COOKIETEMPLE_FORCE_BUMP>>
+name-template: "0.5.4 🌈" # <<COOKIETEMPLE_FORCE_BUMP>>
+tag-template: 0.5.4 # <<COOKIETEMPLE_FORCE_BUMP>>
 exclude-labels:
     - "skip-changelog"
 
diff --git a/.github/workflows/build_package.yml b/.github/workflows/build_package.yml
index f9d2ff1..f532e3a 100644
--- a/.github/workflows/build_package.yml
+++ b/.github/workflows/build_package.yml
@@ -12,7 +12,7 @@ jobs:
                 python: [3.8, 3.9]
 
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@v4
               name: Check out source-code repository
 
             - name: Setup Python
diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
index 8ea1f8f..825aa6f 100644
--- a/.github/workflows/labeler.yml
+++ b/.github/workflows/labeler.yml
@@ -11,7 +11,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Check out the repository
-              uses: actions/checkout@v2.3.3
+              uses: actions/checkout@v4
 
             - name: Run Labeler
               uses: crazy-max/ghaction-github-labeler@v5.0.0
diff --git a/.github/workflows/publish_docs.yml b/.github/workflows/publish_docs.yml
index 6f00229..298307f 100644
--- a/.github/workflows/publish_docs.yml
+++ b/.github/workflows/publish_docs.yml
@@ -7,7 +7,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v2
+            - uses: actions/checkout@v4
               name: Check out source-code repository
 
             - name: Setup Python
@@ -30,7 +30,7 @@ jobs:
 
             - name: Deploy
               if: ${{ github.ref == 'refs/heads/master' || github.ref == 'refs/heads/main'}}
-              uses: peaceiris/actions-gh-pages@v3
+              uses: peaceiris/actions-gh-pages@v4
               with:
                   github_token: ${{ secrets.GITHUB_TOKEN }}
                   publish_dir: ./docs/_build/html
diff --git a/.github/workflows/publish_package.yml b/.github/workflows/publish_package.yml
index 19c7e0b..86a36c4 100644
--- a/.github/workflows/publish_package.yml
+++ b/.github/workflows/publish_package.yml
@@ -10,7 +10,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Check out the repository
-              uses: actions/checkout@v2.3.4
+              uses: actions/checkout@v4
               with:
                   fetch-depth: 2
 
diff --git a/.github/workflows/run_cookietemple_lint.yml b/.github/workflows/run_cookietemple_lint.yml
index c3d0fbc..0631a28 100644
--- a/.github/workflows/run_cookietemple_lint.yml
+++ b/.github/workflows/run_cookietemple_lint.yml
@@ -7,7 +7,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v2
+            - uses: actions/checkout@v4
               name: Check out source-code repository
 
             - name: Setup Python
diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index 63040a2..020c5f0 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -69,7 +69,7 @@ jobs:
 
         steps:
             - name: Check out the repository
-              uses: actions/checkout@v2.3.4
+              uses: actions/checkout@v4
 
             - name: Set up Python ${{ matrix.python-version }}
               uses: actions/setup-python@v5.1.0
@@ -116,15 +116,15 @@ jobs:
               run: nox --force-color --python=${{ matrix.python-version }}
 
             - name: Upload coverage data
-              if: always() && matrix.session == 'tests'
-              uses: actions/upload-artifact@v3
+              if: always() && matrix.session == 'tests' && matrix.os == 'ubuntu-latest'
+              uses: actions/upload-artifact@v4
               with:
                   name: coverage-data
                   path: ".coverage.*"
 
             - name: Upload documentation
               if: matrix.session == 'docs-build'
-              uses: actions/upload-artifact@v3
+              uses: actions/upload-artifact@v4
               with:
                   name: docs
                   path: docs/_build
@@ -134,7 +134,7 @@ jobs:
         needs: tests
         steps:
             - name: Check out the repository
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Set up Python 3.8
               uses: actions/setup-python@v5.1.0
@@ -154,7 +154,7 @@ jobs:
                   nox --version
 
             - name: Download coverage data
-              uses: actions/download-artifact@v3
+              uses: actions/download-artifact@v4
               with:
                   name: coverage-data
 
diff --git a/.github/workflows/sync_project.yml b/.github/workflows/sync_project.yml
index e0f4e02..0ff8eaf 100644
--- a/.github/workflows/sync_project.yml
+++ b/.github/workflows/sync_project.yml
@@ -17,7 +17,7 @@ jobs:
             - name: Install cookietemple
               run: pip install cookietemple
 
-            - uses: actions/checkout@v2
+            - uses: actions/checkout@v4
               with:
                   fetch-depth: 0
                   token: "${{ secrets.CT_SYNC_TOKEN }}"
diff --git a/cookietemple.cfg b/cookietemple.cfg
index 0e603e0..cba6928 100644
--- a/cookietemple.cfg
+++ b/cookietemple.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.5.3
+current_version = 0.5.4
 
 [bumpversion_files_whitelisted]
 init_file = spectrum_fundamentals/__init__.py
diff --git a/docs/conf.py b/docs/conf.py
index 40dc1a8..6d899ce 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -54,9 +54,9 @@
 # the built documents.
 #
 # The short X.Y version.
-version = "0.5.3"
+version = "0.5.4"
 # The full version, including alpha/beta/rc tags.
-release = "0.5.3"
+release = "0.5.4"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/poetry.lock b/poetry.lock
index 6d66718..6d00c02 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -101,33 +101,33 @@ yaml = ["PyYAML"]
 
 [[package]]
 name = "black"
-version = "24.3.0"
+version = "24.4.2"
 description = "The uncompromising code formatter."
 optional = false
 python-versions = ">=3.8"
 files = [
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 ]
 
 [package.dependencies]
@@ -1381,38 +1381,36 @@ files = [
 
 [[package]]
 name = "pandas"
-version = "1.5.3"
+version = "2.0.3"
 description = "Powerful data structures for data analysis, time series, and statistics"
 optional = false
 python-versions = ">=3.8"
 files = [
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+    {file = "pandas-2.0.3-cp39-cp39-win_amd64.whl", hash = "sha256:1168574b036cd8b93abc746171c9b4f1b83467438a5e45909fed645cf8692dbc"},
+    {file = "pandas-2.0.3.tar.gz", hash = "sha256:c02f372a88e0d17f36d3093a644c73cfc1788e876a7c4bcb4020a77512e2043c"},
 ]
 
 [package.dependencies]
@@ -1420,11 +1418,32 @@ numpy = [
     {version = ">=1.20.3", markers = "python_version < \"3.10\""},
     {version = ">=1.21.0", markers = "python_version >= \"3.10\""},
 ]
-python-dateutil = ">=2.8.1"
+python-dateutil = ">=2.8.2"
 pytz = ">=2020.1"
+tzdata = ">=2022.1"
 
 [package.extras]
-test = ["hypothesis (>=5.5.3)", "pytest (>=6.0)", "pytest-xdist (>=1.31)"]
+all = ["PyQt5 (>=5.15.1)", "SQLAlchemy (>=1.4.16)", "beautifulsoup4 (>=4.9.3)", "bottleneck (>=1.3.2)", "brotlipy (>=0.7.0)", "fastparquet (>=0.6.3)", "fsspec (>=2021.07.0)", "gcsfs (>=2021.07.0)", "html5lib (>=1.1)", "hypothesis (>=6.34.2)", "jinja2 (>=3.0.0)", "lxml (>=4.6.3)", "matplotlib (>=3.6.1)", "numba (>=0.53.1)", "numexpr (>=2.7.3)", "odfpy (>=1.4.1)", "openpyxl (>=3.0.7)", "pandas-gbq (>=0.15.0)", "psycopg2 (>=2.8.6)", "pyarrow (>=7.0.0)", "pymysql (>=1.0.2)", "pyreadstat (>=1.1.2)", "pytest (>=7.3.2)", "pytest-asyncio (>=0.17.0)", "pytest-xdist (>=2.2.0)", "python-snappy (>=0.6.0)", "pyxlsb (>=1.0.8)", "qtpy (>=2.2.0)", "s3fs (>=2021.08.0)", "scipy (>=1.7.1)", "tables (>=3.6.1)", "tabulate (>=0.8.9)", "xarray (>=0.21.0)", "xlrd (>=2.0.1)", "xlsxwriter (>=1.4.3)", "zstandard (>=0.15.2)"]
+aws = ["s3fs (>=2021.08.0)"]
+clipboard = ["PyQt5 (>=5.15.1)", "qtpy (>=2.2.0)"]
+compression = ["brotlipy (>=0.7.0)", "python-snappy (>=0.6.0)", "zstandard (>=0.15.2)"]
+computation = ["scipy (>=1.7.1)", "xarray (>=0.21.0)"]
+excel = ["odfpy (>=1.4.1)", "openpyxl (>=3.0.7)", "pyxlsb (>=1.0.8)", "xlrd (>=2.0.1)", "xlsxwriter (>=1.4.3)"]
+feather = ["pyarrow (>=7.0.0)"]
+fss = ["fsspec (>=2021.07.0)"]
+gcp = ["gcsfs (>=2021.07.0)", "pandas-gbq (>=0.15.0)"]
+hdf5 = ["tables (>=3.6.1)"]
+html = ["beautifulsoup4 (>=4.9.3)", "html5lib (>=1.1)", "lxml (>=4.6.3)"]
+mysql = ["SQLAlchemy (>=1.4.16)", "pymysql (>=1.0.2)"]
+output-formatting = ["jinja2 (>=3.0.0)", "tabulate (>=0.8.9)"]
+parquet = ["pyarrow (>=7.0.0)"]
+performance = ["bottleneck (>=1.3.2)", "numba (>=0.53.1)", "numexpr (>=2.7.1)"]
+plot = ["matplotlib (>=3.6.1)"]
+postgresql = ["SQLAlchemy (>=1.4.16)", "psycopg2 (>=2.8.6)"]
+spss = ["pyreadstat (>=1.1.2)"]
+sql-other = ["SQLAlchemy (>=1.4.16)"]
+test = ["hypothesis (>=6.34.2)", "pytest (>=7.3.2)", "pytest-asyncio (>=0.17.0)", "pytest-xdist (>=2.2.0)"]
+xml = ["lxml (>=4.6.3)"]
 
 [[package]]
 name = "pathspec"
@@ -2629,6 +2648,17 @@ files = [
     {file = "typing_extensions-4.11.0.tar.gz", hash = "sha256:83f085bd5ca59c80295fc2a82ab5dac679cbe02b9f33f7d83af68e241bea51b0"},
 ]
 
+[[package]]
+name = "tzdata"
+version = "2024.1"
+description = "Provider of IANA time zone data"
+optional = false
+python-versions = ">=2"
+files = [
+    {file = "tzdata-2024.1-py2.py3-none-any.whl", hash = "sha256:9068bc196136463f5245e51efda838afa15aaeca9903f49050dfa2679db4d252"},
+    {file = "tzdata-2024.1.tar.gz", hash = "sha256:2674120f8d891909751c38abcdfd386ac0a5a1127954fbc332af6b5ceae07efd"},
+]
+
 [[package]]
 name = "urllib3"
 version = "2.2.1"
@@ -2711,4 +2741,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.0,<3.11.0"
-content-hash = "d200011cd83d83ad3e0a834c204c8b1e20f45505d64ad420b5478b81482fcbf7"
+content-hash = "5e4a9a13a03f8477623414c069175c240e08d1d7d7028c6acf9c536a1e6843bf"
diff --git a/pyproject.toml b/pyproject.toml
index dc91110..d31ee05 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "spectrum_fundamentals"
-version = "0.5.3"  # <<COOKIETEMPLE_FORCE_BUMP>>
+version = "0.5.4"  # <<COOKIETEMPLE_FORCE_BUMP>>
 description = "Fundamental functions, annotation pipeline and constants for oktoberfest"
 authors = ["Wilhelmlab at Technical University of Munich"]
 license = "MIT"
@@ -25,7 +25,7 @@ click = ">=8.0.0"
 rich = ">=10.3.0"
 PyYAML = ">=5.4.1"
 numpy = ">=1.24.1,<1.25"
-pandas = "^1.3.0"
+pandas = ">=1.3,<3.0"
 scikit-learn = "^1.0"
 joblib = "^1.0.1"
 moepy = "^1.1.4"
diff --git a/spectrum_fundamentals/__init__.py b/spectrum_fundamentals/__init__.py
index d396ea1..dd63b99 100644
--- a/spectrum_fundamentals/__init__.py
+++ b/spectrum_fundamentals/__init__.py
@@ -2,7 +2,7 @@
 
 __author__ = "Mario Picciani"
 __email__ = "mario.picciani@tum.de"
-__version__ = "0.5.3"
+__version__ = "0.5.4"
 
 import logging
 import logging.handlers
diff --git a/spectrum_fundamentals/__main__.py b/spectrum_fundamentals/__main__.py
index 57966c0..0924b65 100644
--- a/spectrum_fundamentals/__main__.py
+++ b/spectrum_fundamentals/__main__.py
@@ -5,7 +5,7 @@
 
 
 @click.command()
-@click.version_option(version="0.5.3", message=click.style("spectrum_fundamentals Version: 0.5.3"))
+@click.version_option(version="0.5.4", message=click.style("spectrum_fundamentals Version: 0.5.4"))
 def main() -> None:
     """spectrum_fundamentals."""
 
diff --git a/spectrum_fundamentals/constants.py b/spectrum_fundamentals/constants.py
index 245168b..5c5678b 100644
--- a/spectrum_fundamentals/constants.py
+++ b/spectrum_fundamentals/constants.py
@@ -244,6 +244,7 @@
     -18.0105: "[UNIMOD:23]",
     57.0215: "[UNIMOD:4]",
     15.9949: "[UNIMOD:35]",
+    15.994: "[UNIMOD:35]",
     42.0105: "[UNIMOD:1]",
 }
 # these are only used for prosit_grpc, oktoberfest uses the masses from MOD_MASSES