diff --git a/.github/workflows/golangci-lint.yaml b/.github/workflows/golangci-lint.yaml
index ce7054a..85af044 100644
--- a/.github/workflows/golangci-lint.yaml
+++ b/.github/workflows/golangci-lint.yaml
@@ -9,7 +9,7 @@ on:
 permissions:
   contents: read
   # Optional: allow read access to pull request. Use with `only-new-issues` option.
-  # pull-requests: read
+  pull-requests: read
 jobs:
   golangci:
     name: lint
@@ -32,7 +32,7 @@ jobs:
           # args: --issues-exit-code=0
 
           # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true
+          only-new-issues: true
 
           # Optional: if set to true then the all caching functionality will be complete disabled,
           #           takes precedence over all other caching options.
diff --git a/pkg/service/eth/block_id.go b/pkg/service/eth/block_id.go
index 70e9a62..addd4bc 100644
--- a/pkg/service/eth/block_id.go
+++ b/pkg/service/eth/block_id.go
@@ -68,7 +68,7 @@ func NewBlockIdentifier(id string) (BlockIdentifier, error) {
 		return newBlockIdentifier(BlockIDRoot, id), nil
 	}
 
-	if _, err := strconv.ParseInt(id, 10, 64); err == nil {
+	if _, err := strconv.ParseUint(id, 10, 64); err == nil {
 		return newBlockIdentifier(BlockIDSlot, id), nil
 	}
 
@@ -83,12 +83,12 @@ func newBlockIdentifier(id BlockIDType, value string) BlockIdentifier {
 }
 
 func NewSlotFromString(id string) (phase0.Slot, error) {
-	slot, err := strconv.ParseInt(id, 10, 64)
+	slot, err := strconv.ParseUint(id, 10, 64)
 	if err != nil {
 		return 0, err
 	}
 
-	return phase0.Slot(uint64(slot)), nil //nolint:gosec // slot parsed from string is validated
+	return phase0.Slot(slot), nil
 }
 
 func NewRootFromString(id string) (phase0.Root, error) {
diff --git a/pkg/service/eth/block_id_test.go b/pkg/service/eth/block_id_test.go
index 986d767..4f7f993 100644
--- a/pkg/service/eth/block_id_test.go
+++ b/pkg/service/eth/block_id_test.go
@@ -30,3 +30,30 @@ func TestBlockIDMapping(t *testing.T) {
 		})
 	}
 }
+
+func TestBlockIDRejectsNegativeSlot(t *testing.T) {
+	t.Parallel()
+
+	for _, id := range []string{"-1", "-100"} {
+		t.Run(id, func(t *testing.T) {
+			t.Parallel()
+
+			parsed, err := NewBlockIdentifier(id)
+			if err == nil {
+				t.Errorf("Expected error for %q, got type %d", id, parsed.Type())
+			}
+
+			if parsed.Type() != BlockIDInvalid {
+				t.Errorf("Expected BlockIDInvalid for %q, got %d", id, parsed.Type())
+			}
+		})
+	}
+}
+
+func TestNewSlotFromStringRejectsNegative(t *testing.T) {
+	t.Parallel()
+
+	if _, err := NewSlotFromString("-1"); err == nil {
+		t.Error("Expected error for negative slot, got nil")
+	}
+}
diff --git a/pkg/service/eth/state_id.go b/pkg/service/eth/state_id.go
index fc4e9e1..b72dc0a 100644
--- a/pkg/service/eth/state_id.go
+++ b/pkg/service/eth/state_id.go
@@ -66,7 +66,7 @@ func NewStateIdentifier(id string) (StateIdentifier, error) {
 		return newStateIdentifier(StateIDRoot, id), nil
 	}
 
-	if _, err := strconv.ParseInt(id, 10, 64); err == nil {
+	if _, err := strconv.ParseUint(id, 10, 64); err == nil {
 		return newStateIdentifier(StateIDSlot, id), nil
 	}