diff --git a/shacl/projects/C01-project.ttl b/shacl/projects/C01-project.ttl
index 9a313b6..b0bab9c 100644
--- a/shacl/projects/C01-project.ttl
+++ b/shacl/projects/C01-project.ttl
@@ -1,10 +1,5 @@
-@prefix schema: <http://schema.org/> .
 @prefix sh: <http://www.w3.org/ns/shacl#> .
-@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix regen: <https://schema.regen.network#> .
-@prefix geojson: <https://purl.org/geojson/vocab#> .
-@prefix dash: <http://datashapes.org/dash#> .
-@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 
 regen:C01-Project rdfs:subClassOf regen:Project .
diff --git a/shacl/projects/C02-project.ttl b/shacl/projects/C02-project.ttl
index 5a93364..8557bc6 100644
--- a/shacl/projects/C02-project.ttl
+++ b/shacl/projects/C02-project.ttl
@@ -1,10 +1,6 @@
 @prefix schema: <http://schema.org/> .
 @prefix sh: <http://www.w3.org/ns/shacl#> .
-@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix regen: <https://schema.regen.network#> .
-@prefix geojson: <https://purl.org/geojson/vocab#> .
-@prefix dash: <http://datashapes.org/dash#> .
-@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 
 regen:C02-Project rdfs:subClassOf regen:Project .
diff --git a/shacl/projects/C03-project.ttl b/shacl/projects/C03-project.ttl
index 3ee0ae8..0bc7cc8 100644
--- a/shacl/projects/C03-project.ttl
+++ b/shacl/projects/C03-project.ttl
@@ -1,7 +1,7 @@
 @prefix sh: <http://www.w3.org/ns/shacl#> .
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix regen: <https://schema.regen.network#> .
-@prefix schema: <http://schema.org/> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 
 regen:C03-Project rdfs:subClassOf regen:Project .