diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 76cf55a..832e988 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
             output
 
       - name: Build source
-        run: spago build --censor-stats --strict --pedantic-packages
+        run: spago build --censor-stats --strict --ensure-ranges --pedantic-packages
 
       - name: Run tests
         run: spago test --offline --censor-stats --strict --pedantic-packages -- --censor-codes=UserDefinedWarning
diff --git a/bower.json b/bower.json
index 028e626..a96a0d9 100644
--- a/bower.json
+++ b/bower.json
@@ -4,11 +4,5 @@
   "repository": {
     "type": "git",
     "url": "https://github.com/purescript-contrib/purescript-github-actions-toolkit"
-  },
-  "ignore": [
-    "**/.*",
-    "node_modules",
-    "bower_components",
-    "output"
-  ]
+  }
 }
diff --git a/spago.yaml b/spago.yaml
index 577cabc..b7759b1 100644
--- a/spago.yaml
+++ b/spago.yaml
@@ -7,19 +7,19 @@ package:
       githubOwner: purescript-contrib
       githubRepo: purescript-github-actions-toolkit
   dependencies:
-    - aff
-    - aff-promise
-    - control
-    - effect
-    - exceptions
-    - foreign-object
-    - maybe
-    - node-buffer
-    - node-path
-    - node-streams
-    - nullable
-    - prelude
-    - transformers
+    - aff: ">=8.0.0 <9.0.0"
+    - aff-promise: ">=4.0.0 <5.0.0"
+    - control: ">=6.0.0 <7.0.0"
+    - effect: ">=4.0.0 <5.0.0"
+    - exceptions: ">=6.1.0 <7.0.0"
+    - foreign-object: ">=4.1.0 <5.0.0"
+    - maybe: ">=6.0.0 <7.0.0"
+    - node-buffer: ">=9.0.0 <10.0.0"
+    - node-path: ">=5.0.0 <6.0.0"
+    - node-streams: ">=9.0.0 <10.0.0"
+    - nullable: ">=6.0.0 <7.0.0"
+    - prelude: ">=6.0.1 <7.0.0"
+    - transformers: ">=6.1.0 <7.0.0"
   test:
     main: Test.Main
     dependencies: