diff --git a/tests/Dockerfile b/tests/Dockerfile
index 7322459..338f1f5 100644
--- a/tests/Dockerfile
+++ b/tests/Dockerfile
@@ -36,7 +36,8 @@ COPY vendor/ vendor/
 RUN nimble setup -y
 
 # Build libplum static library
-RUN cmake -B vendor/libplum/build \
+RUN rm -rf vendor/libplum/build && \
+    cmake -B vendor/libplum/build \
     -DCMAKE_BUILD_TYPE=Release \
     -DBUILD_SHARED_LIBS=OFF \
     vendor/libplum && \