diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+2.13.2.1
+--------
+* Relaxed upper version bound for `transformers`.
+
 2.13.2.0
 --------
 * Implement Uniform instances for `GLint`, `GLuint`, `GLfloat`, and `GLdouble`.
diff --git a/OpenGL.cabal b/OpenGL.cabal
--- a/OpenGL.cabal
+++ b/OpenGL.cabal
@@ -1,5 +1,5 @@
 name: OpenGL
-version: 2.13.2.0
+version: 2.13.2.1
 synopsis: A binding for the OpenGL graphics system
 description:
   A Haskell binding for the OpenGL graphics system (GL, version 4.5) and its
@@ -152,7 +152,7 @@
     bytestring   >= 0.9   && < 0.11,
     containers   >= 0.3   && < 0.6,
     text         >= 0.1   && < 1.3,
-    transformers >= 0.2   && < 0.5,
+    transformers >= 0.2   && < 0.6,
     ObjectName   >= 1.1   && < 1.2,
     StateVar     >= 1.1   && < 1.2,
     OpenGLRaw    >= 2.6.1 && < 2.7,