diff --git a/.gitignore b/.gitignore
index 3249754..605534e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 *.jar
 *.swp
 .*.done.log
-.check-*.ttl
 .venv-pre-commit
 __pycache__
 venv
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 456abf6..0c82e1c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ repos:
     hooks:
       - id: black
   - repo: https://github.com/pycqa/flake8
-    rev: 7.0.0
+    rev: 7.1.0
     hooks:
       - id: flake8
   - repo: https://github.com/pycqa/isort
@@ -12,3 +12,9 @@ repos:
     hooks:
       - id: isort
         name: isort (python)
+  - repo: https://github.com/casework/rdf-toolkit-action
+    rev: 2.0.3
+    hooks:
+      - id: rdf-toolkit-normalizer
+        args:
+          - --autofix
diff --git a/ontology/Makefile b/ontology/Makefile
index eb66903..8d6b662 100644
--- a/ontology/Makefile
+++ b/ontology/Makefile
@@ -20,37 +20,11 @@ top_srcdir := $(shell cd .. ; pwd)
 
 uco_srcdir := $(top_srcdir)/dependencies/CDO-Shapes-BFO/dependencies/UCO
 
-RDF_TOOLKIT_JAR := $(uco_srcdir)/lib/rdf-toolkit.jar
-
 ttl_basenames := $(wildcard uco-*.ttl)
 
-check_ttl_targets := $(foreach ttl_basename,$(ttl_basenames),check-$(ttl_basename))
-
 all: \
   catalog-v001.xml
 
-.PHONY: \
-  check-%.ttl
-
-.PRECIOUS: \
-  .check-%.ttl
-
-$(RDF_TOOLKIT_JAR):
-	@echo "DEBUG:ontology/Makefile:top_srcdir=$(top_srcdir)" >&2
-	@echo "ERROR:ontology/Makefile:rdf-toolkit.jar not found.  Did you run `make` from the top source directory?" >&2
-	@test -r $@
-
-.check-%.ttl: \
-  %.ttl \
-  $(RDF_TOOLKIT_JAR)
-	java -jar $(RDF_TOOLKIT_JAR) \
-	  --inline-blank-nodes \
-	  --source $< \
-	  --source-format turtle \
-	  --target _$@ \
-	  --target-format turtle
-	mv _$@ $@
-
 catalog-v001.xml: \
   $(top_srcdir)/.venv.done.log \
   $(top_srcdir)/etc/domain_directories.tsv \
@@ -69,15 +43,8 @@ catalog-v001.xml: \
 	mv _$@ $@
 
 check: \
-  $(check_ttl_targets) \
   catalog-v001.xml
 
-check-%.ttl: \
-  %.ttl \
-  .check-%.ttl
-	diff $^	\
-	  || (echo "ERROR:ontology/Makefile:The local $< does not match the normalized version. If the above reported changes look fine, run 'cp .check-$< $<' while in the sub-folder ontology/ to get a file ready to commit to Git." >&2 ; exit 1)
-
 clean:
 	@rm -f \
 	  _* \