diff --git a/build-constraints.yaml b/build-constraints.yaml
index 23cd3706..adbf875b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -755,7 +755,7 @@ packages:
         - cryptonite-conduit
         - streaming-commons
 
-        - alex
+        - alex < 3.2.7 || > 3.2.7
         - async
         - base16-bytestring
         - csv-conduit
@@ -6762,13 +6762,6 @@ packages:
       # https://github.com/commercialhaskell/stackage/issues/6395
       - wuss < 2.0
 
-      # https://github.com/commercialhaskell/stackage/issues/6396
-      # https://github.com/commercialhaskell/stackage/issues/6397
-      # https://github.com/commercialhaskell/stackage/issues/6398
-      - pandoc < 2.17
-      - texmath < 0.12.4
-      - ipynb < 0.2
-
       # https://github.com/haskell-game/sdl2/issues/240 (need newer Ubuntu)
       - sdl2 < 2.5.3.1