diff --git a/.circleci/config.yml b/.circleci/config.yml
index 52b55e0..d825d6f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -13,7 +13,9 @@ jobs:
             git submodule update --init
       - run:
           name: "Extract version"
-          command: echo "export VERSION=${CIRCLE_TAG#offscreen-}" >> $BASH_ENV
+          command: |
+            echo "export VERSION=${CIRCLE_TAG#offscreen-}" >> $BASH_ENV
+            echo "Extracted version: ${CIRCLE_TAG#offscreen-}"
       - run:
           name: "Create VERSION file"
           command: echo "$VERSION" > VERSION
@@ -23,24 +25,49 @@ jobs:
       - run:
           name: "Create source tarball"
           command: |
-            echo "Creating tarball for $VERSION"
             mkdir -p /tmp/artifacts
             git-archive-all --force-submodules --prefix=offscreen-${VERSION}/ /tmp/artifacts/offscreen-${VERSION}.tar.gz
-      - store_artifacts:
-          path: /tmp/artifacts
-          destination: source-tarball
       - persist_to_workspace:
           root: /tmp/artifacts
           paths:
             - offscreen-*.tar.gz
 
+  calculate-checksum:
+    docker:
+      - image: cimg/python:3.10
+    steps:
+      - attach_workspace:
+          at: /tmp/artifacts
+      - run:
+          name: "Extract version"
+          command: |
+            echo "export VERSION=${CIRCLE_TAG#offscreen-}" >> $BASH_ENV
+            echo "Extracted version: ${CIRCLE_TAG#offscreen-}"
+      - run:
+          name: "Calculate SHA256 checksum"
+          command: |
+            sha256sum /tmp/artifacts/offscreen-${VERSION}.tar.gz > /tmp/artifacts/offscreen-${VERSION}.sha256
+      - run:
+          name: "Calculate SHA512 checksum"
+          command: |
+            sha512sum /tmp/artifacts/offscreen-${VERSION}.tar.gz > /tmp/artifacts/offscreen-${VERSION}.sha512
+      - store_artifacts:
+          path: /tmp/artifacts
+          destination: source-tarball
+
+filters: &filters
+  tags:
+    only: /^offscreen-.*/
+  branches:
+    ignore: /.*/
+
 workflows:
   version: 2
-  release:
+  my-release-workflow:
     jobs:
       - cut-release:
-          filters:
-            tags:
-              only: /^offscreen-.*/
-            branches:
-              ignore: /.*/
+          filters: *filters
+      - calculate-checksum:
+          filters: *filters
+          requires:
+            - cut-release