diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index ba88e7a125..ad3a438c18 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 repository = "https://github.com/hacspec/hacspec"
 
 [dependencies]
-num = "0.2"
+num = "0.4"
 secret_integers = { path = "../utils/secret-integers", version = "0.1.7" } #FIXME: publish new version
 abstract_integers = { path = "../utils/abstract-integers", version = "0.1.5" } #FIXME: publish new version
 hacspec-attributes = { path = "../utils/attributes",  optional = true, version = "0.1.0-beta.1" }
diff --git a/utils/abstract-integers/Cargo.toml b/utils/abstract-integers/Cargo.toml
index 9d2b47aa27..f065a22458 100644
--- a/utils/abstract-integers/Cargo.toml
+++ b/utils/abstract-integers/Cargo.toml
@@ -10,4 +10,4 @@ license = "Apache-2.0"
 readme = "README.md"
 
 [dependencies]
-num = "0.2"
+num = "0.4"
diff --git a/utils/dev/Cargo.toml b/utils/dev/Cargo.toml
index b02565f796..b7d0de37ff 100644
--- a/utils/dev/Cargo.toml
+++ b/utils/dev/Cargo.toml
@@ -10,6 +10,6 @@ repository = "https://github.com/hacspec/hacspec"
 hacspec-lib = { path = "../../lib", version = "0.1.0-beta.1" }
 
 rand = "0.7"
-num = "0.2"
+num = "0.4"
 serde_json = "1.0"
 serde = {version = "1.0", features = ["derive"]}