diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7f23c645b6c5234d8563b30b2339c4e6870081dd..4af7fc584856d9f45fc5f465d1e174041fc7f2bd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ Pytest:
     # AK, 2020-12-13
     rm pytools/mpiwrap.py
 
-    export EXTRA_INSTALL="numpy"
+    export EXTRA_INSTALL="numpy siphash24"
     curl -L -O https://gitlab.tiker.net/inducer/ci-support/raw/main/build-and-test-py-project.sh
     . ./build-and-test-py-project.sh
   tags:
@@ -17,6 +17,7 @@ Pytest:
 
 Pytest without Numpy:
   script: |
+    EXTRA_INSTALL="siphash24"
     rm pytools/{convergence,spatial_btree,obj_array,mpiwrap}.py
     curl -L -O https://gitlab.tiker.net/inducer/ci-support/raw/main/build-and-test-py-project.sh
     . ./build-and-test-py-project.sh
@@ -60,7 +61,7 @@ Mypy:
 
 Pylint:
   script:
-  - EXTRA_INSTALL="numpy pymbolic orderedsets"
+  - EXTRA_INSTALL="numpy pymbolic orderedsets siphash24"
   - py_version=3
   - curl -L -O https://gitlab.tiker.net/inducer/ci-support/raw/main/prepare-and-run-pylint.sh
   - . ./prepare-and-run-pylint.sh "$CI_PROJECT_NAME"
@@ -71,7 +72,7 @@ Pylint:
 
 Documentation:
   script:
-  - EXTRA_INSTALL="numpy"
+  - EXTRA_INSTALL="numpy siphash24"
   - curl -L -O https://gitlab.tiker.net/inducer/ci-support/raw/main/build-docs.sh
   - ". ./build-docs.sh"
   tags: