diff --git a/Cargo.toml b/Cargo.toml
index ab37cd4..9909be0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,11 +13,11 @@ rust-version = "1.56"
 
 [dependencies]
 monostate-impl = { version = "=0.1.7", path = "impl" }
-serde = { version = "1.0", default-features = false }
+serde = { version = "1.0.166", default-features = false }
 
 [dev-dependencies]
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde = { version = "1.0.166", features = ["derive"] }
+serde_json = "1.0.99"
 
 [lib]
 doc-scrape-examples = false
diff --git a/impl/Cargo.toml b/impl/Cargo.toml
index fc66165..6285091 100644
--- a/impl/Cargo.toml
+++ b/impl/Cargo.toml
@@ -12,6 +12,6 @@ rust-version = "1.56"
 proc-macro = true
 
 [dependencies]
-syn = { version = "2.0", default-features = false, features = ["proc-macro", "parsing"] }
-quote = "1.0"
-proc-macro2 = "1.0"
+syn = { version = "2.0.23", default-features = false, features = ["proc-macro", "parsing"] }
+quote = "1.0.29"
+proc-macro2 = "1.0.63"