diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9e05525..ea48d06 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,4 +9,4 @@ jobs:
       - uses: actions/checkout@v2
       - uses: YosysHQ/setup-oss-cad-suite@v1
       - name: Run checks
-        run: make ci
+        run: tabbypip install xmlschema && make ci
diff --git a/tests/Makefile b/tests/Makefile
index 4b8ac35..9370991 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -14,4 +14,4 @@ test_%: %.sby FORCE
 	python3 ../sbysrc/sby.py -f $<
 
 $(JUNIT_TESTS): $(SBY_TESTS)
-	python validate_junit.py $@/$@.xml
+	python3 validate_junit.py $@/$@.xml