diff --git a/docs/.docker/Dockerfile b/docs/.docker/Dockerfile
index 0858cdb8..6e32e5cd 100644
--- a/docs/.docker/Dockerfile
+++ b/docs/.docker/Dockerfile
@@ -53,13 +53,17 @@ ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium-browser \
 # asciidoctor-kroki: d02fbf06cdb837524f5e4e12537c05e0bb83c715 -> v0.18
 WORKDIR /opt/antora
 RUN npm init -y && npm i --save-exact \
-      https://gitlab.com/antora/antora/-/tree/aa33c8283f9cbc76df93201bec5f8421e8f59a43/packages/cli \
-      https://gitlab.com/antora/antora/-/tree/aa33c8283f9cbc76df93201bec5f8421e8f59a43/packages/site-generator \
-      https://gitlab.com/antora/antora-lunr-extension/-/commit/41975fc8f62cb2219a2de2f618de1ae1482bd0ce \
-      https://github.com/mermaid-js/mermaid-cli/tree/a85b11df7064498d5b6b97ee9b2d4a7c10cb42ae \
+      https://gitlab.com/antora/antora-lunr-extension.git#41975fc8f62cb2219a2de2f618de1ae1482bd0ce \
+      https://github.com/mermaid-js/mermaid-cli.git#a85b11df7064498d5b6b97ee9b2d4a7c10cb42ae \
       https://github.com/asciidoctor/asciidoctor-kroki.git#d02fbf06cdb837524f5e4e12537c05e0bb83c715 \
     && npm cache clean --force
 
+RUN git clone https://gitlab.com/antora/antora.git \
+    && cd antora \
+    && git checkout aa33c8283f9cbc76df93201bec5f8421e8f59a43 \
+    && npm install --save-exact packages/cli \
+    && npm install --save-exact packages/site-generator
+
 # Make installed modules resolvable even when the workdir is the mounted
 # project (which has no node_modules of its own).
 ENV NODE_PATH=/opt/antora/node_modules