diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6104dd3..db82cb3 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -41,6 +41,21 @@ jobs:
                   CHECK: "true"
               name: Check that dhall files are formatted
               run: just format-dhall
+    dhallFreeze:
+        name: dhall-freeze
+        runs-on: ubuntu-latest
+        steps:
+            - uses: "actions/checkout@v2"
+            - name: Install asdf
+              uses: "asdf-vm/actions/setup@v1.0.0"
+            - name: Install asdf plugins
+              run: "./ci/asdf-add-plugins.sh"
+            - name: Install asdf tool versions and packages
+              run: "./ci/asdf-install.sh"
+            - env:
+                  CHECK: "true"
+              name: Check that dhall files are frozen
+              run: just freeze-dhall
     dhallLint:
         name: dhall-lint
         runs-on: ubuntu-latest
diff --git a/ci/dhall/jobs/dhall-freeze.dhall b/ci/dhall/jobs/dhall-freeze.dhall
new file mode 100644
index 0000000..98d0517
--- /dev/null
+++ b/ci/dhall/jobs/dhall-freeze.dhall
@@ -0,0 +1,19 @@
+let GitHubActions = (../imports.dhall).GitHubActions
+
+let Setup = ../setup.dhall
+
+let SetupSteps = Setup.SetupSteps
+
+let Job = Setup.Job
+
+in  Job::{
+    , name = Some "dhall-freeze"
+    , steps =
+          SetupSteps
+        # [ GitHubActions.Step::{
+            , name = Some "Check that dhall files are frozen"
+            , run = Some "just freeze-dhall"
+            , env = Some (toMap { CHECK = "true" })
+            }
+          ]
+    }
diff --git a/ci/dhall/workflow.dhall b/ci/dhall/workflow.dhall
index 09c3598..8f0dbf6 100644
--- a/ci/dhall/workflow.dhall
+++ b/ci/dhall/workflow.dhall
@@ -12,6 +12,8 @@ let dhallLint = ./jobs/dhall-lint.dhall
 
 let dhallCheck = ./jobs/dhall-check.dhall
 
+let dhallFreeze = ./jobs/dhall-freeze.dhall
+
 let prettier = ./jobs/prettier.dhall
 
 in  GitHubActions.Workflow::{
@@ -23,6 +25,7 @@ in  GitHubActions.Workflow::{
         , dhallFormat
         , dhallLint
         , dhallCheck
+        , dhallFreeze
         , checkPipeline
         , prettier
         }
diff --git a/scripts/dhall-freeze.sh b/scripts/dhall-freeze.sh
index 7810802..5234e51 100755
--- a/scripts/dhall-freeze.sh
+++ b/scripts/dhall-freeze.sh
@@ -29,6 +29,10 @@ function check() {
     "${file}"
   )
 
+  if [ "${CHECK:-"false"}" == "true" ]; then
+    FORMAT_ARGS+=("--check")
+  fi
+
   result=$(my_chronic "${CHECK_ARGS[@]}" 2>&1)
   rc=$?