diff --git a/appveyor.yml b/appveyor.yml
index 2b3ec1ed..08c3f531 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -48,7 +48,7 @@ install:
   # Upgrade to the latest version of pip to avoid it displaying warnings
   # about it being out of date.
   - "python -m pip install --disable-pip-version-check --user --upgrade pip"
-  - "python -m pip install --no-use-pep517 pyinstaller==3.4"
+  - "python -m pip install --no-use-pep517 pyinstaller==3.6"
 
   # Set up the project in develop mode. If some dependencies contain
   # compiled extensions and are not provided as pre-built wheel packages,
diff --git a/contrib/tx.spec b/contrib/tx.spec
index b743f1ba..20bc06be 100644
--- a/contrib/tx.spec
+++ b/contrib/tx.spec
@@ -26,4 +26,4 @@ exe = EXE(pyz,
           debug=False,
           strip=None,
           upx=False,
-          console=True , icon='contrib/tx.ico')
+          console=True , icon='tx.ico')
diff --git a/requirements.txt b/requirements.txt
index c125f3cb..49551d64 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 urllib3>=1.24.2,<2.0.0
 six<2.0.0
 requests>=2.19.1,<3.0.0
-python-slugify<2.0.0
+python-slugify<5.0.0
 gitpython<4.0.0