diff --git a/stack.lts9.yaml b/stack.lts9.yaml
index fe5cd48e5..43cc9f511 100644
--- a/stack.lts9.yaml
+++ b/stack.lts9.yaml
@@ -25,5 +25,5 @@ extra-deps:
 - haddock-library-1.4.3
 - tagsoup-0.14.2
 - hs-bibutils-6.2.0.1
-- pandoc-citeproc-0.12.2
+- pandoc-citeproc-0.12.2.1
 resolver: lts-9.14
diff --git a/stack.yaml b/stack.yaml
index 450c7c3ae..60ecb0627 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -12,5 +12,6 @@ flags:
     debug: false
 packages:
 - '.'
-extra-deps: []
+extra-deps:
+- pandoc-citeproc-0.12.2.1
 resolver: lts-10.1