diff --git a/spec/ruby/core/thread/raise_spec.rb b/spec/ruby/core/thread/raise_spec.rb
index 20c8b149b8..f325622f24 100644
--- a/spec/ruby/core/thread/raise_spec.rb
+++ b/spec/ruby/core/thread/raise_spec.rb
@@ -6,8 +6,8 @@ describe "Thread#raise" do
   it "ignores dead threads" do
     t = Thread.new { :dead }
     Thread.pass while t.alive?
-    lambda {t.raise("Kill the thread")}.should_not raise_error
-    lambda {t.value}.should_not raise_error
+    -> { t.raise("Kill the thread") }.should_not raise_error
+    -> { t.value }.should_not raise_error
   end
 end
 
@@ -58,7 +58,7 @@ describe "Thread#raise on a sleeping thread" do
     ThreadSpecs.spin_until_sleeping(t)
 
     t.raise
-    lambda { t.value }.should raise_error(RuntimeError)
+    -> { t.value }.should raise_error(RuntimeError)
   end
 
   it "raises a RuntimeError when called with no arguments inside rescue" do
@@ -76,7 +76,7 @@ describe "Thread#raise on a sleeping thread" do
       ThreadSpecs.spin_until_sleeping(t)
       t.raise
     end
-    lambda {t.value}.should raise_error(RuntimeError)
+    -> { t.value }.should raise_error(RuntimeError)
   end
 end
 
@@ -120,7 +120,7 @@ describe "Thread#raise on a running thread" do
     end
 
     t.raise
-    lambda {t.value}.should raise_error(RuntimeError)
+    -> { t.value }.should raise_error(RuntimeError)
   end
 
   it "raises the given argument even when there is an active exception" do
@@ -139,7 +139,7 @@ describe "Thread#raise on a running thread" do
     rescue
       Thread.pass until raised
       t.raise RangeError
-      lambda {t.value}.should raise_error(RangeError)
+      -> { t.value }.should raise_error(RangeError)
     end
   end
 
@@ -160,7 +160,7 @@ describe "Thread#raise on a running thread" do
       Thread.pass until raised
       t.raise
     end
-    lambda {t.value}.should raise_error(RuntimeError)
+    -> { t.value }.should raise_error(RuntimeError)
   end
 end
 
@@ -176,6 +176,6 @@ describe "Thread#raise on same thread" do
         Thread.current.raise
       end
     end
-    lambda {t.value}.should raise_error(RuntimeError)
+    -> { t.value }.should raise_error(RuntimeError)
   end
 end