diff --git a/docs/retype.yml b/docs/retype.yml
index e5063e0a..e4f41e54 100644
--- a/docs/retype.yml
+++ b/docs/retype.yml
@@ -3,7 +3,7 @@ output: .retype
 url: https://pocketpy.dev
 branding:
   title: pocketpy
-  label: v2.0.8
+  label: v2.0.9
   logo: "./static/logo.png"
 favicon: "./static/logo.png"
 meta:
diff --git a/include/pocketpy/config.h b/include/pocketpy/config.h
index 8b033e90..43af92a5 100644
--- a/include/pocketpy/config.h
+++ b/include/pocketpy/config.h
@@ -1,10 +1,10 @@
 #pragma once
 // clang-format off
 
-#define PK_VERSION				"2.0.8"
+#define PK_VERSION				"2.0.9"
 #define PK_VERSION_MAJOR            2
 #define PK_VERSION_MINOR            0
-#define PK_VERSION_PATCH            8
+#define PK_VERSION_PATCH            9
 
 /*************** feature settings ***************/
 // Whether to compile os-related modules or not
diff --git a/src/compiler/compiler.c b/src/compiler/compiler.c
index 5a7ab101..188850f1 100644
--- a/src/compiler/compiler.c
+++ b/src/compiler/compiler.c
@@ -63,6 +63,7 @@ typedef struct Ctx {
     bool is_compiling_class;
     c11_vector /*T=Expr* */ s_expr;
     c11_smallmap_n2i global_names;
+    c11_smallmap_s2n co_consts_string_dedup_map;
 } Ctx;
 
 typedef struct Expr Expr;
@@ -1080,6 +1081,7 @@ static void Ctx__ctor(Ctx* self, CodeObject* co, FuncDecl* func, int level) {
     self->is_compiling_class = false;
     c11_vector__ctor(&self->s_expr, sizeof(Expr*));
     c11_smallmap_n2i__ctor(&self->global_names);
+    c11_smallmap_s2n__ctor(&self->co_consts_string_dedup_map);
 }
 
 static void Ctx__dtor(Ctx* self) {
@@ -1089,6 +1091,12 @@ static void Ctx__dtor(Ctx* self) {
     }
     c11_vector__dtor(&self->s_expr);
     c11_smallmap_n2i__dtor(&self->global_names);
+    // free the dedup map
+    c11__foreach(c11_smallmap_s2n_KV, &self->co_consts_string_dedup_map, p_kv) {
+        const char* p = p_kv->key.data;
+        PK_FREE((void*)p);
+    }
+    c11_smallmap_s2n__dtor(&self->co_consts_string_dedup_map);
 }
 
 static int Ctx__prepare_loop_divert(Ctx* self, int line, bool is_break) {
@@ -1198,10 +1206,28 @@ static int Ctx__add_varname(Ctx* self, py_Name name) {
 }
 
 static int Ctx__add_const_string(Ctx* self, c11_sv key) {
-    py_Ref p = c11_vector__emplace(&self->co->consts);
-    py_newstrv(p, key);
-    int index = self->co->consts.length - 1;
-    return index;
+    if(key.size > 100) {
+        py_Ref tmp = c11_vector__emplace(&self->co->consts);
+        py_newstrv(tmp, key);
+        int index = self->co->consts.length - 1;
+        return index;
+    }
+    uint16_t* val = c11_smallmap_s2n__try_get(&self->co_consts_string_dedup_map, key);
+    if(val) {
+        return *val;
+    } else {
+        py_Ref tmp = c11_vector__emplace(&self->co->consts);
+        py_newstrv(tmp, key);
+        int index = self->co->consts.length - 1;
+        // dedup
+        char* new_buf = PK_MALLOC(key.size + 1);
+        memcpy(new_buf, key.data, key.size);
+        new_buf[key.size] = 0;
+        c11_smallmap_s2n__set(&self->co_consts_string_dedup_map,
+                              (c11_sv){new_buf, key.size},
+                              index);
+        return index;
+    }
 }
 
 static int Ctx__add_const(Ctx* self, py_Ref v) {
diff --git a/src/interpreter/heap.c b/src/interpreter/heap.c
index e3bd1631..37b1d2ff 100644
--- a/src/interpreter/heap.c
+++ b/src/interpreter/heap.c
@@ -44,7 +44,7 @@ void ManagedHeap__collect_if_needed(ManagedHeap* self) {
     const int lower = PK_GC_MIN_THRESHOLD / 2;
     float free_ratio = (float)avg_freed / self->gc_threshold;
     int new_threshold = self->gc_threshold * (1 / free_ratio);
-    printf("gc_threshold=%d, avg_freed=%d, new_threshold=%d\n", self->gc_threshold, avg_freed, new_threshold);
+    // printf("gc_threshold=%d, avg_freed=%d, new_threshold=%d\n", self->gc_threshold, avg_freed, new_threshold);
     self->gc_threshold = c11__min(c11__max(new_threshold, lower), upper);
 }