diff --git a/Cargo.toml b/Cargo.toml
index 7dcacda..830feda 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,20 +35,15 @@ trace = []
 log = []
 
 [dependencies]
-proc-macro2 = {version = "1.0", default-features = false}
+proc-macro2 = {version = "1.0.32", default-features = false}
 quote = {version = "1.0", default-features = false}
-syn = {version = "1.0", default-features = false, features = ["full", "parsing", "printing", "proc-macro"]}
+syn = {version = "1.0.91", default-features = false, features = ["full", "parsing", "printing", "proc-macro"]}
 
 [dev-dependencies]
 env_logger = {version = "0.9", default-features = false}
-logging = {version = "0.4", package = "log"}
+logging = {version = "0.4.8", package = "log"}
 test-case = {version = "3.1"}
 tokio = {version = "1.0", default-features = false, features = ["rt-multi-thread", "macros"]}
-tracing = {version = "0.1"}
+tracing = {version = "0.1.20"}
 tracing-futures = {version = "0.2", default-features = false, features = ["std-future"]}
 tracing-subscriber = {version = "0.3", default-features = false, features = ["env-filter", "fmt"]}
-
-# A set of unused dependencies that we require to force correct minimum
-# versions of transitive dependencies, for cases where our dependencies
-# have incorrect dependency specifications themselves.
-_lazy_static_unused = { package = "lazy_static", version = "1.0.2" }