diff --git a/exercises/fibonacci/solution.py b/exercises/fibonacci/solution.py
index a236a2e..178e98b 100644
--- a/exercises/fibonacci/solution.py
+++ b/exercises/fibonacci/solution.py
@@ -1,6 +1,10 @@
-SUBMIT = False
+SUBMIT = True
 
 
 def fibonacci() -> int | None:
     """Implement the classic sequence."""
-    pass
+        if n == 0: return 0
+    if n == 1: return 1
+    a, b = 0, 1
+    for _ in range(2, n + 1): a, b = b, a + b
+    return b
diff --git a/exercises/hello_world/solution.py b/exercises/hello_world/solution.py
index 2c762e2..14b0838 100644
--- a/exercises/hello_world/solution.py
+++ b/exercises/hello_world/solution.py
@@ -1,6 +1,6 @@
-SUBMIT = False
+SUBMIT = True
 
 
 def hello_world() -> int | None:
     """The classic first step in programming."""
-    pass
+    return "Hello, World!"