diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8eaa2b8..575531a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,13 +39,13 @@ jobs:
       coverage: codecov
       posargs: -n auto
       libraries: |
-        apt:
+        choco:
           - ffmpeg
         brew:
           - ffmpeg
       envs: |
         - windows: py310
-        - macos: py39-oldestdeps
+        - macos: py39
 
   docs:
     needs: [core]
diff --git a/.gitignore b/.gitignore
index e5ad27f..ff58272 100644
--- a/.gitignore
+++ b/.gitignore
@@ -210,6 +210,7 @@ docs/generated
 docs/sg_execution_times.rst
 docs/whatsnew/latest_changelog.txt
 irispy/_version.py
+.sourcery.yaml
 
 ### Pycharm(?)
 .idea
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7f1f832..f74f7d9 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,12 +11,12 @@ repos:
         args: ['--in-place', '--remove-all-unused-imports', '--remove-unused-variable']
         exclude: ".*(.fits|.fts|.fit|.txt|tca.*|extern.*|.rst|.md|docs/conf.py)$"
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: 'v0.1.8'
+    rev: 'v0.1.9'
     hooks:
       - id: ruff
         args: ['--fix', '--unsafe-fixes']
   -   repo: https://github.com/psf/black
-      rev: 23.12.0
+      rev: 23.12.1
       hooks:
       - id: black
         exclude: ".*(.fits|.fts|.fit|.txt|.csv)$"
diff --git a/irispy/data/test/compress.py b/irispy/data/test/compress.py
index 86bd341..8c73cd4 100644
--- a/irispy/data/test/compress.py
+++ b/irispy/data/test/compress.py
@@ -28,14 +28,14 @@ def compress(files: list) -> None:
                 continue
             if hdu.data.ndim == 2:
                 factor = (0.1, 1)
-            if hdu.data.ndim == 3:
+            elif hdu.data.ndim == 3:
                 factor = (0.1, 0.1, 0.1)
             hdu.data = zoom(hdu.data, factor, order=0)
-            if hdu.data.ndim == 3:
-                hdu.header["NAXIS1"] = hdu.data.shape[2]
-                hdu.header["NAXIS2"] = hdu.data.shape[1]
-                hdu.header["NAXIS3"] = hdu.data.shape[0]
             if hdu.data.ndim == 2:
                 hdu.header["NAXIS1"] = hdu.data.shape[1]
                 hdu.header["NAXIS2"] = hdu.data.shape[0]
+            elif hdu.data.ndim == 3:
+                hdu.header["NAXIS1"] = hdu.data.shape[2]
+                hdu.header["NAXIS2"] = hdu.data.shape[1]
+                hdu.header["NAXIS3"] = hdu.data.shape[0]
         hdus.writeto(f"{file.split('.fits')[0]}_test.fits", overwrite=True)
diff --git a/irispy/spectrograph.py b/irispy/spectrograph.py
index 0e2ef95..bd58467 100644
--- a/irispy/spectrograph.py
+++ b/irispy/spectrograph.py
@@ -187,7 +187,7 @@ def convert_to(self, new_unit_type, time_obs=None, response_version=4):
             # Get wavelength for each pixel.
             obs_wavelength = self.axis_world_coords(2)
 
-        if new_unit_type == "DN" or new_unit_type == "photons":
+        if new_unit_type in ["DN", "photons"]:
             if self.unit.is_equivalent(utils.RADIANCE_UNIT):
                 # Convert from radiance to counts/s
                 new_data_quantities = utils.convert_or_undo_photons_per_sec_to_radiance(
@@ -212,10 +212,7 @@ def convert_to(self, new_unit_type, time_obs=None, response_version=4):
                     mask=self.mask,
                 )
                 self._extra_coords = self.extra_coords
-            if new_unit_type == "DN":
-                new_unit = utils.DN_UNIT[detector_type]
-            else:
-                new_unit = u.photon
+            new_unit = utils.DN_UNIT[detector_type] if new_unit_type == "DN" else u.photon
             new_data_arrays, new_unit = utils.convert_between_DN_and_photons(
                 (self.data, self.uncertainty.array),
                 self.unit,
diff --git a/tox.ini b/tox.ini
index cd7ede8..e6d5e3b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{39,310,311}{,-oldestdeps,-devdeps,-online}
+    py{39,310,311}{,-devdeps,-online}
     build_docs
     codestyle
 isolated_build = true
@@ -13,7 +13,6 @@ changedir = .tmp/{envname}
 description =
     run tests
     devdeps: with the latest developer version of key dependencies
-    oldestdeps: with the oldest supported version of key dependencies
     online: that require remote data
 setenv =
     MPLBACKEND = agg
@@ -27,8 +26,6 @@ deps =
     # The devdeps factor is intended to be used to install the latest developer version of key dependencies.
     devdeps: git+https://github.com/sunpy/sunraster
     devdeps: git+https://github.com/sunpy/ndcube
-    # Oldest deps we pin against.
-    oldestdeps: sunraster<0.5
     # These are specific online extras we use to run the online tests.
     online: pytest-rerunfailures
     online: pytest-timeout