diff --git a/12.0.Dockerfile b/12.0.Dockerfile
index ab44cfda66fdf13181619ee9d022e0fe7ed8ef7a..906b25bb879d359fe39d957a0cdf5e409a8add5e 100644
--- a/12.0.Dockerfile
+++ b/12.0.Dockerfile
@@ -13,6 +13,7 @@ RUN set -x; \
             curl \
             fontconfig \
             git \
+            gnupg \
             libssl1.0-dev \
             libx11-6 \
             libxcb1 \