diff --git a/src/consensus/helpers/balance.zig b/src/consensus/helpers/balance.zig
index acdb5ff..8c9fd0b 100644
--- a/src/consensus/helpers/balance.zig
+++ b/src/consensus/helpers/balance.zig
@@ -25,8 +25,8 @@ pub fn getTotalBalance(state: *const consensus.BeaconState, indices: std.AutoHas
     var total: primitives.Gwei = 0;
     var iterator = indices.keyIterator();
     while (iterator.next()) |index| {
-        std.debug.print("index: {}\n", .{index});
-        std.debug.print("state.validators()[index.*].effective_balance: {}\n", .{state.validators()[index.*].effective_balance});
+        std.log.debug("index: {}\n", .{index});
+        std.log.debug("state.validators()[index.*].effective_balance: {}\n", .{state.validators()[index.*].effective_balance});
         total += state.validators()[index.*].effective_balance;
     }
     return @max(preset.ActivePreset.get().EFFECTIVE_BALANCE_INCREMENT, total);
diff --git a/src/consensus/helpers/committee.zig b/src/consensus/helpers/committee.zig
index 495247a..65e20e7 100644
--- a/src/consensus/helpers/committee.zig
+++ b/src/consensus/helpers/committee.zig
@@ -28,7 +28,7 @@ pub fn getCommitteeCountPerSlot(state: *const consensus.BeaconState, epoch: prim
     defer allocator.free(active_validator_indices);
 
     const active_validator_count = active_validator_indices.len;
-    std.debug.print("active_validator_count: {}\n", .{active_validator_count});
+    std.log.debug("active_validator_count: {}\n", .{active_validator_count});
     const slots_per_epoch = preset.ActivePreset.get().SLOTS_PER_EPOCH;
     const target_committee_size = preset.ActivePreset.get().TARGET_COMMITTEE_SIZE;
 
@@ -119,7 +119,7 @@ pub fn getBeaconCommittee(state: *const consensus.BeaconState, slot: primitives.
 pub fn getBeaconProposerIndex(state: *const consensus.BeaconState, allocator: std.mem.Allocator) !primitives.ValidatorIndex {
     const epoch = epoch_helper.getCurrentEpoch(state);
     const seed_origin = seed_helper.getSeed(state, epoch, constants.DOMAIN_BEACON_PROPOSER) ++ std.mem.asBytes(&state.slot());
-    std.debug.print("seed_origin: {any}\n", .{seed_origin});
+    std.log.debug("seed_origin: {any}\n", .{seed_origin});
     var seed: primitives.Bytes32 = undefined;
     sha256.hash(seed_origin, &seed, .{});
     const indices = try validator_helper.getActiveValidatorIndices(state, epoch, allocator);
diff --git a/src/consensus/helpers/domain.zig b/src/consensus/helpers/domain.zig
index b1ec2ec..9bfda97 100644
--- a/src/consensus/helpers/domain.zig
+++ b/src/consensus/helpers/domain.zig
@@ -21,7 +21,7 @@ pub fn computeForkDataRoot(current_version: primitives.Version, genesis_validato
         .genesis_validators_root = genesis_validators_root,
     };
 
-    std.debug.print("ForkData: {}\n", .{fork_data});
+    std.log.debug("ForkData: {}\n", .{fork_data});
     // todo: implement hash_tree_root
     return @as(primitives.Root, .{0} ** 32);
 }
diff --git a/src/consensus/helpers/signing_root.zig b/src/consensus/helpers/signing_root.zig
index 327707d..fd14856 100644
--- a/src/consensus/helpers/signing_root.zig
+++ b/src/consensus/helpers/signing_root.zig
@@ -15,14 +15,14 @@ const configs = @import("../../configs/config.zig");
 ///   ))
 pub fn computeSigningRoot(comptime sszObject: type, domain: primitives.Domain) primitives.Root {
     // const objectRoot = hashTreeRoot(sszObject);
-    std.debug.print("sszObject: {}\n", .{sszObject});
+    std.log.debug("sszObject: {}\n", .{sszObject});
     const objectRoot = @as(primitives.Root, .{0} ** 32);
     const signingData = consensus.SigningData{
         .object_root = objectRoot,
         .domain = domain,
     };
 
-    std.debug.print("signingData: {}\n", .{signingData});
+    std.log.debug("signingData: {}\n", .{signingData});
     // return hashTreeRoot(signingData);
     return @as(primitives.Root, .{0} ** 32);
 }
diff --git a/src/consensus/helpers/validator.zig b/src/consensus/helpers/validator.zig
index 8d99899..73630c8 100644
--- a/src/consensus/helpers/validator.zig
+++ b/src/consensus/helpers/validator.zig
@@ -158,7 +158,7 @@ pub fn computeProposerIndex(state: *const consensus.BeaconState, indices: []cons
         var seed_plus: [40]u8 = undefined;
         @memcpy(seed_plus[0..32], &seed);
         std.mem.writeInt(u64, seed_plus[32..40], @divFloor(i, 32), .little);
-        std.debug.print("seed_plus: {any}, i: {}\n", .{ seed_plus, i });
+        std.log.debug("seed_plus: {any}, i: {}\n", .{ seed_plus, i });
         std.crypto.hash.sha2.Sha256.hash(&seed_plus, &hash_result, .{});
         const randomByte = hash_result[@mod(i, 32)];
         const effectiveBalance = state.validators()[candidate_index].effective_balance;
diff --git a/src/root.zig b/src/root.zig
index 7b29ef7..f8f396d 100644
--- a/src/root.zig
+++ b/src/root.zig
@@ -25,4 +25,5 @@ pub const ssz = @import("./ssz/ssz.zig");
 
 test {
     @import("std").testing.refAllDeclsRecursive(@This());
+    _ = @import("./spec_tests/root.zig");
 }
diff --git a/src/spec_tests/root.zig b/src/spec_tests/root.zig
new file mode 100644
index 0000000..a6adb30
--- /dev/null
+++ b/src/spec_tests/root.zig
@@ -0,0 +1,3 @@
+test {
+    _ = @import("./ssz_static/root.zig");
+}
diff --git a/src/spec_tests/ssz_static/root.zig b/src/spec_tests/ssz_static/root.zig
new file mode 100644
index 0000000..a993895
--- /dev/null
+++ b/src/spec_tests/ssz_static/root.zig
@@ -0,0 +1,16 @@
+const std = @import("std");
+const testing = std.testing;
+const ssz = @import("../../ssz/ssz.zig");
+const types = @import("../../consensus/types.zig");
+
+test "hash tree root" {
+    const fork = types.Fork{
+        .previous_version = [4]u8{ 0x75, 0xeb, 0x7f, 0x25 },
+        .current_version = [4]u8{ 0x10, 0xd4, 0xe2, 0x7f },
+        .epoch = 8876772290899440384,
+    };
+    var out: [32]u8 = [_]u8{0} ** 32;
+    try ssz.hashTreeRoot(fork, &out, testing.allocator);
+    const expect: [32]u8 = [_]u8{ 0x98, 0x2a, 0x69, 0x96, 0xc9, 0x2f, 0x86, 0xf6, 0x37, 0x68, 0x3c, 0x72, 0xd9, 0x09, 0xc7, 0xa8, 0x68, 0x11, 0x0e, 0x3b, 0x05, 0xf7, 0xb4, 0x48, 0x44, 0xbc, 0x53, 0x96, 0x0d, 0x89, 0x56, 0xf5 };
+    try std.testing.expect(std.mem.eql(u8, out[0..], expect[0..]));
+}
diff --git a/src/ssz/ssz.zig b/src/ssz/ssz.zig
index 282e4a2..315ec33 100644
--- a/src/ssz/ssz.zig
+++ b/src/ssz/ssz.zig
@@ -1001,7 +1001,7 @@ pub fn hashTreeRoot(value: anytype, out: *[32]u8, allocator: Allocator) !void {
             var chunks = ArrayList(chunk).init(allocator);
             defer chunks.deinit();
             var tmp: chunk = undefined;
-            inline for (type_info.Struct.fields) |f| {
+            inline for (type_info.@"struct".fields) |f| {
                 try hashTreeRoot(@field(value, f.name), &tmp, allocator);
                 try chunks.append(tmp);
             }