diff --git a/Cargo.toml b/Cargo.toml
index d658d77..e66d1f1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,15 +15,15 @@ rust-version = "1.56"
 proc-macro = true
 
 [dependencies]
-proc-macro2 = "1.0"
-quote = "1.0"
-syn = "2.0"
+proc-macro2 = "1.0.63"
+quote = "1.0.29"
+syn = "2.0.23"
 
 [dev-dependencies]
-rustversion = "1.0"
-serde = "1.0"
-serde_json = "1.0"
-trybuild = { version = "1.0.49", features = ["diff"] }
+rustversion = "1.0.13"
+serde = "1.0.166"
+serde_json = "1.0.100"
+trybuild = { version = "1.0.81", features = ["diff"] }
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]