diff --git a/.gitignore b/.gitignore
index 52f84cc..8434dc5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@ packages
 
 # Include when developing application packages.
 pubspec.lock
+.packages
diff --git a/pubspec.yaml b/pubspec.yaml
index cbee728..dd2577b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,15 +4,15 @@ author: Sean Eagan <seaneagan1@gmail.com
 description: A programmatic API for den (https://github.com/seaneagan/den).
 homepage: https://github.com/seaneagan/den_api
 environment:
-  sdk: '>=1.0.0 <2.0.0'
+  sdk: '>=1.24.0 <2.0.0'
 dependencies:
-  contrast: '>=0.1.1 <0.2.0'
-  github: '>=2.1.6 <3.0.0'
-  path: '>=1.3.0 <2.0.0'
+  contrast: ^0.1.1
+  github: ^3.0.2
+  path: ^1.4.2
   pub_package_data: any
-  pub_semver: '>=1.1.0 <2.0.0'
-  source_span: '>=1.0.3 <2.0.0'
-  which: '>=0.1.3 <0.2.0'
-  yaml: '>=2.0.1+1 <3.0.0'
+  pub_semver: ^1.1.0
+  source_span: ^1.4.0
+  which: ^0.1.3
+  yaml: ^2.1.12
 dev_dependencies:
   unittest: '>=0.11.0 <12.0.0'