diff --git a/src/memory.cpp b/src/memory.cpp
index 9b37351..1f3f620 100644
--- a/src/memory.cpp
+++ b/src/memory.cpp
@@ -79,6 +79,14 @@ void Memory::update(string identifier, EvalResult value) {
             scope.vars[identifier].initialized = true;
             return;
         }
+        if (scope.type == ScopeType::Function) {
+            Closure closure = std::get<1>(std::get<Function>(scope.fn->value));
+            if (closure.contains(identifier)) {
+                MemoryVar& var = closure.at(identifier);
+                var.value = value;
+                var.initialized = true;
+            }
+        }
     }
     
     throw exception();
diff --git a/test/functions.cpp b/test/functions.cpp
index 567af3f..4c99acd 100644
--- a/test/functions.cpp
+++ b/test/functions.cpp
@@ -110,5 +110,47 @@ int main() {
         true
     );
 
+    _TEST_ASSERT(
+        _TEST_NO_EXCEPTION(get<int>(execute(R"(
+            int x = 1;
+            int a() {
+                return x;
+            }
+            int b() {
+                int x = 2;
+                return a();
+            }
+            b();
+            )")) == 1),
+        "Closure capture",
+        true
+    );
+
+    _TEST_ASSERT(
+        _TEST_NO_EXCEPTION(get<int>(execute(R"(
+            int x = 1;
+            int a() {
+                return x;
+            }
+            x = 2;
+            a();
+            )")) == 2),
+        "Closure mutation externe",
+        true
+    );
+
+    _TEST_ASSERT(
+        _TEST_NO_EXCEPTION(get<int>(execute(R"(
+            int x = 1;
+            void a() {
+                x = 2;
+            }
+            a();
+            x;
+            )")) == 2),
+        "Closure mutation interne",
+        true
+    );
+
     return 0;
 }
\ No newline at end of file