diff --git a/.github/workflows/release_linux.yml b/.github/workflows/release_linux.yml
index 19a36bb..b3665ed 100644
--- a/.github/workflows/release_linux.yml
+++ b/.github/workflows/release_linux.yml
@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - v*
+  workflow_dispatch:
 
 jobs:
   release:
@@ -19,7 +20,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip setuptools
         pip install -r requirements.txt
-        pip install PyInstaller==4.3
+        pip install PyInstaller==4.5.1
     - name: Build binary
       run: |
         pyinstaller --onefile -n nanovna-saver nanovna-saver.py
diff --git a/.github/workflows/release_macos.yml b/.github/workflows/release_macos.yml
index 5c9cc6b..83a5976 100644
--- a/.github/workflows/release_macos.yml
+++ b/.github/workflows/release_macos.yml
@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - v*
+  workflow_dispatch:
 
 jobs:
   release:
@@ -19,7 +20,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip setuptools
         pip install -r requirements.txt
-        pip install PyInstaller==4.3
+        pip install PyInstaller==4.5.1
     - name: Build binary
       run: |
         pyinstaller --onefile -n nanovna-saver nanovna-saver.py
diff --git a/.github/workflows/release_win.yml b/.github/workflows/release_win.yml
index c506172..9afffd9 100644
--- a/.github/workflows/release_win.yml
+++ b/.github/workflows/release_win.yml
@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - v*
+  workflow_dispatch:
 
 jobs:
   release:
@@ -23,7 +24,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip setuptools
         pip install -r requirements.txt
-        pip install PyInstaller==4.3
+        pip install PyInstaller==4.5.1
     - name: Build binary
       run: |
         pyinstaller --onefile -n nanovna-saver.exe nanovna-saver.py
diff --git a/requirements.txt b/requirements.txt
index 1cf3ea0..1c49ba0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-scipy
-cython
-pyqt5
-pyserial
-numpy
+pyserial==3.5
+PyQt5==5.15.4
+numpy==1.21.1
+scipy==1.7.1
+cython==0.29.24
diff --git a/setup.cfg b/setup.cfg
index 4c3e929..646e60b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -15,11 +15,11 @@ version = attr: NanoVNASaver.About.VERSION
 [options]
 packages = find_namespace:
 install_requires=
-    pyserial
-    PyQt5
-    numpy
-    scipy
-    cython
+    pyserial==3.5
+    PyQt5==5.15.4
+    numpy==1.21.1
+    scipy==1.7.1
+    cython==0.29.24
 python_requires = >=3.8, <4
 
 [options.entry_points]