diff --git a/.test-conda-env-py3-requirements.txt b/.test-conda-env-py3-requirements.txt
index fa6c042636713d94361fb116af2afb80e4d9097e..105268a2f45c81aff2a67fe87ab9f2470ff86aba 100644
--- a/.test-conda-env-py3-requirements.txt
+++ b/.test-conda-env-py3-requirements.txt
@@ -1,5 +1,5 @@
 git+https://gitlab.tiker.net/inducer/boxtree
 git+https://github.com/inducer/pymbolic
-git+https://github.com/inducer/loopy
+git+https://gitlab.tiker.net/inducer/loopy@ensure-unpickles-equally-on-callbacks
 git+https://gitlab.tiker.net/inducer/sumpy
 git+https://github.com/inducer/meshmode
diff --git a/requirements.txt b/requirements.txt
index 8925c34ed4f7ccd7426bf4b153b8864bc3e77106..a68f61bc2a7741bcc909080b28c182b2d1b7da6c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ sympy==1.0
 git+https://github.com/inducer/modepy
 git+https://github.com/inducer/pyopencl
 git+https://github.com/inducer/islpy
-git+https://github.com/inducer/loopy
+git+https://gitlab.tiker.net/inducer/loopy@ensure-unpickles-equally-on-callbacks
 git+https://gitlab.tiker.net/inducer/boxtree
 git+https://github.com/inducer/meshmode
 git+https://gitlab.tiker.net/inducer/sumpy