diff --git a/CHANGELOG.md b/CHANGELOG.md
index e932d4a6e..bac7c65fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -76,12 +76,13 @@ To release a new version, please update the changelog as followed:
 ### Changed
 - remove `tl.layers.initialize_global_variables(sess)` (PR #931)
 - change `tl.layers.core`, `tl.models.core` (PR #966)
-   - change `weights` into `all_weights`, `trainable_weights`, `nontrainable_weights`
+- change `weights` into `all_weights`, `trainable_weights`, `nontrainable_weights`
 
 ### Dependencies Update
 - nltk>=3.3,<3.4 => nltk>=3.3,<3.5 (PR #892)
 - pytest>=3.6,<3.11 => pytest>=3.6,<4.1 (PR #889)
 - yapf>=0.22,<0.25 => yapf==0.25.0 (PR #896)
+- imageio==2.5.0 progressbar2==3.39.3  scikit-learn==0.21.0 scikit-image==0.15.0 scipy==1.2.1 wrapt==1.11.1 pymongo==3.8.0 sphinx==2.0.1 wrapt==1.11.1 opencv-python==4.1.0.25 requests==2.21.0 tqdm==4.31.1	lxml==4.3.3 pycodestyle==2.5.0 sphinx==2.0.1 yapf==0.27.0(PR #967)
 
 ### Deprecated
 
diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index 6dde449b1..2f1ac7f15 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -1,10 +1,10 @@
-imageio>=2.3,<2.5
+imageio==2.5.0
 numpy>=1.16,<1.17
-progressbar2>=3.38,<3.39
+progressbar2==3.39.3
 requests==2.21.0
-scikit-learn>=0.19,<0.21
-scikit-image>=0.14,<0.15
-scipy>=1.1,<1.2
-wrapt>=1.10,<1.11
+scikit-learn==0.21.0
+scikit-image==0.15.0
+scipy==1.2.1
+wrapt==1.11.1
 h5py>=2.9
 cloudpickle>=0.8.1
diff --git a/requirements/requirements_db.txt b/requirements/requirements_db.txt
index 98a7f59d9..76796f646 100644
--- a/requirements/requirements_db.txt
+++ b/requirements/requirements_db.txt
@@ -1 +1 @@
-pymongo>=3.6,<3.8
+pymongo==3.8.0
diff --git a/requirements/requirements_doc.txt b/requirements/requirements_doc.txt
index 448ee00dd..ab6b176f4 100644
--- a/requirements/requirements_doc.txt
+++ b/requirements/requirements_doc.txt
@@ -1,8 +1,8 @@
 flake8-docstrings>=1.3,<1.4
-pycodestyle>=2.0,<2.5
+pycodestyle==2.5.0
 pydocstyle>=2.1,<3.1
-sphinx>=1.7,<1.9
+sphinx==2.0.1
 sphinx_rtd_theme>=0.4,<0.5
-wrapt>=1.10,<1.11
+wrapt==1.11.1
 h5py>=2.9
 cloudpickle>=0.8.1
diff --git a/requirements/requirements_extra.txt b/requirements/requirements_extra.txt
index a5385002b..f1ab51761 100644
--- a/requirements/requirements_extra.txt
+++ b/requirements/requirements_extra.txt
@@ -1,6 +1,6 @@
-opencv-python>=3.4,<3.5
+opencv-python==4.1.0.25
 nltk>=3.3,<3.5
 matplotlib>=2.2,<3.1
-requests>=2.19,<2.21
-tqdm>=4.23,<4.29
-lxml>=4.2,<4.3
+requests==2.21.0
+tqdm==4.31.1
+lxml==4.3.3
diff --git a/requirements/requirements_test.txt b/requirements/requirements_test.txt
index 081a7095f..a6b027a03 100644
--- a/requirements/requirements_test.txt
+++ b/requirements/requirements_test.txt
@@ -1,9 +1,9 @@
 keras>=2.2,<2.3
-pycodestyle>=2.0,<2.5
+pycodestyle==2.5.0
 pydocstyle>=2.1,<3.1
-pytest>=3.6,<4.1
+pytest==4.5.0
 pytest-cache>=1.0,<1.1
-pytest-cov>=2.5,<2.7
-pytest-xdist==1.25.0
-sphinx>=1.7,<1.9
-yapf==0.25.0
+pytest-cov==2.7.1
+pytest-xdist==1.28.0
+sphinx==2.0.1
+yapf==0.27.0