diff --git a/pyproject.toml b/pyproject.toml
index fa75021e..c5da6966 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -83,7 +83,7 @@ members = ["execute_llvm"]
 execute-llvm = { workspace = true }
 
 # Uncomment these to test the latest dependency version during development
-hugr = { git = "https://github.com/CQCL/hugr", subdirectory = "hugr-py", branch = "main" }
+hugr = { git = "https://github.com/CQCL/hugr", subdirectory = "hugr-py", rev = "b05a419e08dfcccf10fa081a22fc83af0d11502b" }
 # tket2-exts = { git = "https://github.com/CQCL/tket2", subdirectory = "tket2-exts", rev = "eb7cc63"}
 # tket2 = { git = "https://github.com/CQCL/tket2", subdirectory = "tket2-py", rev = "eb7cc63"}
 
diff --git a/uv.lock b/uv.lock
index a9001a70..1b9dcb24 100644
--- a/uv.lock
+++ b/uv.lock
@@ -614,7 +614,7 @@ test = [
 [package.metadata]
 requires-dist = [
     { name = "graphviz", specifier = ">=0.20.1,<0.21" },
-    { name = "hugr", git = "https://github.com/CQCL/hugr?subdirectory=hugr-py&branch=main" },
+    { name = "hugr", git = "https://github.com/CQCL/hugr?subdirectory=hugr-py&rev=b05a419e08dfcccf10fa081a22fc83af0d11502b" },
     { name = "networkx", specifier = ">=3.2.1,<4" },
     { name = "pydantic", specifier = ">=2.7.0b1,<3" },
     { name = "pytket", marker = "extra == 'pytket'", specifier = ">=1.34" },
@@ -679,7 +679,7 @@ test = [
 [[package]]
 name = "hugr"
 version = "0.10.1"
-source = { git = "https://github.com/CQCL/hugr?subdirectory=hugr-py&branch=main#b05a419e08dfcccf10fa081a22fc83af0d11502b" }
+source = { git = "https://github.com/CQCL/hugr?subdirectory=hugr-py&rev=b05a419e08dfcccf10fa081a22fc83af0d11502b#b05a419e08dfcccf10fa081a22fc83af0d11502b" }
 dependencies = [
     { name = "graphviz" },
     { name = "pydantic" },