diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 0c2948a..8af4d0d 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -36,6 +36,13 @@ jobs:
           # a pull request then we can check out the head.
           fetch-depth: 2
 
+      # GH Actions runner uses go1.20 by default, so we need to install our own version.
+      # https://github.com/github/codeql-action/issues/1842#issuecomment-1704398087
+      - name: Install Go from go.mod
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
       # If this run was triggered by a pull request event, then checkout
       # the head of the pull request instead of the merge commit.
       - run: git checkout HEAD^2
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 8443227..82d54bb 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -23,7 +23,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.19
+          go-version-file: go.mod
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v5.0.0
         with:
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 58d5017..7d1903d 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -36,16 +36,15 @@ jobs:
     needs: [yamllint, asknancy]
     strategy:
       matrix:
-        go-version: [1.18.x, 1.19.x]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - name: Install Go ${{ matrix.go-version }}
-        uses: actions/setup-go@v5
-        with:
-          go-version: ${{ matrix.go-version }}
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: Install Go from go.mod
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
       - name: Cache code
         uses: actions/cache@v3
         with:
diff --git a/go.mod b/go.mod
index 3d1551f..4e0f342 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/BuxOrg/bux-models
 
-go 1.18
+go 1.21
 
 require github.com/stretchr/testify v1.8.4