diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index fc7086da9..8df2bee22 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -115,6 +115,9 @@ jobs:
         # see https://github.com/iiasa/ixmp/issues/534
         pip install "pint != 0.24.0" "numpy < 2"
 
+        # TEMPORARY Work around pretenders/pretenders#153
+        pip install "bottle < 0.13"
+
     - name: Install R dependencies and tutorial requirements
       run: |
         install.packages(c("remotes", "Rcpp"))