diff --git a/.github/workflows/pr-ci.yml b/.github/workflows/pr-ci.yml
index a98ab5a5..9750343e 100644
--- a/.github/workflows/pr-ci.yml
+++ b/.github/workflows/pr-ci.yml
@@ -16,8 +16,8 @@ jobs:
   test:
     strategy:
       matrix:
-        os: [windows-latest]
-        py3version: ["9", "10"]
+        os: [windows-latest, ubuntu-latest, macos-latest]
+        py3version: ["9", "10", "11"]
       fail-fast: false
     uses: arup-group/actions-city-modelling-lab/.github/workflows/python-install-lint-test.yml@try-python--m-pytest
     with:
diff --git a/requirements/base.txt b/requirements/base.txt
index 32803d4e..74239f25 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,5 +1,5 @@
 click < 9
-gdal >= 3.7, < 3.8
+gdal = 3.8.1
 geopandas >= 0.13, < 0.14
 ipykernel < 7
 lxml < 5