diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+1.5.0.3
+-------
+* Relaxed upper version bound for `transformers`.
+
 1.5.0.2
 -------
 * Relaxed upper version bound for OpenGLRaw.
diff --git a/GLURaw.cabal b/GLURaw.cabal
--- a/GLURaw.cabal
+++ b/GLURaw.cabal
@@ -1,5 +1,5 @@
 name: GLURaw
-version: 1.5.0.2
+version: 1.5.0.3
 synopsis: A raw binding for the OpenGL graphics system
 description:
   GLURaw is a raw Haskell binding for the GLU 1.3 OpenGL utility library. It is
@@ -45,7 +45,7 @@
   hs-source-dirs: src
   build-depends:
     base         >= 4   && < 5,
-    transformers >= 0.2 && < 0.5,
+    transformers >= 0.2 && < 0.6,
     OpenGLRaw    >= 2.4 && < 2.7
   default-language: Haskell2010
   ghc-options: -Wall