diff --git a/Cargo.toml b/Cargo.toml
index c67f4a6..72377ba 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,10 +17,10 @@ complex = ["num-complex", "num-traits", "pyo3/num-complex"]
 extension-module = ["pyo3/extension-module"]
 
 [dependencies]
-num-complex = { version = "0.4.0", optional = true }
-num-traits = { version = "0.2.15", optional = true }
+num-complex = { version = "^0.4.0", optional = true }
+num-traits = { version = "^0.2.15", optional = true }
 paste = "1.0"
-pyo3 = { version = "0.17", default-features = false, features = ["macros", "multiple-pymethods"] }
+pyo3 = { version = "0.19", default-features = false, features = ["macros", "multiple-pymethods"] }
 time = { version = "0.3", optional = true }
 
 [dev-dependencies]