diff --git a/.gitignore b/.gitignore
index 76a066e..8f2c2d4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -68,3 +68,4 @@
 /ocrmypdf-13.0.0.tar.gz
 /ocrmypdf-13.2.0.tar.gz
 /ocrmypdf-13.3.0.tar.gz
+/ocrmypdf-13.4.0.tar.gz
diff --git a/ocrmypdf.spec b/ocrmypdf.spec
index 0db3094..18622d5 100644
--- a/ocrmypdf.spec
+++ b/ocrmypdf.spec
@@ -1,7 +1,7 @@
 %global srcname ocrmypdf
 
 Name:           %{srcname}
-Version:        13.3.0
+Version:        13.4.0
 Release:        %autorelease
 Summary:        Add an OCR text layer to scanned PDF files
 
@@ -75,7 +75,7 @@ done
 %pyproject_wheel
 
 # generate html docs
-PYTHONPATH=${PWD}/build/lib OCRMYPDF_VERSION="%{version}" sphinx-build-3 docs html
+PYTHONPATH="%{pyproject_build_lib}" OCRMYPDF_VERSION="%{version}" sphinx-build-3 docs html
 # remove the sphinx-build leftovers
 rm -rf html/.{doctrees,buildinfo}
 
@@ -94,7 +94,9 @@ install -Dpm 0755 misc/webservice.py %{buildroot}%{_bindir}/%{srcname}-webservic
 
 
 %check
-%{pytest} -ra -n auto --runslow
+%{pytest} -ra -n auto --runslow -k 'not test_tesseract_config_invalid'
+# For some reason these break and 'work' when run in parallel.
+%{pytest} -ra --runslow -k 'test_tesseract_config_invalid'
 
 
 %files -n %{srcname} -f %{pyproject_files}
diff --git a/sources b/sources
index 947fa46..7d921f0 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (ocrmypdf-13.3.0.tar.gz) = 055d28ed49cdfaacf79c20fbad9237e2964272bacb4c52b28a6386584e66494f64072cf478f8a9ce579e9e379ba1dd45a806d87c9cef940f2390b2bf7aa73c10
+SHA512 (ocrmypdf-13.4.0.tar.gz) = 8498b14c240bd58d4d759259b18e95e34fe5cf1158cb717d4a5814fae735c724fd227a4eadfdebc6aacb5f6a2d8d9a47291bb5e2b27f838a69040071ad5dcb14