diff --git a/contrib/sync_db_pools/lib/Cargo.toml b/contrib/sync_db_pools/lib/Cargo.toml
index e6cff0cf..24b3d5d1 100644
--- a/contrib/sync_db_pools/lib/Cargo.toml
+++ b/contrib/sync_db_pools/lib/Cargo.toml
@@ -19,7 +19,7 @@ memcache_pool = ["memcache", "r2d2-memcache"]
 
 [dependencies]
 r2d2 = "0.8"
-tokio = { version = "1.4", features = ["rt", "rt-multi-thread"] }
+tokio = { version = ">=1.4,<1.6", features = ["rt", "rt-multi-thread"] }
 serde = { version = "1.0", features = ["derive"] }
 
 diesel = { version = "1.0", default-features = false, optional = true }
diff --git a/core/http/Cargo.toml b/core/http/Cargo.toml
index 7fa3c214..d5fde3b1 100644
--- a/core/http/Cargo.toml
+++ b/core/http/Cargo.toml
@@ -29,7 +29,7 @@ mime = "0.3.13"
 time = "0.2.11"
 indexmap = { version = "1.5.2", features = ["std"] }
 tokio-rustls = { version = "0.22.0", optional = true }
-tokio = { version = "1.0", features = ["net", "sync", "time"] }
+tokio = { version = ">=1.4,<1.6", features = ["net", "sync", "time"] }
 log = "0.4"
 ref-cast = "1.0"
 uncased = "0.9.6"
diff --git a/core/lib/Cargo.toml b/core/lib/Cargo.toml
index bc4ff321..90d54439 100644
--- a/core/lib/Cargo.toml
+++ b/core/lib/Cargo.toml
@@ -70,7 +70,7 @@ path = "../http"
 features = ["serde"]
 
 [dependencies.tokio]
-version = "1.0"
+version = ">=1.4,<1.6"
 features = ["fs", "io-std", "io-util", "rt-multi-thread", "sync", "signal", "macros"]
 
 [dependencies.tokio-util]