diff --git a/Dockerfile b/Dockerfile
index 39aca93..943e397 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,7 @@ RUN apt-get update \
  && apt-get install openssh-client python3-pip --no-install-recommends -y \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/* \
- && pip3 install rdiff-backup=2.0.5
+ && pip3 install rdiff-backup==2.0.5
 
 COPY *.sh /