diff --git a/.circleci/config.yml b/.circleci/config.yml
index c83a999..2e44b34 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,9 +1,9 @@
-version: 2
+version: 2.1
 
 jobs:
   build:
     docker:
-      - image: rust:latest
+      - image: circleci/rust:latest
     environment:
       TZ: "/usr/share/zoneinfo/your/location"
     steps:
diff --git a/Cargo.toml b/Cargo.toml
index 1c2e0a9..c060a51 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,12 +6,12 @@ edition = "2018"
 
 [dependencies]
 ndarray = "0.13"
-nalgebra = "0.20.0"
+nalgebra = "0.21.0"
 num-traits = "0.2.11"
 num = "0.2.1"
 rand = "0.7.3"
-serde = { version = "1.0.105", features = ["derive"] }
-serde_derive = "1.0.105"
+serde = { version = "1.0.111", features = ["derive"] }
+serde_derive = "1.0.111"
 
 [dev-dependencies]
 criterion = "0.3"