diff --git a/src/spectator/example_group.cr b/src/spectator/example_group.cr
index 5ac2785..d62f7dd 100644
--- a/src/spectator/example_group.cr
+++ b/src/spectator/example_group.cr
@@ -118,7 +118,7 @@ module Spectator
     end
 
     # Checks whether all examples in the group have been run.
-    def finished? : Bool
+    def finished?
       children.all?(&.finished?)
     end
 
diff --git a/src/spectator/example_hooks.cr b/src/spectator/example_hooks.cr
index 2e87e50..db6eef9 100644
--- a/src/spectator/example_hooks.cr
+++ b/src/spectator/example_hooks.cr
@@ -52,7 +52,7 @@ module Spectator
     # in addition to a block passed to this method.
     # To call the block and all "around-each" hooks,
     # just invoke `Proc#call` on the returned proc.
-    def wrap_around_each(&block : ->)
+    def wrap_around_each(&block : ->) : ->
       wrapper = block
       # Must wrap in reverse order,
       # otherwise hooks will run in the wrong order.
diff --git a/src/spectator/pending_example.cr b/src/spectator/pending_example.cr
index 897b134..f485ec4 100644
--- a/src/spectator/pending_example.cr
+++ b/src/spectator/pending_example.cr
@@ -5,7 +5,7 @@ module Spectator
   # This class will not run example code.
   abstract class PendingExample < Example
     # Returns a pending result.
-    private def run_impl : Result
+    private def run_impl
       PendingResult.new(self)
     end
   end
diff --git a/src/spectator/root_example_group.cr b/src/spectator/root_example_group.cr
index 83ee641..f169064 100644
--- a/src/spectator/root_example_group.cr
+++ b/src/spectator/root_example_group.cr
@@ -5,7 +5,7 @@ module Spectator
   # The root has no parent.
   class RootExampleGroup < ExampleGroup
     # Dummy value - this should never be used.
-    def what : String
+    def what
       "ROOT"
     end
 
diff --git a/src/spectator/runnable_example.cr b/src/spectator/runnable_example.cr
index 6e06eb2..2879cb1 100644
--- a/src/spectator/runnable_example.cr
+++ b/src/spectator/runnable_example.cr
@@ -8,7 +8,7 @@ module Spectator
   abstract class RunnableExample < Example
     # Runs the example, hooks, and captures the result
     # and translates to a usable result.
-    def run_impl : Result
+    def run_impl
       result = capture_result
       expectations = Internals::Harness.current.expectations
       translate_result(result, expectations)
@@ -35,7 +35,7 @@ module Spectator
 
     # Runs all hooks and the example code.
     # A captured result is returned.
-    private def capture_result : ResultCapture
+    private def capture_result
       ResultCapture.new.tap do |result|
         # Get the proc that will call around-each hooks and the example.
         wrapper = wrap_run_example(result)
@@ -57,7 +57,7 @@ module Spectator
 
     # Creates a proc that runs the test code
     # and captures the result.
-    private def wrap_run_example(result) : ->
+    private def wrap_run_example(result)
       # Wrap the method that runs and captures
       # the test code with the around-each hooks.
       group.wrap_around_each_hooks do
diff --git a/src/spectator/runner.cr b/src/spectator/runner.cr
index 21b13ee..49c2a34 100644
--- a/src/spectator/runner.cr
+++ b/src/spectator/runner.cr
@@ -28,7 +28,7 @@ module Spectator
 
     # Runs a single example and returns the result.
     # The formatter is given the example and result information.
-    private def run_example(example) : Result
+    private def run_example(example)
       @config.formatter.start_example(example)
       Internals::Harness.run(example).tap do |result|
         @config.formatter.end_example(result)