diff --git a/.github/workflows/test_release_conda.yml b/.github/workflows/test_release_conda.yml
index 97a3d6a97..136d91f51 100644
--- a/.github/workflows/test_release_conda.yml
+++ b/.github/workflows/test_release_conda.yml
@@ -36,17 +36,10 @@ jobs:
         shell: bash -el {0}
         env:
           EUPHONIC_VERSION: ${{ inputs.version }}
-          EXTRA_PACKAGES: matplotlib-base pyyaml h5py
-          TESTING_PACKAGES: pytest=7.* coverage pytest-mock pytest-lazy-fixture pytest-xvfb python-slugify
 
         run: |
-          conda install -c conda-forge euphonic=$EUPHONIC_VERSION $EXTRA_PACKAGES $TESTING_PACKAGES
-
-      # - name: Update pip and install testing dependencies
-      #   shell: bash -l {0}
-      #   run: |
-      #     python -m pip install --upgrade pip
-      #     python -m pip install -r tests_and_analysis/ci_requirements.txt
+          conda env update --file build_utils/conda_release_test_requirements.yml
+          conda install -c conda-forge euphonic=$EUPHONIC_VERSION
 
       - name: Run tests
         shell: bash -el {0}
diff --git a/build_utils/conda_release_test_requirements.yml b/build_utils/conda_release_test_requirements.yml
new file mode 100644
index 000000000..89831fed4
--- /dev/null
+++ b/build_utils/conda_release_test_requirements.yml
@@ -0,0 +1,13 @@
+name: conda-release-test
+channels:
+  - conda-forge
+dependencies:
+  - pytest=7.*
+  - coverage
+  - pytest-mock
+  - pytest-lazy-fixture
+  - pytest-xvfb
+  - python-slugify
+  - matplotlib-base
+  - pyyaml
+  - h5py
diff --git a/build_utils/conda_release_tox.ini b/build_utils/conda_release_tox.ini
deleted file mode 100644
index feefb17bf..000000000
--- a/build_utils/conda_release_tox.ini
+++ /dev/null
@@ -1,50 +0,0 @@
-[tox]
-# Use conda to set up the python environments to run in
-requires = tox>=4
-# The python environments to run the tests in
-envlist = py310-old-np,py310,py311,py312
-skip_install = True
-
-[testenv]
-changedir = tests_and_analysis/test
-test_command = python {toxinidir}/../tests_and_analysis/test/run_tests.py --report
-requirements_dir = {toxinidir}/../tests_and_analysis
-passenv =
-    EUPHONIC_VERSION
-# The name "extras" is reserved and has its own format with newlines:
-# we need a token to inject into custom commands_pre, so call it extras_str
-extras_str = [test,matplotlib,phonopy-reader,brille]
-
-[testenv:{py310,py311,py312}]
-whitelist_externals = conda
-install_command = conda install {packages}
-conda_channels =
-    conda-forge
-    default
-extras =
-    test
-    matplotlib
-    phonopy-reader
-
-commands_pre =
-    conda install -c conda-forge euphonic={env:EUPHONIC_VERSION}
-# Brille not available on conda
-commands = {[testenv]test_command} -m "not brille"
-
-# Test against a version of Numpy less than the latest for Conda
-# See https://github.com/conda-forge/euphonic-feedstock/pull/20
-[testenv:py310-old-np]
-whitelist_externals = conda
-install_command = conda install {packages}
-conda_channels =
-    conda-forge
-    default
-deps = numpy==1.24
-extras =
-    test
-    matplotlib
-    phonopy-reader
-commands_pre =
-    conda install -c conda-forge euphonic={env:EUPHONIC_VERSION}
-# Brille not available on conda
-commands = {[testenv]test_command} -m "not brille"