diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index ed3e6b1..486620a 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,12 +1,45 @@
 version: 2
 updates:
-- package-ecosystem: cargo
-  directory: "/"
-  schedule:
-    interval: daily
-- package-ecosystem: github-actions
-  directory: "/"
-  schedule:
-    interval: daily
-  ignore:
-    - dependency-name: dtolnay/rust-toolchain
+  # bump major and minor updates as soon as available
+  - package-ecosystem: cargo
+    target-branch: main # see https://github.com/dependabot/dependabot-core/issues/1778#issuecomment-1988140219
+    directory: /
+    schedule:
+      interval: daily
+    commit-message:
+      prefix: chore
+      include: scope
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-patch"
+
+  # bundle patch updates together on a monthly basis
+  # (note that security updates will be bumped as soon as available)
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: monthly
+    commit-message:
+      prefix: chore
+      include: scope
+    groups:
+      patch-updates:
+        update-types:
+          - patch
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-minor"
+          - "version-update:semver-major"
+
+  # bump actions as soon as available
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+    commit-message:
+      prefix: chore
+      include: scope
+    ignore:
+      - dependency-name: dtolnay/rust-toolchain
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1406b70..35167ad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
-      - run: cargo test
+      - run: cargo test --locked
 
   test-persistence:
     name: test persistence
diff --git a/.gitignore b/.gitignore
index 0b01631..542615f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,5 @@
 
 /target
 **/*.rs.bk
-Cargo.lock
 
 /docs/book/book
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..3d2c8f1
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,499 @@
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