diff --git a/Dockerfile b/Dockerfile
index 7da65821..60ba4ff5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,10 +23,11 @@ RUN set -x \
 RUN set -x \
     && add-apt-repository ppa:george-edison55/cmake-3.x
 
+ENV QT_PPA=qt591
 ENV QT_VERSION=qt59
 
 RUN set -x \
-    && add-apt-repository --yes ppa:beineri/opt-${QT_VERSION}-trusty
+    && add-apt-repository --yes ppa:beineri/opt-${QT_PPA}-trusty
 
 
 RUN set -x \
diff --git a/release-tool b/release-tool
index 680cdca2..24d64f90 100755
--- a/release-tool
+++ b/release-tool
@@ -615,7 +615,7 @@ build() {
         logInfo "Launching Docker container to compile sources..."
         
         docker run --name "$DOCKER_CONTAINER_NAME" --rm \
-            --cap-add SYS_ADMIN --device /dev/fuse \
+            --cap-add SYS_ADMIN --security-opt apparmor:unconfined --device /dev/fuse \
             -e "CC=${CC}" -e "CXX=${CXX}" \
             -v "$(realpath "$SRC_DIR"):/keepassxc/src:ro" \
             -v "$(realpath "$OUTPUT_DIR"):/keepassxc/out:rw" \