diff --git a/pkgs/servers/calibre-web/default.nix b/pkgs/servers/calibre-web/default.nix
index 240aae229deb..ef322524ca92 100644
--- a/pkgs/servers/calibre-web/default.nix
+++ b/pkgs/servers/calibre-web/default.nix
@@ -7,22 +7,20 @@
 
 python3.pkgs.buildPythonApplication rec {
   pname = "calibre-web";
-  version = "0.6.11";
+  version = "0.6.12";
 
   src = fetchFromGitHub {
     owner = "janeczku";
     repo = "calibre-web";
     rev = version;
-    sha256 = "10sjllhhcamswpa1wlim4mbm2zl4g804bwly5p4nmklg7n1v226g";
+    sha256 = "sha256-IgS281qDxG302UznC63nZH8/ty4fgFtn+lLYdakGA4w=";
   };
 
   prePatch = ''
     substituteInPlace setup.cfg \
-        --replace "singledispatch>=3.4.0.0,<3.5.0.0" "" \
         --replace "requests>=2.11.1,<2.25.0" "requests>=2.11.1,<2.26.0" \
-        --replace "unidecode>=0.04.19,<1.2.0" "unidecode>=0.04.19" \
         --replace "cps = calibreweb:main" "calibre-web = calibreweb:main" \
-        --replace "Babel>=1.3, <2.9" "Babel>=1.3, <=2.9"
+        --replace "PyPDF3>=1.0.0,<1.0.4" "PyPDF3>=1.0.0"
   '';
 
   patches = [
@@ -54,7 +52,7 @@ python3.pkgs.buildPythonApplication rec {
     flask_login
     flask_principal
     iso-639
-    pypdf2
+    pypdf3
     requests
     sqlalchemy
     tornado