diff --git a/spatialos-sdk/Cargo.toml b/spatialos-sdk/Cargo.toml
index 12b363a2..aba49946 100644
--- a/spatialos-sdk/Cargo.toml
+++ b/spatialos-sdk/Cargo.toml
@@ -14,7 +14,7 @@ bitflags = "1.2.1"
 spatialos-sdk-sys = { path = "../spatialos-sdk-sys"}
 
 [dev-dependencies]
-approx = "0.3"
+approx = "0.4"
 static_assertions = "1.1.0"
 structopt = "0.3"
 tap="0.4"
diff --git a/test-suite/Cargo.toml b/test-suite/Cargo.toml
index faee42e7..2e6fc245 100644
--- a/test-suite/Cargo.toml
+++ b/test-suite/Cargo.toml
@@ -6,4 +6,4 @@ edition = "2018"
 
 [dependencies]
 spatialos-sdk = { path = "../spatialos-sdk"}
-approx = "0.3"
+approx = "0.4"