diff --git a/Cargo.toml b/Cargo.toml
index 0675acc3b..e16a8c755 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ paperclip-macros = { path = "macros", version = "0.5.1", optional = true }
 
 env_logger = { version = "0.8", optional = true }
 git2 = { version = "0.13", optional = true }
-heck = { version = "0.3", optional = true }
+heck = { version = "0.4", optional = true }
 http = { version = "0.2", optional = true }
 itertools = "0.10"
 log = { version = "0.4", optional = true }
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 434735702..b11310e75 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -18,7 +18,7 @@ actix-multipart = { version = "0", optional = true }
 actix-session = { version = "0", optional = true }
 actix-files = {version = "0", optional = true}
 chrono = { version = "0", optional = true }
-heck = { version = "0.3", optional = true }
+heck = { version = "0.4", optional = true }
 once_cell = "1.4"
 log = { version = "0.4", optional = true }
 mime = "0.3"
diff --git a/macros/Cargo.toml b/macros/Cargo.toml
index 61d3029e5..845ec2940 100644
--- a/macros/Cargo.toml
+++ b/macros/Cargo.toml
@@ -18,7 +18,7 @@ proc-macro2 = "1.0"
 proc-macro-error = "1.0"
 quote = "1.0"
 syn = { version = "1.0", features = ["full"] }
-heck = { version = "0.3", optional = true }
+heck = { version = "0.4", optional = true }
 http = { version = "0.2", optional = true }
 lazy_static = { version = "1.4", optional = true }
 strum = { version = "0.22", optional = true }