diff --git a/DEPENDENCIES b/DEPENDENCIES
index 20342efaf..e2b28f5c4 100644
--- a/DEPENDENCIES
+++ b/DEPENDENCIES
@@ -1,7 +1,7 @@
 vendorpull https://github.com/sourcemeta/vendorpull 1dcbac42809cf87cb5b045106b863e17ad84ba02
 uwebsockets https://github.com/uNetworking/uWebSockets v20.78.0
 core https://github.com/sourcemeta/core 5d187a796444fef1b5e044c659800085a4be7ef4
-blaze https://github.com/sourcemeta/blaze 9ca83f191a263eef070fdfc0ecb3e6ab974a4747
+blaze https://github.com/sourcemeta/blaze 3c2ddb90f26eb50821442f54c5db88276ab9a558
 bootstrap https://github.com/twbs/bootstrap v5.3.3
 bootstrap-icons https://github.com/twbs/icons v1.11.3
 collections/sourcemeta/std/v0 https://github.com/sourcemeta/std v0.4.0
diff --git a/test/cli/index/common/fail-vocabulary-not-object.sh b/test/cli/index/common/fail-vocabulary-not-object.sh
index bd7e69d4a..8b6431df5 100755
--- a/test/cli/index/common/fail-vocabulary-not-object.sh
+++ b/test/cli/index/common/fail-vocabulary-not-object.sh
@@ -42,7 +42,7 @@ cat << 'EOF' > "$TMP/schemas/test.json"
 EOF
 
 
-"$1" --skip-banner --deterministic "$TMP/one.json" "$TMP/output" --concurrency 1 > "$TMP/output.txt" && CODE="$?" || CODE="$?"
+"$1" --skip-banner "$TMP/one.json" "$TMP/output" > "$TMP/output.txt" && CODE="$?" || CODE="$?"
 test "$CODE" = "1" || exit 1
 
 cat << EOF > "$TMP/expected.txt"
diff --git a/vendor/blaze/src/foundation/foundation.cc b/vendor/blaze/src/foundation/foundation.cc
index e93b713e6..438ffba3c 100644
--- a/vendor/blaze/src/foundation/foundation.cc
+++ b/vendor/blaze/src/foundation/foundation.cc
@@ -512,10 +512,16 @@ auto sourcemeta::blaze::parse_vocabularies(
     return std::nullopt;
   }
 
-  assert(vocabulary_entry->is_object());
+  if (!vocabulary_entry->is_object()) {
+    return std::nullopt;
+  }
+
   sourcemeta::blaze::Vocabularies result;
   for (const auto &entry : vocabulary_entry->as_object()) {
-    assert(entry.second.is_boolean());
+    if (!entry.second.is_boolean()) {
+      return std::nullopt;
+    }
+
     result.insert(entry.first, entry.second.to_boolean());
   }