diff --git a/rlp.cabal b/rlp.cabal
index 5d3fa6a..39d6379 100644
--- a/rlp.cabal
+++ b/rlp.cabal
@@ -48,19 +48,24 @@ library
     -- other-extensions:
     build-depends:    base ^>=4.18.0.0
                     -- required for happy
-                    , array
-                    , data-default-class
-                    , data-default
-                    , unordered-containers
-                    , hashable
-                    , pretty
-                    -- TODO: either learn recursion-schemes, or stop depending
-                    -- on it.
-                    , recursion-schemes
-                    , megaparsec                ^>=9.6.0
-                    , text
-                    , data-fix
-                    , utf8-string
+                    , array >= 0.5.5 && < 0.6
+                    , containers >= 0.6.7 && < 0.7
+                    , template-haskell >= 2.20.0 && < 2.21
+                    , pretty >= 1.1.3 && < 1.2
+                    , data-default >= 0.7.1 && < 0.8
+                    , data-default-class >= 0.1.2 && < 0.2
+                    , hashable >= 1.4.3 && < 1.5
+                    , mtl >= 2.3.1 && < 2.4
+                    , text >= 2.0.2 && < 2.1
+                    , megaparsec >= 9.6.1 && < 9.7
+                    , microlens >= 0.4.13 && < 0.5
+                    , microlens-mtl >= 0.2.0 && < 0.3
+                    , microlens-platform >= 0.4.3 && < 0.5
+                    , microlens-th >= 0.4.3 && < 0.5
+                    , unordered-containers >= 0.2.20 && < 0.3
+                    , recursion-schemes >= 5.2.2 && < 5.3
+                    , data-fix >= 0.3.2 && < 0.4
+                    , utf8-string >= 1.0.2 && < 1.1
 
     hs-source-dirs:   src
     default-language: GHC2021