diff --git a/scrapyd/arm/Dockerfile b/scrapyd/arm/Dockerfile
index 1cd920c..68b9efc 100644
--- a/scrapyd/arm/Dockerfile
+++ b/scrapyd/arm/Dockerfile
@@ -7,7 +7,7 @@ MAINTAINER EasyPi Software Foundation
 
 ENV SCRAPY_VERSION=2.5.0
 ENV SCRAPYD_VERSION=1.2.1
-ENV SCRAPYRT_VERSION=0.12
+ENV SCRAPYRT_VERSION=v0.12
 ENV PILLOW_VERSION=8.2.0
 
 RUN set -xe \
diff --git a/scrapyd/py3/Dockerfile b/scrapyd/py3/Dockerfile
index 794b94b..4917976 100644
--- a/scrapyd/py3/Dockerfile
+++ b/scrapyd/py3/Dockerfile
@@ -7,7 +7,7 @@ MAINTAINER EasyPi Software Foundation
 
 ENV SCRAPY_VERSION=2.5.0
 ENV SCRAPYD_VERSION=1.2.1
-ENV SCRAPYRT_VERSION=0.12
+ENV SCRAPYRT_VERSION=v0.12
 ENV PILLOW_VERSION=8.2.0
 
 RUN set -xe \