diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index adcad51..0288fe2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,4 +26,5 @@ jobs:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
 
-      - run: make test-gha
+      - name: Create data environment
+        run: make test-gha
diff --git a/Makefile b/Makefile
index 7f9915f..c9503bb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,7 @@
 OBO = http://purl.obolibrary.org/obo
 
+OWLTOOLS_MEMORY ?= 8G
+
 all: target all_obo neo.obo neo.owl
 
 clean:
@@ -30,7 +32,7 @@ trigger:
 
 IMPORTS = imports/pr_import.obo
 neo.obo:  $(OBO_SRCS) $(IMPORTS)
-	owltools --create-ontology http://purl.obolibrary.org/obo/go/noctua/neo.owl $^ --merge-support-ontologies  -o -f obo $@.tmp && grep -v ^owl-axioms $@.tmp > $@
+	owltools -Xms$(OWLTOOLS_MEMORY) -Xmx$(OWLTOOLS_MEMORY) --create-ontology http://purl.obolibrary.org/obo/go/noctua/neo.owl $^ --merge-support-ontologies  -o -f obo $@.tmp && grep -v ^owl-axioms $@.tmp > $@
 
 ## datasets.json is created as a throwaway in the NEO versions of the
 ## pipeline and is based on the go-site master data.