diff --git a/.crystal-version b/.crystal-version
index 3eefcb9..dc1e644 100644
--- a/.crystal-version
+++ b/.crystal-version
@@ -1 +1 @@
-1.0.0
+1.6.0
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index d8c5f82..ed4a4d7 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -12,9 +12,9 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-16.04, macos-latest]
+        os: [ubuntu-20.04, macos-latest]
         include:
-          - os: ubuntu-16.04
+          - os: ubuntu-20.04
             artifact_name: thicket
             asset_name: thicket_${{ github.ref }}_linux-amd64
           - os: macos-latest
@@ -23,7 +23,7 @@ jobs:
       fail-fast: false
 
     container:
-      image: crystallang/crystal:1.0.0
+      image: crystallang/crystal:1.6.0
 
     steps:
       - name: Checkout code
diff --git a/.github/workflows/specs.yml b/.github/workflows/specs.yml
index d1670c9..9a07b3d 100644
--- a/.github/workflows/specs.yml
+++ b/.github/workflows/specs.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     container:
-      image: crystallang/crystal:1.0.0
+      image: crystallang/crystal:1.6.0
 
     steps:
       - uses: actions/checkout@v1
diff --git a/shard.lock b/shard.lock
index c05af2f..4f3e149 100644
--- a/shard.lock
+++ b/shard.lock
@@ -1,5 +1,2 @@
 version: 2.0
-shards:
-  ameba:
-    github: veelenga/ameba
-    version: 0.14.3
+shards: {}
diff --git a/shard.yml b/shard.yml
index 25ae455..7f8c6a7 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: thicket
-version: 0.1.5
+version: 0.1.6
 
 authors:
   - Taylor Thurlow <thurlow@hey.com>
@@ -14,6 +14,6 @@ targets:
 executables:
   - thicket
 
-crystal: 1.0.0
+crystal: 1.6.0
 
 license: MIT
diff --git a/src/thicket/version.cr b/src/thicket/version.cr
index 9ac14bf..97d64b5 100644
--- a/src/thicket/version.cr
+++ b/src/thicket/version.cr
@@ -1,3 +1,3 @@
 module Thicket
-  VERSION = "0.1.5"
+  VERSION = "0.1.6"
 end