diff --git a/stack.yaml b/stack.yaml
index dce09f030..b8ab89a22 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -108,6 +108,8 @@ extra-deps:
   - unidecode-0.1.0.4@sha256:99581ee1ea334a4596a09ae3642e007808457c66893b587e965b31f15cbf8c4d,1144
   # - wai-middleware-prometheus-1.0.0@sha256:1625792914fb2139f005685be8ce519111451cfb854816e430fbf54af46238b4,1314
   - hlint-test-0.1.0.0@sha256:e427c0593433205fc629fb05b74c6b1deb1de72d1571f26142de008f0d5ee7a9,1814
+  - servant-0.20.1
+  - servant-client-core-0.20
   - servant-quickcheck-0.0.10.0@sha256:1d5849d703c2487752f8fc7391cca7c998ee24f54ca0bb72d238bf99b64ac667,3755
   - servant-flatten-0.2@sha256:276896f7c5cdec5b8f8493f6205fded0cc602d050b58fdb09a6d7c85c3bb0837,1234
   - network-arbitrary-0.7.0.0@sha256:0cd381c80ae20c16048936edcdb018b1d9fbe2b6ac8c44e908df403a5c6d7cd5,2520
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 80e611ee2..a5fce119c 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -438,6 +438,20 @@ packages:
       size: 442
   original:
     hackage: hlint-test-0.1.0.0@sha256:e427c0593433205fc629fb05b74c6b1deb1de72d1571f26142de008f0d5ee7a9,1814
+- completed:
+    hackage: servant-0.20.1@sha256:3f0850b019cfcb66501048e6e881a005b2decfee9abb36efc8a2bb5e4f76fe8c,5626
+    pantry-tree:
+      sha256: d8a0d5a18e42b5c187f262f1f96a197721ab6cf385347ecfd1b47f422a732717
+      size: 2873
+  original:
+    hackage: servant-0.20.1
+- completed:
+    hackage: servant-client-core-0.20@sha256:fb4d8c3ee3bcb09afbea93994cc9d0d54278d5460213b8002c36b08deb76070b,3817
+    pantry-tree:
+      sha256: 333727cf0c2c4e4822615dc16ba505fe29a905fc6d6794832bc09c165102315a
+      size: 1446
+  original:
+    hackage: servant-client-core-0.20
 - completed:
     hackage: servant-quickcheck-0.0.10.0@sha256:1d5849d703c2487752f8fc7391cca7c998ee24f54ca0bb72d238bf99b64ac667,3755
     pantry-tree: