diff --git a/portfolio-haskell.cabal b/portfolio-haskell.cabal
index e701545..0e5c2a4 100644
--- a/portfolio-haskell.cabal
+++ b/portfolio-haskell.cabal
@@ -68,7 +68,9 @@ executable portfolio-haskell
     -- other-extensions:
 
     -- Other library packages from which modules are imported.
-    build-depends:    base ^>=4.17.2.1
+    build-depends:    base ^>=4.17.2.1 && <5
+                    , scotty >= 0.22 && < 0.23
+                    , text
 
     -- Directories containing source files.
     hs-source-dirs:   app