diff --git a/eos-s3/requirements.txt b/eos-s3/requirements.txt
index 4f07802..8cd8de6 100644
--- a/eos-s3/requirements.txt
+++ b/eos-s3/requirements.txt
@@ -1,4 +1,4 @@
 python-constraint
 serial
 git+https://github.com/QuickLogic-Corp/quicklogic-fasm@aaf4c314a165b6185b0983019d8aae4d0d4db6cb
-https://github.com/chipsalliance/f4pga/archive/main.zip#subdirectory=f4pga
+https://github.com/chipsalliance/f4pga/archive/27eca4f35db3c4e04ce255ab319611774de9b9a1.zip#subdirectory=f4pga
diff --git a/xc7/requirements.txt b/xc7/requirements.txt
index 321fb3c..0ede90f 100644
--- a/xc7/requirements.txt
+++ b/xc7/requirements.txt
@@ -14,7 +14,7 @@ sympy
 textx
 yapf==0.24.0
 python-constraint
-https://github.com/chipsalliance/f4pga/archive/main.zip#subdirectory=f4pga
+https://github.com/chipsalliance/f4pga/archive/27eca4f35db3c4e04ce255ab319611774de9b9a1.zip#subdirectory=f4pga
 fasm
 git+https://github.com/f4pga/prjxray.git@ae546d6b7648bf4df9cf63f0b25b2028b5623c43#egg=prjxray
 git+https://github.com/chipsalliance/f4pga-xc-fasm.git@25dc605c9c0896204f0c3425b52a332034cf5e5c#egg=xc-fasm