diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4465b6142..d614b5618 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+- Changed bit-mapping for `httpx` and `fastapi` integrations
+([#1239](https://github.com/census-instrumentation/opencensus-python/pull/1239))
+
 # 0.11.3
 Released 2023-09-18
 
diff --git a/opencensus/trace/integrations.py b/opencensus/trace/integrations.py
index 7a58f4911..59934881d 100644
--- a/opencensus/trace/integrations.py
+++ b/opencensus/trace/integrations.py
@@ -32,8 +32,8 @@ class _Integrations:
     PYRAMID = 512
     REQUESTS = 1024
     SQLALCHEMY = 2056
-    HTTPX = 4096
-    FASTAPI = 8192
+    HTTPX = 16777216
+    FASTAPI = 4194304
 
 
 def get_integrations():