diff --git a/.clusterfuzzlite/build.sh b/.clusterfuzzlite/build.sh
index 901311ac..87af18df 100644
--- a/.clusterfuzzlite/build.sh
+++ b/.clusterfuzzlite/build.sh
@@ -15,9 +15,9 @@ function build_seed_corpus() {
 
 cd "$SRC"/oxigraph
 cargo fuzz build -O --debug-assertions
-for TARGET in sparql_eval sparql_results_json sparql_results_tsv
+for TARGET in sparql_eval # sparql_results_json sparql_results_tsv
 do
   cp fuzz/target/x86_64-unknown-linux-gnu/release/$TARGET "$OUT"/
 done
-build_seed_corpus sparql_results_json json
-build_seed_corpus sparql_results_tsv tsv
+# build_seed_corpus sparql_results_json json
+# build_seed_corpus sparql_results_tsv tsv
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c62c9314..a61f3439 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -298,8 +298,10 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           fuzz-seconds: 600
-          mode: 'code-change'
+          mode: code-change
           sanitizer: address
+          minimize-crashes: true
+          parallel-fuzzing: true
           storage-repo: https://${{ secrets.FULL_ACCESS_TOKEN }}@github.com/oxigraph/clusterfuzzlite-oxigraph.git
 
   fuzz_repo:
@@ -318,8 +320,10 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           fuzz-seconds: 3600
-          mode: 'batch'
+          mode: batch
           sanitizer: address
+          minimize-crashes: true
+          parallel-fuzzing: true
           storage-repo: https://${{ secrets.FULL_ACCESS_TOKEN }}@github.com/oxigraph/clusterfuzzlite-oxigraph.git
 
   fuzz_prune:
@@ -338,7 +342,7 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           fuzz-seconds: 14400
-          mode: 'prune'
+          mode: prune
           storage-repo: https://${{ secrets.FULL_ACCESS_TOKEN }}@github.com/oxigraph/clusterfuzzlite-oxigraph.git
 
   fuzz_coverage:
@@ -354,6 +358,6 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           fuzz-seconds: 600
-          mode: 'coverage'
-          sanitizer: 'coverage'
+          mode: coverage
+          sanitizer: coverage
           storage-repo: https://${{ secrets.FULL_ACCESS_TOKEN }}@github.com/oxigraph/clusterfuzzlite-oxigraph.git