diff --git a/.github/workflows/server-web-api-test.yml b/.github/workflows/server-web-api-test.yml
index 428266623..2443f0dc4 100644
--- a/.github/workflows/server-web-api-test.yml
+++ b/.github/workflows/server-web-api-test.yml
@@ -25,6 +25,24 @@ jobs:
         java-version: 1.8
     - name: Build DIEF with Maven
       run: mvn clean install -Dskip=true -DskipTests -Dmaven.source.skip=true -Dhttp.keepAlive=false -Dmaven.wagon.http.pool=false -Dmaven.wagon.http.retryHandler.count=3
+
+    - name: Debug List Maven repo and parent POM
+      run: |
+        sed -n '1,120p' ~/.m2/repository/org/dbpedia/extraction/core/4.2-SNAPSHOT/core-4.2-SNAPSHOT.pom | grep -n '<parent>\|<version>'
+        echo "=== Check installed POMs for unresolved \${revision} in <parent><version> ==="
+        grep -n "<parent>" ~/.m2/repository/org/dbpedia/extraction/*/4.2-SNAPSHOT/*.pom || true
+        grep -n "<version>\${revision}</version>" ~/.m2/repository/org/dbpedia/extraction/*/4.2-SNAPSHOT/*.pom || true
+
+        echo "Listing parent POM and Maven repo contents:"
+        ls -l ../pom.xml || ls -l ../../pom.xml || true
+        ls -lR ~/.m2/repository/org/dbpedia/extraction || true
+
+    - name: Debug Print effective POM for server module
+      run: |
+        cd server
+        mvn help:effective-pom -Doutput=effective-pom.xml
+        cat effective-pom.xml
+        cd ..
     - name: Start DBpedia Server
       run: |
         cd server
diff --git a/.github/workflows/snapshot_deploy.yml b/.github/workflows/snapshot_deploy.yml
index 9615575c6..827b09218 100644
--- a/.github/workflows/snapshot_deploy.yml
+++ b/.github/workflows/snapshot_deploy.yml
@@ -39,19 +39,40 @@ jobs:
           </settings>
           EOF
 
+      - name: Compute Maven-safe REVISION
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          sanitize() {
+            # lowercase; allow only [a-z0-9.-]; collapse dashes; trim edges
+            echo "$1" \
+              | tr '[:upper:]' '[:lower:]' \
+              | sed -E 's/[^a-z0-9.-]+/-/g; s/-+/-/g; s/^-+//; s/-+$//'
+          }
+
+          if [[ "${GITHUB_REF}" == refs/pull/* ]]; then
+            # e.g. refs/pull/42/merge -> pr-42-SNAPSHOT
+            pr_num="$(echo "${GITHUB_REF}" | sed -E 's#refs/pull/([0-9]+).*#\1#')"
+            base="pr-${pr_num}"
+          else
+            # e.g. refs/heads/feature/foo -> feature-foo-SNAPSHOT
+            base="${GITHUB_REF##*/}"
+          fi
+
+          safe_base="$(sanitize "${base}")"
+          [[ -z "${safe_base}" ]] && safe_base="build"
+
+          REVISION="${safe_base}-SNAPSHOT"
+          echo "Using Maven revision: ${REVISION}"
+          echo "REVISION=${REVISION}" >> "$GITHUB_ENV"
+
       - name: Deploy Snapshot
         env:
             GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-            REPO: ${{ github.repository }}    # expands to "owner/repo"
+            REPO: ${{ github.repository }}
         run: |
-           # Example version names:
-           # For branch 'master': master-SNAPSHOT
-           # For branch 'feature/foo': feature/foo-SNAPSHOT
-           # For PR #42: pr-42-SNAPSHOT
-           if [[ "${GITHUB_REF}" == refs/pull/* ]]; then
-             REVISION="pr-${GITHUB_REF#refs/pull/}-SNAPSHOT"
-           else
-             REVISION="${GITHUB_REF##*/}-SNAPSHOT"
-           fi
-           echo "Deploying to: https://maven.pkg.github.com/${REPO} with revision: $REVISION"
-           mvn deploy -DskipTests -Dgithub.repo.url="https://maven.pkg.github.com/${REPO}" -Drevision="$REVISION"
+          echo "Deploying to https://maven.pkg.github.com/${REPO} with revision ${REVISION}"
+          mvn deploy -DskipTests \
+            -Dgithub.repo.url="https://maven.pkg.github.com/${REPO}" \
+            -Drevision="${REVISION}"
diff --git a/.mvn/maven.config b/.mvn/maven.config
new file mode 100644
index 000000000..f84060456
--- /dev/null
+++ b/.mvn/maven.config
@@ -0,0 +1 @@
+-Drevision=4.2-SNAPSHOT
diff --git a/core/pom.xml b/core/pom.xml
index 8e7461bfa..694b6d423 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -8,6 +8,7 @@
         <groupId>org.dbpedia</groupId>
         <artifactId>extraction</artifactId>
         <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>org.dbpedia.extraction</groupId>
diff --git a/dump/pom.xml b/dump/pom.xml
index 459b7488b..509058e87 100644
--- a/dump/pom.xml
+++ b/dump/pom.xml
@@ -8,6 +8,7 @@
         <groupId>org.dbpedia</groupId>
         <artifactId>extraction</artifactId>
         <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>org.dbpedia.extraction</groupId>
diff --git a/scripts/pom.xml b/scripts/pom.xml
index e6a28d407..e5addcb88 100644
--- a/scripts/pom.xml
+++ b/scripts/pom.xml
@@ -7,6 +7,7 @@
         <groupId>org.dbpedia</groupId>
         <artifactId>extraction</artifactId>
         <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>org.dbpedia.extraction</groupId>
diff --git a/server/pom.xml b/server/pom.xml
index 9f9b5a805..c819ea558 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -8,6 +8,7 @@
 		<groupId>org.dbpedia</groupId>
 		<artifactId>extraction</artifactId>
 		<version>${revision}</version>
+		<relativePath>../pom.xml</relativePath>
 	</parent>
 
 	<groupId>org.dbpedia.extraction</groupId>