diff --git a/.gitea/workflows/test-dotnet.yaml b/.gitea/workflows/test-dotnet.yaml
index f57fdf3..0ae4dae 100644
--- a/.gitea/workflows/test-dotnet.yaml
+++ b/.gitea/workflows/test-dotnet.yaml
@@ -33,9 +33,11 @@ jobs:
       uses: actions/setup-dotnet@v4
       with:
         global-json-file: global.json
+        cache: true
+        cache-dependency-path: '**/packages.lock.json'
 
     - name: Restore dependencies
-      run: dotnet restore --disable-parallel
+      run: dotnet restore --locked-mode --disable-parallel
 
     - name: Build
       run: dotnet build --configuration Release --no-restore
diff --git a/0-source/Just.PreciseMath/packages.lock.json b/0-source/Just.PreciseMath/packages.lock.json
new file mode 100644
index 0000000..4a91a8c
--- /dev/null
+++ b/0-source/Just.PreciseMath/packages.lock.json
@@ -0,0 +1,6 @@
+{
+  "version": 1,
+  "dependencies": {
+    "net10.0": {}
+  }
+}
\ No newline at end of file
diff --git a/1-tests/Just.PreciseMath.Tests/packages.lock.json b/1-tests/Just.PreciseMath.Tests/packages.lock.json
new file mode 100644
index 0000000..714fb55
--- /dev/null
+++ b/1-tests/Just.PreciseMath.Tests/packages.lock.json
@@ -0,0 +1,267 @@
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+        "type": "Project"
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/2-benchmarks/Just.PreciseMath.Benchmarks/packages.lock.json b/2-benchmarks/Just.PreciseMath.Benchmarks/packages.lock.json
new file mode 100644
index 0000000..dc77c2b
--- /dev/null
+++ b/2-benchmarks/Just.PreciseMath.Benchmarks/packages.lock.json
@@ -0,0 +1,174 @@
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+        "dependencies": {
+          "Microsoft.Extensions.DependencyInjection": "6.0.0",
+          "Microsoft.Extensions.DependencyInjection.Abstractions": "6.0.0",
+          "Microsoft.Extensions.Logging.Abstractions": "6.0.0",
+          "Microsoft.Extensions.Options": "6.0.0"
+        }
+      },
+      "Microsoft.Extensions.Logging.Abstractions": {
+        "type": "Transitive",
+        "resolved": "6.0.0",
+        "contentHash": "/HggWBbTwy8TgebGSX5DBZ24ndhzi93sHUBDvP1IxbZD7FDokYzdAr6+vbWGjw2XAfR2EJ1sfKUotpjHnFWPxA=="
+      },
+      "Microsoft.Extensions.Options": {
+        "type": "Transitive",
+        "resolved": "6.0.0",
+        "contentHash": "dzXN0+V1AyjOe2xcJ86Qbo233KHuLEY0njf/P2Kw8SfJU+d45HNS2ctJdnEnrWbM9Ye2eFgaC5Mj9otRMU6IsQ==",
+        "dependencies": {
+          "Microsoft.Extensions.DependencyInjection.Abstractions": "6.0.0",
+          "Microsoft.Extensions.Primitives": "6.0.0"
+        }
+      },
+      "Microsoft.Extensions.Primitives": {
+        "type": "Transitive",
+        "resolved": "6.0.0",
+        "contentHash": "9+PnzmQFfEFNR9J2aDTfJGGupShHjOuGw4VUv+JB044biSHrnmCIMD+mJHmb2H7YryrfBEXDurxQ47gJZdCKNQ=="
+      },
+      "Perfolizer": {
+        "type": "Transitive",
+        "resolved": "0.6.1",
+        "contentHash": "CR1QmWg4XYBd1Pb7WseP+sDmV8nGPwvmowKynExTqr3OuckIGVMhvmN4LC5PGzfXqDlR295+hz/T7syA1CxEqA==",
+        "dependencies": {
+          "Pragmastat": "3.2.4"
+        }
+      },
+      "Pragmastat": {
+        "type": "Transitive",
+        "resolved": "3.2.4",
+        "contentHash": "I5qFifWw/gaTQT52MhzjZpkm/JPlfjSeO/DTZJjO7+hTKI+0aGRgOgZ3NN6D96dDuuqbIAZSeA5RimtHjqrA2A=="
+      },
+      "System.CodeDom": {
+        "type": "Transitive",
+        "resolved": "9.0.5",
+        "contentHash": "cuzLM2MWutf9ZBEMPYYfd0DXwYdvntp7VCT6a/wvbKCa2ZuvGmW74xi+YBa2mrfEieAXqM4TNKlMmSnfAfpUoQ=="
+      },
+      "System.Management": {
+        "type": "Transitive",
+        "resolved": "9.0.5",
+        "contentHash": "n6o9PZm9p25+zAzC3/48K0oHnaPKTInRrxqFq1fi/5TPbMLjuoCm/h//mS3cUmSy+9AO1Z+qsC/Ilt/ZFatv5Q==",
+        "dependencies": {
+          "System.CodeDom": "9.0.5"
+        }
+      },
+      "System.Reflection.TypeExtensions": {
+        "type": "Transitive",
+        "resolved": "4.7.0",
+        "contentHash": "VybpaOQQhqE6siHppMktjfGBw1GCwvCqiufqmP8F1nj7fTUNtW35LOEt3UZTEsECfo+ELAl/9o9nJx3U91i7vA=="
+      },
+      "just.precisemath": {
+        "type": "Project"
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/Directory.Build.props b/Directory.Build.props
index eb04edc..34e4b0c 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -17,5 +17,7 @@
 
     <NuGetAudit>true</NuGetAudit>
     <NuGetAuditMode>all</NuGetAuditMode>
+    <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
+    <DisableImplicitNuGetFallbackFolder>true</DisableImplicitNuGetFallbackFolder>
   </PropertyGroup>
 </Project>
diff --git a/README.md b/README.md
index cd7d17f..23d117c 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,13 @@ dotnet test --solution Just.PreciseMath.slnx -c Release --no-build
 dotnet format Just.PreciseMath.slnx --verify-no-changes --no-restore
 ```
 
+Commit each project's `packages.lock.json` with dependency changes. CI caches
+NuGet packages using those lock files and always runs `dotnet restore --locked-mode`,
+including on cache hits. After intentional dependency updates, run
+`dotnet restore --force-evaluate` and review the updated lock files before committing.
+Gitea's runner cache must be reachable from the job container, with persistent
+storage if the runner itself is recreated. No build outputs are cached.
+
 The initial smoke test checks that `DoubleDouble.One` exposes high and low
 components of `1.0` and `0.0`. It exercises the test/coverage pipeline, not the
 numerical accuracy of the planned library.