diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 32668e3..4fc1b22 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -32,7 +32,7 @@ jobs:
       run: mvn -B verify -DgcRecordWrites=1000
 
     - name: Store built native libraries for later jobs
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: native-libraries
         path: |
@@ -64,7 +64,7 @@ jobs:
           cache: maven
 
       - name: Fetch built native libraries
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: native-libraries
           path: src/main/resources/org/lmdbjava
@@ -73,7 +73,7 @@ jobs:
         run: mvn -B test -Dtest=VerifierTest -DverificationSeconds=10
 
       - name: Upload Surefire reports on test failure
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: surefire-test-log
@@ -116,7 +116,7 @@ jobs:
         MAVEN_CENTRAL_TOKEN: ${{ secrets.nexus_password }}
 
     - name: Debug settings.xml
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: settings.xml
diff --git a/cross-compile.sh b/cross-compile.sh
index 1ebf92f..ebf92d7 100755
--- a/cross-compile.sh
+++ b/cross-compile.sh
@@ -3,7 +3,7 @@
 set -o errexit
 
 rm -rf lmdb
-git clone --depth 1 --branch LMDB_0.9.29 https://github.com/LMDB/lmdb.git
+git clone --depth 1 --branch LMDB_0.9.31 https://github.com/LMDB/lmdb.git
 pushd lmdb/libraries/liblmdb
 trap popd SIGINT