diff --git a/README.md b/README.md
index 7d227b2..b47384f 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ As a crates.io dependency:
 
 ```toml
 [dependencies]
-stark-felt = "0.0.3"
+stark-felt = "0.0.1"
 ```
 
 As a git dependency:
@@ -38,6 +38,7 @@ As a git dependency:
 ```toml
 [dependencies]
 stark-felt = { git = "https://github.com/starknet-io/types-rs" }
+starknet-types-core = { git = "https://github.com/starknet-io/types-rs.git", version = "0.0.1", default-features = false, features = ["serde"] }
 ```
 
 ## Build from source
diff --git a/crates/starknet-types-core/Cargo.toml b/crates/starknet-types-core/Cargo.toml
index e6b9d39..a280e72 100644
--- a/crates/starknet-types-core/Cargo.toml
+++ b/crates/starknet-types-core/Cargo.toml
@@ -21,7 +21,9 @@ arbitrary = { version = "1.3.0", optional = true, default-features = false }
 num-traits = { version = "0.2.16", default-features = false }
 num-bigint = {version = "0.4.4",  default-features = false}
 num-integer = {version = "0.1.45",  default-features = false}
-lazy_static = { version = "1.4.0", default-features = false }
+lazy_static = { version = "1.4.0", default-features = false, features = [
+    "spin_no_std",
+] }
 
 [features]
 default = ["std", "serde", "curve"]