diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index dc9197b..47c696d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -54,7 +54,7 @@ jobs:
       - uses: actions/checkout@master
         with:
           repository: pypy/pypy
-          ref: release-pypy2.7-v7.3.9
+          ref: release-pypy2.7-v7.3.15
           path: pypy
       - name: Build
         run: |
diff --git a/Makefile b/Makefile
index 2f7a5e7..5dbb95d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 
 RPYTHON?=../pypy/rpython/bin/rpython
-RPYTHONFLAGS?=--opt=jit
+RPYTHONFLAGS?=--opt=jit --translation-jit_opencoder_model=big
 
 
 all: aheui-c aheui-py