diff --git a/scripts/ci/build_matrix.sh b/scripts/ci/build_matrix.sh
index 491bb59d..0acdb51a 100755
--- a/scripts/ci/build_matrix.sh
+++ b/scripts/ci/build_matrix.sh
@@ -12,10 +12,10 @@
 python_version=("3.9" "3.10" "3.11" "3.12")
 os=("ubuntu-latest" "windows-latest" "macos-13" "macos-14")
 # This command fetches the last PyBaMM version excluding release candidates from PyPI
-pybamm_version=($(curl -s https://pypi.org/pypi/pybamm/json | jq -r '.releases | keys[]' | grep -v rc | tail -n 1 | paste -sd " " -))
+pybamm_version=($(curl -s https://pypi.org/pypi/pybamm/json | jq -r '.releases | keys[]' | grep -v rc | sort -V | tail -n 1 | paste -sd " " -))
 
 # This command fetches the last PyBaMM versions including release candidates from PyPI
-#pybamm_version=($(curl -s https://pypi.org/pypi/pybamm/json | jq -r '.releases | keys[]' | tail -n 1 | paste -sd " " -))
+#pybamm_version=($(curl -s https://pypi.org/pypi/pybamm/json | jq -r '.releases | keys[]' | sort -V | tail -n 1 | paste -sd " " -))
 
 # open dict
 json='{