diff --git a/.github/workflows/caching.yml b/.github/workflows/caching.yml
index 76c7fd6dac..ae08b0a89c 100644
--- a/.github/workflows/caching.yml
+++ b/.github/workflows/caching.yml
@@ -164,6 +164,9 @@ jobs:
 
       - if: steps.compiled-deps.outputs.cache-hit != 'true'
         name: Download all sources
+        #  2021-12-21: FIXME: Please, remove `continue-on-error: true` before merge.
+        #  This was added because Cabal meets unsolvable constraints: https://github.com/haskell/haskell-language-server/runs/4596155381?check_suite_focus=true
+        continue-on-error: true
         run: |
           cabal $cabalBuild --only-download
 
diff --git a/cabal-ghc901.project b/cabal-ghc901.project
index 9dc81d3b56..e0a7d7adc1 100644
--- a/cabal-ghc901.project
+++ b/cabal-ghc901.project
@@ -37,7 +37,7 @@ package *
 
 write-ghc-environment-files: never
 
-index-state: 2021-11-29T12:30:11Z
+index-state: 2021-11-29T12:30:12Z
 
 constraints:
   -- These plugins don't work on GHC9 yet
diff --git a/cabal-ghc921.project b/cabal-ghc921.project
index b5a0c813aa..80ecd6979d 100644
--- a/cabal-ghc921.project
+++ b/cabal-ghc921.project
@@ -52,7 +52,7 @@ package *
 
 write-ghc-environment-files: never
 
-index-state: 2021-12-18T00:00:03Z
+index-state: 2021-12-18T00:00:04Z
 
 constraints:
   -- These plugins doesn't work on GHC92 yet
diff --git a/cabal.project b/cabal.project
index c109f3ef75..81640c9de9 100644
--- a/cabal.project
+++ b/cabal.project
@@ -40,7 +40,7 @@ package *
 
 write-ghc-environment-files: never
 
-index-state: 2021-11-29T12:30:11Z
+index-state: 2021-11-29T12:30:12Z
 
 constraints:
     hyphenation +embed