diff --git a/.github/workflows/s390x.yml b/.github/workflows/s390x.yml
index ecd5e7641..938a3ce2d 100644
--- a/.github/workflows/s390x.yml
+++ b/.github/workflows/s390x.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - uses: uraimo/run-on-arch-action@b0ffb25eb00af00468375982384441f063da1741 # v2.7.2
+      - uses: uraimo/run-on-arch-action@5397f9e30a9b62422f302092631c99ae1effcd9e # v2.8.1
         name: Test
         id: runcmd
         with:
diff --git a/src/art/art.c b/src/art/art.c
index dc2f17a5d..7bca7eb2c 100644
--- a/src/art/art.c
+++ b/src/art/art.c
@@ -1318,7 +1318,7 @@ static art_val_t *art_find_at(const art_node_t *node,
 }
 
 // Returns the size in bytes of the subtrie.
-size_t art_size_in_bytes_at(const art_node_t *node) {
+static size_t art_size_in_bytes_at(const art_node_t *node) {
     if (art_is_leaf(node)) {
         return 0;
     }
@@ -1372,7 +1372,7 @@ static void art_node_print_type(const art_node_t *node) {
     }
 }
 
-void art_node_printf(const art_node_t *node, uint8_t depth) {
+static void art_node_printf(const art_node_t *node, uint8_t depth) {
     if (art_is_leaf(node)) {
         printf("{ type: Leaf, key: ");
         art_leaf_t *leaf = CROARING_CAST_LEAF(node);
diff --git a/src/roaring64.c b/src/roaring64.c
index 914faefe0..208c198de 100644
--- a/src/roaring64.c
+++ b/src/roaring64.c
@@ -262,19 +262,6 @@ roaring64_bitmap_t *roaring64_bitmap_of_ptr(size_t n_args,
     return r;
 }
 
-roaring64_bitmap_t *roaring64_bitmap_of(size_t n_args, ...) {
-    roaring64_bitmap_t *r = roaring64_bitmap_create();
-    roaring64_bulk_context_t context = CROARING_ZERO_INITIALIZER;
-    va_list ap;
-    va_start(ap, n_args);
-    for (size_t i = 0; i < n_args; i++) {
-        uint64_t val = va_arg(ap, uint64_t);
-        roaring64_bitmap_add_bulk(r, &context, val);
-    }
-    va_end(ap);
-    return r;
-}
-
 static inline leaf_t *containerptr_roaring64_bitmap_add(roaring64_bitmap_t *r,
                                                         uint8_t *high48,
                                                         uint16_t low16,