diff --git a/ci/install-private-maven.sh b/ci/install-private-maven.sh
index fb68007..52354dd 100755
--- a/ci/install-private-maven.sh
+++ b/ci/install-private-maven.sh
@@ -4,12 +4,33 @@ set -euo pipefail
 ROOT_DIR="$(CDPATH= cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
 MAVEN_REPO_LOCAL="${MAVEN_REPO_LOCAL:-${HOME}/.m2/repository}"
 PRIVATE_ROOT="${ROOT_DIR}/maven_private"
+TMP_DIR="$(mktemp -d)"
+INSTALL_POM="${TMP_DIR}/pom.xml"
+
+trap 'rm -rf "${TMP_DIR}"' EXIT
 
 if [ ! -d "${PRIVATE_ROOT}" ]; then
   echo "missing private maven directory: ${PRIVATE_ROOT}" >&2
   exit 1
 fi
 
+mkdir -p "${MAVEN_REPO_LOCAL}"
+
+cat > "${INSTALL_POM}" <<'EOF'
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>local.private</groupId>
+  <artifactId>install-private-maven</artifactId>
+  <version>1.0.0</version>
+  <packaging>pom</packaging>
+</project>
+EOF
+
+# Remove cached negative lookups so Maven retries once the private artifacts are installed.
+find "${MAVEN_REPO_LOCAL}/com/red/circle" -type f -name '*.lastUpdated' -delete 2>/dev/null || true
+
 find "${PRIVATE_ROOT}" -mindepth 2 -maxdepth 2 -type d | sort | while read -r version_dir; do
   pom_file="$(find "${version_dir}" -maxdepth 1 -type f -name '*.pom' | sort | head -1)"
   if [ -z "${pom_file}" ]; then
@@ -18,13 +39,13 @@ find "${PRIVATE_ROOT}" -mindepth 2 -maxdepth 2 -type d | sort | while read -r ve
 
   jar_file="$(find "${version_dir}" -maxdepth 1 -type f -name '*.jar' ! -name 'original-*' | sort | head -1 || true)"
   if [ -n "${jar_file}" ]; then
-    mvn -Dmaven.repo.local="${MAVEN_REPO_LOCAL}" \
+    mvn -B -f "${INSTALL_POM}" -Dmaven.repo.local="${MAVEN_REPO_LOCAL}" \
       install:install-file \
       -DpomFile="${pom_file}" \
       -Dfile="${jar_file}" \
       -DgeneratePom=false
   else
-    mvn -Dmaven.repo.local="${MAVEN_REPO_LOCAL}" \
+    mvn -B -f "${INSTALL_POM}" -Dmaven.repo.local="${MAVEN_REPO_LOCAL}" \
       install:install-file \
       -DpomFile="${pom_file}" \
       -Dfile="${pom_file}" \