diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 28d58291..eded3c0d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -74,6 +74,6 @@ jobs:
       - name: Run tests
         shell: bash -l {0}
         run: |
-          PYTEST_ARGS="--nbval-lax --nbval-current-env --nbval-cell-timeout=900"
+          PYTEST_ARGS="--nbval-lax --nbval-current-env --nbval-cell-timeout=1800"
           pytest $PYTEST_ARGS