diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index 0f3763986f..ee4750452d 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -23,12 +23,12 @@ jobs:
         - { os: windows-latest }
         # Versions of both ixmp and message_ix to use plus latest supported python version
         upstream:
-        - { python-version: "3.11", version: v3.4.0, extra-deps: '"pandas<2.0"' }  # Minimum version given in pyproject.toml
-        - { python-version: "3.11", version: v3.5.0, extra-deps: '"pandas<2.0"' }
-        - { python-version: "3.11", version: v3.6.0, extra-deps: '"pandas<2.0"' }
-        - { python-version: "3.11", version: v3.7.0, extra-deps: "" }
-        - { python-version: "3.12", version: v3.8.0, extra-deps: "" } # Latest released version
-        - { python-version: "3.12", version: main,   extra-deps: "" }  # Development version
+        - { python-version: "3.11", version: v3.4.0, extra-deps: '"genno < 1.25" "pandas < 2.0"' }  # Minimum version given in pyproject.toml
+        - { python-version: "3.11", version: v3.5.0, extra-deps: '"genno < 1.25" "pandas < 2.0"' }
+        - { python-version: "3.11", version: v3.6.0, extra-deps: '"genno < 1.25" "pandas < 2.0"' }
+        - { python-version: "3.11", version: v3.7.0, extra-deps: '"genno < 1.25" ' }
+        - { python-version: "3.12", version: v3.8.0, extra-deps: '' } # Latest released version
+        - { python-version: "3.12", version: main,   extra-deps: '' }  # Development version
 
       fail-fast: false