diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fb2171d..0b1b7bf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,16 +12,13 @@ jobs:
       fail-fast: false
       matrix:
         crystal_version:
-          - 1.0.0
-          - 1.1.0
-          - 1.2.0
-          - 1.3.0
+          - latest
         experimental:
           - false
     runs-on: ubuntu-latest
     continue-on-error: ${{ matrix.experimental }}
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: crystal-lang/install-crystal@v1
         with:
           crystal: ${{matrix.crystal_version}}
@@ -36,10 +33,8 @@ jobs:
       fail-fast: false
       matrix:
         crystal_version:
-          - 1.0.0
-          - 1.1.0
-          - 1.2.0
-          - 1.3.0
+          - 1.4.0
+          - latest
         experimental:
           - false
     runs-on: ubuntu-latest
diff --git a/shard.yml b/shard.yml
index ba71ae1..9ba4769 100644
--- a/shard.yml
+++ b/shard.yml
@@ -4,11 +4,11 @@ version: 0.4.7
 authors:
   - Paul Smith <paulcsmith0218@gmail.com>
 
-crystal: '>= 1.0.0'
+crystal: '>= 1.4.0'
 
 license: MIT
 
 development_dependencies:
   ameba:
     github: crystal-ameba/ameba
-    version: 0.13.4
+    version: ~> 1.0.0
diff --git a/spec/habitat_spec.cr b/spec/habitat_spec.cr
index 46cd72a..d072550 100644
--- a/spec/habitat_spec.cr
+++ b/spec/habitat_spec.cr
@@ -228,7 +228,7 @@ describe Habitat do
     FakeServer.settings.this_can_be_nil.should eq "not nil"
 
     FakeServer.settings.nilable_with_default.should eq "default"
-    FakeServer.configure { |settings| settings.nilable_with_default = nil }
+    FakeServer.configure(&.nilable_with_default = nil)
     FakeServer.settings.nilable_with_default.should be_nil
   end