diff --git a/.drone.yml b/.drone.yml
index 91461e4..41ecf2c 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -3,10 +3,8 @@ name: build-and-test
 
 steps:
 - name: test
-  image: rust:1.76-slim
+  image: git.agnos.is/projectmoon/gemfreely-build
   commands:
-  - rustup component add rustfmt
-  - cargo install --locked cargo-deny
   - cargo build
   - cargo test --verbose
   - cargo deny check licenses
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..b2f3e7b
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,5 @@
+# This dockerfile is used for the CI pipeline, pre-installed build
+# deps, so we don't spend time compiling them during every CI run.
+FROM rust:1.76-slim
+RUN rustup component add rustfmt
+RUN cargo install --locked cargo-deny