diff --git a/exercises/fibonacci/solution.py b/exercises/fibonacci/solution.py
index 9847dd5..a6825e8 100644
--- a/exercises/fibonacci/solution.py
+++ b/exercises/fibonacci/solution.py
@@ -1,4 +1,4 @@
-SUBMIT = False
+SUBMIT = True
 
 
 def fibonacci(n: int) -> int:
@@ -14,4 +14,11 @@ def fibonacci(n: int) -> int:
     >>> fibonacci(10)
     55
     """
-    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 234e4d9..538fa03 100644
--- a/exercises/hello_world/solution.py
+++ b/exercises/hello_world/solution.py
@@ -1,4 +1,4 @@
-SUBMIT = False
+SUBMIT = True
 
 
 def hello_world() -> str:
@@ -8,7 +8,7 @@ def hello_world() -> str:
     >>> hello_world()
     'Hello, World!'
     """
-    pass
+    return "Hello, World!"
 
 
 # Workflow test internal