diff --git a/databuilder/requirements.prod.in b/databuilder/requirements.prod.in
index 4cb0c37f8..7d53900d4 100644
--- a/databuilder/requirements.prod.in
+++ b/databuilder/requirements.prod.in
@@ -6,4 +6,7 @@ snex
 
 # Dependabot doesn't seem to touch this dependency, likely because it's pinned,
 # so we have a script to update it, run: just databuilder/upgrade-databuilder
-https://github.com/opensafely-core/databuilder/archive/refs/tags/v0.40.6.zip
+#
+# The release of Data Builder is currently broken; https://github.com/opensafely-core/databuilder/issues/651
+# So pin this to a commit on main for now, until that's fixed.
+https://github.com/opensafely-core/databuilder/archive/9aaf5c157087317959d18ad845cc5b18ae8cee14.zip
diff --git a/databuilder/requirements.prod.txt b/databuilder/requirements.prod.txt
index 7e5a5d7c0..f7d5b4f7e 100644
--- a/databuilder/requirements.prod.txt
+++ b/databuilder/requirements.prod.txt
@@ -160,8 +160,8 @@ numpy==1.23.1 \
     # via
     #   pandas
     #   pyarrow
-opensafely-databuilder @ https://github.com/opensafely-core/databuilder/archive/refs/tags/v0.40.6.zip \
-    --hash=sha256:fbe2e9ad09397da56af430ddb8bd2c3a04e71bff79cc3ba6d30207a592d3cd7b
+opensafely-databuilder @ https://github.com/opensafely-core/databuilder/archive/9aaf5c157087317959d18ad845cc5b18ae8cee14.zip \
+    --hash=sha256:43fcd4e6d1579d67b40c4db5f37460381916faffed2e8d77714e4c07e68a9dba
     # via -r databuilder/requirements.prod.in
 pandas==1.4.3 \
     --hash=sha256:07238a58d7cbc8a004855ade7b75bbd22c0db4b0ffccc721556bab8a095515f6 \