diff --git a/.travis.yml b/.travis.yml
index 050d3dd..30838c4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,13 +9,13 @@ os:
 
 rust:
     - stable
-    - beta 
+    - beta
     - nightly
 
 before_script:
     - rustup component add rustfmt
 
 script:
-    - cargo build --verbose
-    - cargo test --verbose
+    - cargo build --locked --verbose
+    - cargo test --locked --verbose
     - cargo fmt --all -- --check
diff --git a/Makefile b/Makefile
index 64aa130..5964e1a 100644
--- a/Makefile
+++ b/Makefile
@@ -3,13 +3,13 @@
 all: test build
 
 build:
-	@cargo build
+	@cargo build --locked
 
 install:
-	@cargo install --force --path .
+	@cargo install --force --locked --path .
 
 test:
-	@cargo test
+	@cargo test --locked
 	@cargo fmt --all -- --check
 
 lint: