diff --git a/.drone.yml b/.drone.yml
index d34cce6..7bd45fe 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -6,7 +6,7 @@ platform:
 
 steps:
 - name: test
-  image: rust:1.66.1
+  image: ${RUST_IMAGE}
   commands:
   - rustc --version
   - cargo --version
@@ -21,7 +21,7 @@ platform:
 
 steps:
 - name: test
-  image: rust:1.66.1
+  image: ${RUST_IMAGE}
   commands:
   - rustc --version
   - cargo --version